1.22 Zoological Society. feet at Lecropt Church, about 900 feet at Airthrey Mineral Well, and nearly half a mile at Airthrey Castle. Several openings have been cut in it by streams or other agents. The preservation of this por-tion of the ancient sea-bottom may be attributed to the high trap hill of Abbey Crag at its east end, which had protected it from the action of the tide when the sea covered the Carse. A remnant of another terrace at a corresponding level is found at the opposite side of the Carse, two miles southward, near Whitehouse Farm, and small portions of a terrace fifty feet lower are found at Stirling Castle and near Causeyhead. January 6, 1845. — 1. " Further Remarks on the Electrical Organs of the Rays." By Dr. Stark. 2. " Observations on the same subject." By John Goodsir, Esq. Mr. Goodsir stated that he had examined the part described by Dr. Stark. It was, as he had suspected, the posterior part of the middle mass of the caudal muscles. The texture of this part differs remarkably from the muscular ; it consists of numerous compart-ments formed by the aponeurotic septa of the muscle. Each com-partment contains next its walls a rich festooned arrangement of nervous loops, these loops being generally united three by three ; the sling of each loop is enlarged and contains one or more nu-cleated corpuscules, the limbs passing back into nervous tubes of the usual size. With these nervous loops, blood-vessel loops simi-larly enlarged are intermixed. The centre of each compartment con-tains a gelatinous mass applied externally to the nervous loops, and in its interior containing a vacant space. The gelatinous mass con-sists of areolae formed by bars passing in all directions : these bars are thickest where they meet one another : they consist of a series of nucleated cells, which are plump and gelatinous in appearance, and much larger at the points of junction of the bars. These larger cells Mr. Goodsir considers as the germinal spots of the texture. The bars, and consequently the whole arrangement of the gelatinous mass, appear to be covered by a membrane presenting a most re-markable appearance, — a series of grooves or lines, the general di-rection of which is parallel to the bars, but generally slightly in-clined. These grooves resemble the grooves or lines of mother-of-pearl, or the groovings on the dermal plates of some of the older fossil fishes. Mr. Goodsir concluded by stating that this organ had the general appearance of an electrical organ, but that the evidence educed of its electrical properties appeared to him to be insufficient. ZOOLOGICAL SOCIETY. June 11, 1844. — George Gulliver, Esq., in the Chair. " On the Blood-corpuscles of the Two-toed Sloth, Bradypus didac-tylus, Linn.," by George Gulliver, F.R.S. From an obsei-vation which I have lately made, it results that the Two-toed Sloth is one of the very few animals that has blood-discs
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