512 LOLIGINID^. 



tremity, and furnished with two series of suckers, the eight are 

 almost equal and provided throughout their whole length with two 

 ranges of suckers ; the arms are long, and with the head they meas- 

 ure two thirds of the length of the sac ; the bone is very narrow in 

 the middle, dilated at each extremity, and terminated at the inferi- 

 ority by a hollow inverted cone. 



Colors vivid and beautiful, passing from a brilliant red to a deep 

 and clear blue, upon the back, the head, arms, tail, and fin, which 

 are covered with deeper points of the same color, tlie under part of 

 the body is paler, region of the eyes finely tinted with yellow. 



This species is known by the name of Squid at Sandy Bay, and 

 is made use of hw the fishermen as bait in the cod-fishery. (Le- 

 sueur.} 



Onunastrephes Bartramii. 



Plate XXV., fig. 330, drawn by Mr. Burkhardt from a specimen 

 in the Aquarial Gardens at Boston, is referred to this species. 



Family LOLIGINID^. 



Eyes covered with skin, simple. Mantle with three internal car- 

 tilages, one dorsal and two ventral. 

 Shell solid, horny. 



In this family the fins are on the sides of the hinder part of tlie 

 back ; the eyes are without eyelids and covered with the skin ; the 

 buccal membrane is often furnished with cups ; the ears have a 

 transverse ridge ; the sessile arms have two rows of cups, the rings 

 provided with a narrow, prominent ridge on the centre of the exter- 

 nal surface ; the tentacular arms are only partly contractile into the 

 sub-ocular cavity, and the siphuncle is attached to the head by a 

 double superior medial band. 



Genus LOLIGO, Lamarck. ISOL 



Head separate from the body. Mantle free all around. Cups of 

 sessile arms in two rows ; lateral membranes with cups on the an- 

 gles. Fins posterior, dorsal, rhombic. 



Shell as long as the back, pennate, edges thin. 



