80 Bibliographical Notices. 



of our readers, the names of those genera only which are regarded as 

 t]/pes of families, and omitting nearly all the subdivisional names. 



Class I. Cephalopoda : Order Octopoda ; Octopus, Philonexis, 

 Argonauta. 



Order Decapoda ; Cranchia, Loligopsis, Chiroteuthis, Onycho- 

 teuthis, Loligo, Sepia, Spirula. 



Order Polypoda ; Nautilus, 



Class II. Pteropoda : Order Thecosomata ; Hyalea, Cuvieria, 

 Cymbulia, Limacina. 



Order Gy^nnosomata ; Clio, Pneumodermon, Cymodocea. 



Class III. Gasteropoda: Order Pectinibranchiata (A. Prohos- 

 cidifera) ; Murex, Pleurotoma, Triton, Buccinum, Oliva, Fasciolaria, 

 Turbinella, Voluta, Mitra, Marginella, Dolium, Pyrula, Velutina, 

 Lamellaria, Natica, Cassis, Scalaria, Terebra, Pyramidella, Eulima, 

 Stylifer, Cerithiopsis, Solarium. 



(B. Toxifera.) Conus. 



(C. Rosfrfera.) Strombus, Cyprsea, Ovulum, Pedicularia, Cancel- 

 laria, Trichotropis, Aporrliais, Cerithium, Melania, Littoriua, Plan- 

 axis, Jeffreysia, llissoa, Paludina, Valvata, Ampullaria, Turritella, 

 Csecum, Vermetus, Phorus, Calyptrsea, Pileopsis, Narica. 



Order Scutibranchiata ; Nerita, Trochus, Hahotis, Fissurella, Den- 

 talium, Acmsea, Gadinia, Patella, Chiton. 



Order Tectibranchiata ; Tornatella, Aplustrum, Cylichua, Bulla, 

 Philine, Icarus, Aplysia, Pleurobranchus, Ruucina, Pleurophyllidia, 

 Phylhdia. 



Order Nudibranchiata ; Doris, Oncidoris, Triopa, Tritonia, Proc- 

 tonotus, ^olis, Hermsea, Elysia, Limapontia. 



Subclass Heteropoda; lanthina, Macgillivrayia, Atlanta, Firola, 

 Phyllirhoa, Pterosoma. 



Subclass Pulmonifera : (A. Inopercvlata ;) Glandina, Testa- 

 cella. Helix, Limax, Stenopus, Arion, Janella, Vaginulus, Oncidium, 

 Auricula, Limnsea, Amphibola, Siphonaria. 



(B. Operculata ;) Cyclophorus, Helicina, Truncatella, Assiiuinia. 



In the first class, Cephalopoda, we see with regret, that the phi- 

 losophical arrangement and terminology proposed by Prof. Owen has 

 been abandoned for a new and emjiirical scheme, burthened with 

 such frivolous terms as " Chondrophora," and " Sepiophora," &c. 

 The great tetra-branchiate order is termed " Polypoda," although 

 that phrase was employed by Gistel for the whole of the Cuttlefishes, 

 and is most appropriate to the Octopods — the Polypi of the ancients. 

 It is not contended that the law of priority applies to names of 

 higher than generic importance, — they are formed by rule ; and in 

 the other classes the names of the Orders are founded on branchial 

 characters. 



The first, and most important division of the Gasteropoda, pre- 

 sents a remarkable scene of confusion, as if the Families had been 

 thrown out of a dice-box. Pleurotoma is at the commencement, Conus 

 (in a separate suborder) at the end ; Fasciolaria is separate from Fusus, 

 and Dolium from Cassis. The shells called "Nassaria" are certainly 



