THE ANNALS AND MAGAZINE OF NATURAL HISTORY. [FOUKTH SERIES.] " per litora spargite museum, Naiades, et circiim vitreos conaidite fontes: Pollice virgineo teneros hio carpite flores : Ploribus et pictiun, divaa, replete caniatrum. At T08, o Nymphse Craterides, ite sub undas; Ite, recurvato variata eorallii trunco Vellite muscosis e rupibus, et mihi conchas Ferte, Deaa pelagi, et pingui conchylia succo." If. Parthenii Giannet/aiii Eel. 1. No. 37. JANUARY 1871. I. — A DescriiJtive Account of three Pachytragous Sponges growing on the Rocks of the South Coast of Devon. By H. J. Carter, F.R.S. &c. [Plate IV.] The term applied by Aristotle to those compact sponges which were " very hard and rough," and grew upon the rocks near the shore, was rpdyoi,. Hence the term " pachytragous " in the title of this communication — a word which I should not have introduced had there been any other previously employed to designate generally the order to which the three sponges about to be described belong. Under the head of " Pachytragife " I would include for the present all the " Corticatte " of Dr. Oscar Schmidt (Die Spong. Adi-iat. Meeres, 1862, p. 81) and all those designated Te-thyad£e and Sphajrospongia respectively by Dr. Gray (" Notes on the Arrangement of Sponges," Proc. Zool. Soc. Lond. 1867, p. 540 &c.). It may be questioned hereafter how far the chondroid species of which Tethya lyncurium is a type, together with its repent or incrusting allies, should not be grouped together with Schmidt's Chondrilla nucula, &c. ; but as regards the term " Sphffirospongia," of which Pachymatisma Johnstonia is the first example in Dr. Gray's " Notes," recent observations on the habitat of this sponge seem undoubtedly to point out the necessity of its suppression altogether. Ann. ds Mag. N. Hist. Ser. 4. Fb?. vii. 1
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