SUBCLASS II 



DIBRANCHIATA 



685 



addition to the eight arms, two long tentacles ivithout hooka are placed between the third 

 and fourth pairs. Oligocene to Recent. 



Vo- 



Fig. 13-20. 



A, PhragmoteiUhis hiainiiata 

 (Bronn). Trias ; Raibl, Car- 

 iutliia. I'll, Pliragmacone ; I'o, 

 Proostractuii ; L, Lateral area 

 of proostracum ; </, Ink-bag. 

 B, Hooklets of arms, i/i (after 

 Suess). 



■<i<.A ..r 



B 



Fig. 1327. 



U clc m note nth i s ft n t i q u a 

 Pearce. Oxford Clay ; Chris- 

 tian Malford, Wilts. .1 , Partly 

 restored specimen, i/.j. oo. 

 Eyes ; m, Mantle. Other 

 letters as in Fig. 132i;. B, 

 Hooklet, -i/i (after Mantell). 



Fig. 132S. 



Belemnoteuthis sp. Oxford Clay ; Gam- 

 melshausen, Wtirtemberg. A, C, Dorsal 

 and ventral aspects. B, Septum and 

 siphuncle. 



B 



■-- Ph 



Fig. 1320. 



Spindirostra hellardU (Mich.). Mio- 

 cene ; Siiperga, near Turin, Italy. .1, 

 Side view. J!, Longitudinal section. /', 

 Guard ; Ph, Pliragmacone. i/'i (after 

 Munier-Chalmas). 



Spirulirostra d'Orb. (Fig. 1329). Shell composed of a 

 short triangular pointed guard, which is excavated anteriorly 

 for the reception of the chambered phragmacone. The latter 

 begins as a spiral, but speedily becomes straight, and has 

 septa pierced on the concave ventral side by the marginal 

 siphuncle. Only one species. Oligocene of Westphalia and 

 Upper Miocene of Turin. 



Sfirnlirostrina Canavari. Like the preceding, but guard 

 reduced to two small, lateral wing-like appendages. Neocene 

 of Sardinia. 



Spirula Lam. (Fig. 1330). Shell thin, guard wanting. 

 Chambered phragmacone enrolled with the ventral side 

 concave, the coils not in contact, composed of nacreous sub- 

 stance ; septa concave ; protoconch globular. Siphuncle tocon'ch" 

 ventral and marginal in position, the septal necks directed ^^^X^! sfS^^ 

 backwards between the septa. Prosiphon present. Recent ; (after Munier-Chalmas). 



Fig. 1330. 



Spirula pernnii Lam. 

 Recent ; Pacific. Longi- 

 tudinal section, i/i. a, Pro- 

 e, Caecal com- 



