SIIIZOPOD.E. 57 



Description of Cynthia. 



Corselet as in the Shrimps, slightly pointed in front. 



Ahdominal portion of seven joints. 



Tail of five scales ; outer ones ohlong, obliquely truncated, 

 truncation and inner edge serrate and ciliatc, with a 

 strong spine at the outer angle ; intermediate scales taper, 

 serrated, ciliated on their outer edge, inner edge with alter- 

 nate long and short spines ; middle scale slightly taper, 

 truncated at the end or very slightly indented, serrate and 

 spinous on its outer edges, the spines lengthened towards 

 its end where they appear almost clustered. 



Eyes remarkably large. 



Antennce two pair; the inner antennsB of three remark- 

 ably robust basil joints, surmounted each by a pair of 

 pi uri- articulate setae of which the outermost are the 

 longest, at the inside of the last basil joint is a taper sessile 

 appendage very strongly ciliated and analogous to the brush 

 of the male Mysis ; inner antennae of two basil joints ending 

 in a shorter pluri-articulate seta, slightly hairy, the scale 

 at its base, oblong, obliquely truncated, with a short spine 

 at the outer angle of the truncation^ and serrated and 

 ciliated along its inner edge. 



Thoracic members eight pairs, divided to the Coxae into 

 two parts ; the outer divisions being pluri-articulate, and 

 feathered towards their extreme, and bearing the Branchia 

 at their base ; the inner divisions, independent of a basis 

 resembling the branchia of the outer ones, are composed of 

 about five joints, which in the six posterior, bear a 

 strong terminal curved claw, the two anterior resembling 

 considerably the same members in the genus Mysis. 



Mouthy not dissected ; the Palpi in their two last joints 

 appear to approximate to the same organs in Mysis. 



Suh-ahdominal Jins, already sufficiently described. 



The appendage to the Male organs in situation and struc- 

 ture shews also an approximation to the same part in Mysis, 

 and ends in three curved hooks. 



