14 



Mr. Cumiiig, were exliibited. The abstract of tiiis Paper, in- 

 cluding the characters of tlie new species, vvill be given on the 

 completion of the reading of it. 



Mr. Owen read a Paper "On the Anatomy of the Calyptr(pidce." 

 After referring to the account given by Cuvier of the auatomy of 

 Crepidula, to that by M. Deshayes of Calj/ptrcca, and to M. Lessop's 

 of Crepipalella, as elucidating the general plan of organization in 

 this family, he proceeds to describe the structure of Calypeopsis. 



The anatomy of this genus agrees very nearly vvith that of the 

 before-knovvn genera of the family, scarcely differing, except in the 

 comparative extent of the iocomotive and respiratory systems; but 

 Mr. Owen has been enabled to add to the labours of his predeces- 

 sors an account of the tęstis, and a desci iption of the salivary giands. 

 The tęstis is lodged in a membranous chamber, and consists of a 

 glandular part of a light brown colour, and of a fibrous texture v\heii 

 seen under the lens; though, from analogy, the apparent fibres are 

 no doubt seminal tubes. By the side of tiie tęstis there is a bag, or 

 vesicula seminalis, appropriated to receive the secretion, which 

 communicates with the termination of the oviduct posterior to the 

 anns; the aniis being situated on the right side of the branchial 

 orifice, anterior to the tęstis, vviiich here separates it from the ovi- 

 duct. Betvveen the tęstis and the process on the right side of the 

 neck (regarded by Cuvier as the penis,) Mr. Ovven has been unable 

 to tracc any conimunication: he feels, consequently, convinced 

 that if this process forms part of the malė generative system, it is to 

 be regarded rather as an exciting than an introniittent organ. 

 The salivary apparatus consists of two elongated follicles with 

 glandular yjanVics, occupying the neck on either side of the ceso- 

 phagus, anterior to the nervous collar, and opening into the cesopha' 

 gus on each side of the base of the lingual plate. 



After passing in revievv the several systems, Mr. Owen concludes 

 by remarking on the internal cliamber or cup which exists in the 

 shells of this family. He regards it as being necessitated by the 

 greater extent of the Iocomotive [)owers in Calyptrcea than in Fa- 

 te/la; a calcareous plate being interposed between the viscera and 

 the foot to protect them from the pressure to which they vvould 

 otherwise be exposed during the comparatively extensive and fre- 

 quent contractions of the latter organ. As respiration has a direct 

 relation to locomotion, the CahjptrceidcE aĮ)proach tovvards the 

 higher marine univalves in the organs dedicated to that function. 

 Throughout the family the extent of the respiratory lamina is found 

 to correspond vvith the extent of the internal shell, and with the 

 extent and organization of the foot. 



Numerous specimens were exhibited of Birds collected in North 

 America, principally in the United States, by George Folliott, Esq., 

 and prescnted by him to the Society. At the request of the Chair- 

 nian, Mr. Gould brought them scverally under the notice of the 

 Mecliug. His principai objett being to illustrate, so far as these 



