﻿19S 



columba, 



medurensis, 



nemocanus, 



cancellatus, 



fusiformis, 



cosrulescens, 



aurora, 



Taitensis, 



Adansonii, 



Tinianus, 



Portoricanus, 



crocatus, 



amabilis, 



OinaBicus, 



nobilis, 



C. aurisiacus, 

 ' terminus, 

 ' striatus, 

 ' gubernator, 

 ' granulatus, 

 * terebra, 

 ' verulosus, 

 ' raphanus, 

 ' magus, 

 ' spectrum, 

 ' bullatus, 

 ' cervus, 



4 stercus-muscarum, 

 ' Timorensis, 

 ' nimbosus, 



C. 



dux, 



tendineus, 



prsefectus, 



melancholicus, 



strigatus, 



glans, 



mitratus, 



nussatella, 



aulicus, 



auratus, 



colubrinus, 



clavus, 



auricomus, 



omaria, 



C. rubiginosus, 

 ' pennaceus, 

 ' pra?latus, 

 ' panniculus, 

 ' arcbiepiscopus, 

 ' canonicus, 

 ' episcopus, 

 ' legatus, 

 ' textile, 

 J pyramidalis, 

 ' gloria maris, 

 ' australis, 

 ' orbignyi, (n. s.) 



9 fossil species. 



ORDER IV. CEPHALOPODA. 



This order is separated into three divisions, viz. Polythalamous Cephalo- 

 poda, Monothalamous Cephalopoda, and Naked Cephalopoda. 



DIVISION I. POLYTHALAMOUS CEPHALOPODA. 



Shell multilocular, completely or partially enveloped, situated on the poste- 

 rior part of the body of the animal, often adhering. 



This division contains seven families, — Orthocerata, Litnolata, Cristata, 

 Sphserulata, Radiolata, Nautilacea, and Ammoneata. 



I. Shell multilocular, the septa simple, not showing any divided sinuous sutures 

 on the internal surface of the shell. 



ORTHOCERATA.— Fivf Genera. 



Shell straight, or nearly so; not spiral. 



Belemnites. Shell straight, an elongated cone, formed of two distinct 

 and separable parts. The external sheath solid, full at the upper part, with 

 a conical cavity; the internal, a conical nucleus, pointed, chambered trans- 

 versely through its whole length, multilocular; the chambers perforated by a 

 syphon in the centre. 



1 fossil species. 



Orthocera. Shell straight or slightly arched, subcorneal, striated on the 



