324 Mr. C. Spence Bate on the Development of the Cirripedia, 115. O.jutlandicum, Brid. i. p. 296. O. phyllanthum, B. et S. Common on trees. Genus 10. Encalypta, Schreb. 116. E. vulgaris, Hedw. On the Downs at Halnaker near Chichester, and on the north wall of St. Nicholas Church, Brighton, Mr. Borrer. On a wall at Stor-rington, and on a wall between Cocking and Midhurst. 117. E. streptocarpa, Hedw. In many places on the Downs r at Newthnher ; Arundel Park ; Offhamnear Lewes ; and on tiles near Hurstpierpoint : always barren. [To be continued.] XXVI. — On the Development of the Cirripedia. By C. Spence Bate. [With three Plates.] Few animals belonging to the European fauna, so very abundant on our shores as the Cirripedia, have had their nature so misun-derstood, and so long veiled in mystery. The happy discovery of Mr. J. V. Thomson, so far back as 1826, approximated some-what to a revelation of their real history ; and the later researches of Burmeister, in his Beitrage zur Naturgeschichte der Ranken-fusser, together with those of Prof. Goodsir, in the Edinburgh New Phil. Journal, July 1843, have further elucidated this inter-esting inquiry. Although as yet the chain of development be-tween the ovum and the perfect animal has not been success-fully observed, the hiatus is not so great but that naturalists are enabled to identify the position of these creatures in the animal kingdom. Feeling a little curiosity in relation to the subject, and wishing to verify for myself the observations of Mr. Thomson, I took ad-vantage of my residing near the shore where two or three distinct species are common, and have occupied myself a little this sum-mer in endeavouring to observe the animal, as well as the changes through which the larva passes until it assumes the form and characters of the parent. Being desirous to obtain the young, so as to identify it with the species which are the parent of each, I adopted the mode of breaking off the Balanus from the rocks and obtaining the embryo in a mature state before it had left the ovum, and of then hatching it ; which was readily accomplished upon its being plunged into sea-water, — a mode which I found
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