SEPIOPHORA. 41 



Genus FIDENAS, Gray. 



Head attached to the back of the mantle by a broad 

 cervical band. Fms short, in the middle of the sides of 

 the back. Cups of sessile arms very longly peduncled. 



Shell narrow, with a central and two marginal ribs. 



Ex. F. Penares, Gray, pi. 5, fig. 1. 



This genus has been established by Mr. Gray on a 

 specimen in spirits in the British Museum. The long 

 peduncles of the cup-like suckers, which peduncles are 

 suddenly contracted and very thin near the cups, serve 

 principally to distinguish it from Se;piola ; it is from 

 Singapore. 



Sub-order SEPIOPHORA. 



Head united to the mantle by a broad cervical baud. 

 Mantle attached behind, free in front, and with two in- 

 ternal cartilaginous longitudinal ridges fitting into carti- 

 laginous grooves at the base of the sides of the siphuncle. 

 Fins as long as the sides of the back. 



Shell cellular, calcareous ; back hard ; cavity filled with 

 laminae separated by numerous cells. 



This sub-order comprises the Cuttles properly so called ; 

 they live near the shore, and the mucro of their shell 

 seems to protect them in the frequent collisions they are 

 exposed to in swimming backwards. 



Fam. SEPHD^. 



Eyes covered with skin. Head united to the mantle 

 by a broad cervical band. Mantle with two cartilaginous 

 ridges on the ventral side. 



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