LOLIGIDiE : GONATUS. 67 



c. Shell elongate, broad. Animal ? Fossil. 



5. Teudopsis. Shell pennate, very broad below, narrow above. 



6. Leptoteuthis. Shell lanceolate, very broad above, acumi- 



nate below. 



7. Beloteuthis. Shell oblong, dilated and winged behind, acu- 



minated above. 



8. Belemnosepia. Shell broad, central part dilated and pro- 



duced in front, winged behind. 



d. Shell shorter than the Back. Fin short, on the middle of the 



Sides of the Back. 



9. Rossia. 



B. Head attached to the Back of the Mantle by a broad cervical 

 Band. Fin short, in the middle of the Sides of the Back. Shell 

 narrow, with a central and two marginal Ribs. 



10. Sepiola. Cups of sessile arms nearly sessile. 



11. Fidenas. Cups of sessile arms very longly peduncled. 



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



pennate. 



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



1. GONATUS. 



Body cylindrical, acute behind. Fins posterior, rhombic, connate 

 behind, separate in front, elongated, linear. Ventral part of 

 mantle with two interior marginal ridges, fitting into grooves on 

 the base of the siphuncle, and a dorsal ridge and groove. — Head 

 cylindrical ; buccal membrane rounded, not lobed, without any 

 cups. Eyes large, covered with the skin, with a small trans- 

 parent spot; no eyelid. — Sessile arms curved, rounded exter- 

 nally ; cups small, conical, contracted at the top, nearly uniform 

 in size, in four series, all with small circular rings. Tentacular 

 arms cylindrical, flattened internally and granular on the edges ; 

 club small, compressed, and finned at the tip, external ; with 

 ranges of small, nearly sessile, equal-sized cups (more numerous 

 near the base), and with a large sessile cup armed with a hook in 

 the middle of the lower part. — Siphuncle short, conical, without 

 superior central band, and no interior valve. — Shell horny, thin, 

 lanceolate, pennate, narrowed and extended in front, which is 

 slightly margined on the sides. 



Onycotheutis sp. Moller, Moll. Green, 3. 1842. 



Moller describes the tentacular arms with cups to the base ; 

 this is not the case, but each side of the flattened inner surface is 



