MOLLUSCA. 225 



asceudens ; apertura linearis in canali brevi effuso desinens ; columella valde 

 arcuata, superne callosa ; labiuin extermim acutuin ; umbilicus parvus. 

 Epidermis Isevis. C. serotinus. Marquesas. 



Hinds describes (Proceed, p. 47) ten new Cancellar'ue : C. ventricosa, 

 urceolata, all'ula, cremata, corrugata, elata, funiculata, all from the west 

 coast of America, bicolor, from Macassar, lamellosa, from various parts 

 of the Indian Ocean, antiquata, from New Guinea. 



Pom at obran cliia. Recluz describes, in the ' Rev. Zool./ 

 Ovula triticea, Blainv., as Bulla Blainvilleana. Atlantic 

 Ocean. 



Nudibranchia. Alder and Hancock have described a 

 new British Calliopcea, C. dendritica (Annals, xii, p. 233), 

 where they also give four new species of Eolis : E. stipata, 

 pellucida, curta, and concinna, all British. 



The sjnne authors have published their observations on 

 the development of Eolis, Melibtsa, and Tritonia, which have 

 an immediate connexion with those of Sars. The develop- 

 ment of the ova requires about fourteen days. They ob- 

 served in Eolis a system of vessels in connexion with the 

 alimentary canal, similar to that discovered by Milne Edwards 

 in Calliopasa, except that there were not two longitudinal 

 vessels, but only one, which sends branches to the papillae. 

 "Within the extremity of each papilla is an ovate vesicle, 

 which is connected to the central tube by means of a trans- 

 parent vessel. By the contraction of this vesicle minute 

 bodies are occasionally expelled from the extremity of the 

 papilla. The auditory organs also were observed. The 

 authors, like Blainville, look upon the dorsal tentacles as 

 an olfactory organ. 



De Quatrefages read, at the Academic de Paris, the 

 description of a new Mollusc, Eolidina paradoxa, which 

 would in many points appear to form a transition to the 

 Annulata. A more particular description must be awaited 

 (Comptes rendus, vol. xvi, p. 1123) with reference to this; 

 vide observations by Alder and Hancock. (Annals xii, p. 

 238.) 



Aspidobranchia. Haliotis scabricosta, Menke, with scaly 



15 



