u 



-Mr. Cuming, were exhibited. Tiie abstract of this Paper, in- 

 cluding the characters of the new species, will be given on the 

 completion of the reading of it. 



Mr. Owen read a Paper "On the Anatomy of the Calj/pfrmdce." 

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

 Crepidida, to that by M. Deshayes o^ Calijptrcea, and to M. Lesson's 

 of Crepipatella, as elucidating the general plan of organization in 

 this family, he proceeds to describe the structure of Cal^peop^is. 



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

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

 comparative extent of the locomotive and respiratory systems ; but 

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

 sors an account of the testis, and a description of the salivary glands. 

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

 glandular part of a light brown colour, and of a fibrous texture when 

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

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

 vesicula seminalis, appropriated to receive the secretion, which 

 communicates with the termination of the oviduct posterior to the 

 anjis ; the anus being situated on the right side of the branchial 

 orifice, anterior to the testis, which here separates it from the ovi- 

 duct. Between the testis and the process on the right side of the 

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

 to trace any communication: he feels, consequently, convinced 

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

 be regarded rather as an exciting than an inlromittent organ. 

 The salivary apparatus consists of two elongated follicles with 

 g\anA\\\&r parietes, occupying the neck on either side of the ceso- 

 phagus, anterior to the nervous collar, and opening into the oesopha- 

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



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

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

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

 greater extent of the locomotive powers in Calyptrcea than in Pa- 

 tella; a calcareous plate being interposed between the viscera and 

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

 otherwise be exposed during the comparatively extensive and fre- 

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

 relation to locomotion, the CalyptnBidcs approach towards the 

 higher marine univalves in the organs dedicated to that function. 

 Throughout the family the extent of the respiratory lamina is found 

 to correspond with 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 Follioft, Esq., 

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

 man, Mr. Gould brought them severally under the notice of the 

 Meeting. His principal object being to illustrate, so far us these 



