66 H. Mollusca. 



kenneu ; dieselbe imterscheidet sich von den Dibranchiaten durch den Besitz einer 

 auBeren Schale nnd die Abwesenheit des Dintensacks , gleicht ihnen aber durch 

 den Besitz eines Siphonalcaecums in der Anfangskamnier ; von den Tetrabran- 

 chiaten imterscheidet sie sich durch den Besitz dieses Caecums und durch die 

 Aptychen. Verf. kommt zu folgendem Schema: 

 I. Dibranchiata. 



Octopoda. a. Monocotylea (Cirroteuthidae, Eledonidae). b. Polycotylea 



^Octopidae, Tremoctopidae, Argonautidae) . 



Decapoda. a. Chondroplora. \ . Oigopsidae (Cranchiidae, Chiroteuthidae, 

 Thysanoteuthidae , Onychoteuthidae , Ommastrephidae) . 2. Miopsidae 

 (Sepiolidae, Sepiadariidae. Idiosepiidae, Loliginidae) . b. Sepiophora (Se- 

 piidae). c. Phmymophora (Belosepiidae , Belopteridae , Belemnitidae, 

 Spirulidae) . 

 II. Ammonea. 



Retrosiphonata (Goniatidae) . Prosiphonata. a. Anaptychidae. 

 1 . Latisellata (Arcestidae, Tropitidae, Ceratitidae, Clydonitidae) . 2. An- 

 gustisellata (Pinacoceratidae , Amaltheidae , Ammonitidae , Lytocera- 

 tidae). b. Aptychidae (Harpoceratidae, Stephanoceratidae) . 

 III. Tetrabranchiata. 



Prosiphonata (Nothoceratidae) . Retrosiphonata (Nautilidae, Asco- 



ceratidae) . 



Die Zungenbewaffnung von Octopus Maorum und Omamastrephes Sloani von 

 Neu-Seeland bildet Hutton ( 127 ) Taf. 6 ab. 



I. Dibranchiata. 



A. Octopoda. 

 Octopida'e. 



Octopus (Lam.) piscatorum Venill zum ersten Male abgebildet Verrill ( 237 ), T. 36. 

 F. 1, 2 obestts n; id., T. 36. F. 3 - - pictus n. Mittelmeer ; Brock ( 42 j, p. 603, 

 T. 37. F. 3. 



Tremoctopidae. 



Tremoctopus (delle Ch.) violaceus n. Messina; Brock ( 42 ), p. 601, T. 37. F. 1, 2. 



B. Decapoda. 



Chiroteuthidae. 



Brackioteuthis u. g. Allied to Chiroteuthis. Differs in having the lateral connective 

 cartilages of the siphon simple, long-ovate, and the corresponding cartilages of 

 the mantle in the form of simple, linear ridges ; a rhombic caudal fin ; pen with 

 a simple, linear, anterior portion, which is naturally infolded ; arms slender, the 

 ventral ones not distinctly obliquely compressed ; tentacular club without a spoon- 

 like cavity. The siphon has a valve and dorsal bridle, as in ChiroteutMs , and 

 the suckers, so far as preserved, are similar, but those of the club are more numer- 

 ous and their pedicels apparently had a less prominent bulb below the sucker ; 

 Verrill ( 2:i7 ), p. 105 - - Beam; id., p. 406, T. 55. F. 3, T. 56. F. 2. 



Chiloteuthis n. g. Allied to Enoploteutkis, Lestoteuthis und Abralia, but with a more 

 complicated armature than either of these genera. Sessile arms with sharp in- 

 curved claws, arranged in four rows on the ventral arms, and in two rows on the 

 other arms. Tentacular arms long, with broad clubs, strongly keeled externally, 

 and with series of connective suckers and tubercles extending for some distance 

 along the inner surface of the arms. Tentacular club provided with a marginal 



