0F CUTTLE FISH. 89 



A careful examination of all the species which 

 exist in the cabinets, and which, from the general 

 form of the body, are regarded as the same, would 

 prove that many distinct kinds have been associated 

 under one specific denomination. 



Thus I regarded the species described in this 

 paper, from the collection of the academy, and that 

 from the Philadelphia Museum, as specifically the 

 same, with one of which I made a drawing at Sandy- 

 bay ; but upon comparing them with each * other, 

 they all proved distinct. 



In the following arrangement I have considered 

 the form of the body, the number of the arms and 

 their armature. To the family I apply the name of 

 Loligoidea, of which the genera may be divided into 

 those which have not long arms ; and those which 

 have long arms, and finally, those which have simple 

 nails ; those which have nails and suckers ; and 

 those which have suckers only. 



family LOLIGOIDEA. 



Characters. — Body enclosed in a sac, which is 

 elongated, narrow, cylindrical, subulate posteriorly ; 

 fins terminal, united or separate ; bone very thin, 

 more or less transparent, sometimes partially gelati- 

 nous; arms as in the Sepia, with or without long arms. 



* Arms sub-equal. 



genus 1st, LEACHIA. 

 Eight unequal arms, the third pair longer and 

 more robust. 



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