66 CATALOGUE OF CEPHALOPODA. 



Omm. Munsterii B'Orb. Paleont. univ. t. 24. f. 3. 1845, Moll. 



Viv. et Fos. i. 417. 

 Fos. Lithographic slate, Solenhoffen. 



Intermediate between Ommastrephes and Geoteuthis. 



h. Eyes covered iviih the Skin. 



Fam. V. LOLIGID^E. 



Body subcylindrical, oblong, rounded behind. Fins on the sides of 



the hinder part of the back. 

 Head subcylindrical. Eye without eyelid, covered by the skin, 



simple above. Buccal membrane distinct, often furnished with 



cups. Ears with a transverse ridge. 

 Sessile arms with two rows of cups. Rings not convex externally, 



and provided with a narrow prominent edge on the middle of 



their width. Tentacular arms only partly contractile into the 



subocular cavity. 

 Siphuncle attached to the head by a double superior medial band. 

 Shell internal, horny, lanceolate, pennate or spathulate, without 



any air cells. 



Loligidaj Gray, Proc. Zool. Soc. 1847, 285. 

 Loligidae (pars) D'Ork. Moll. Viv. et Fos. i. 318. 

 Teuthidse 11. (pars) Owen, Trans. Zool. Soc. ii. 1836. 



A. Head separate from the Body. Mantle free all round. Shell 



pennate. 



a. Shell as long as Back. Fin posterior, dorsal, rhombic. 



1. Gonatus. Cups of sessile arms in four rows. Tentacular 



arms with many rows of small cups, and a single hooked cup 

 at the base. Shell pennate, edges thin. 



2. Loligo. Cups of sessile arms in two rows ; lateral membranes 



with cups on angles. Shell pennate, edge thin. 



3. Teuthis. Cups of sessile arms in two rows ; lateral membranes 



without cups. Shell pennate, edges thin. 



b. Shell as long as Back. Fin occupying the Sides of the Body. 



4. Sepioteuthis. Shell pennate, broad ; edge sometimes thick- 



ened. 



