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180 



STALK-EYED CRUSTACEA 



Sicyonia picta Eax. 



Plate XL VI., Fig. 2-2". 



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Bull. Mus. Comp. Zool, XXIV. 2i0, 1893. 



Rostrum a little shorter than the eye-stalks, laterally compressed, ele- 

 vated, armed with six teeth, three superior, throe terminal ; inferior margin 

 ciliated. Carapace carinate in the median dorsal line; the carina is furnished 

 with two teeth, one minute one on the anterior part of the gastric region at 

 the base of the rostrum, the other larger, over the cardiac region. An infra- 

 orbital and an hepatic spine ai'e present. General surface of carapace punc- 

 tate, and sparsely clothed with seta). Abdominal segments smooth, with a 

 median dorsal carina, which rises into a strong tooth on the first segment, 



directed upward and forward; on the fifth and sixth segments the carina is 

 drawn out into an acute tooth, which is directed horizontally backward. 

 The pleurae of the abdominal segments are margined, and armed with a 

 tooth on the lower border : on the second, third, and fourth segments the 

 tooth is hamnlate, being directed outward and backward. The general sur- 

 face of the abdomen is smooth, with a transverse groove on each side of 

 each segment. The telson is channeled above, acute at the tip, and armed 

 with a pair of small lateral spines near the distal end. 



The eyes are very large, horizontally flattened. 



Basal segment of antennule armed with two spines on its exterior 

 border. Flagella shorter than the peduncle. 



The peduncle of the second antenna reaches about two thirds of the way 

 to the end of the scale. The flagellum is about equal to the abdomen in 



The basal segment of the peduncle is furnished with a long and 

 acute external spine. 



The sternum is armed with a long spine between the bases of the second, 

 third, and fourth pair of legs, as is usual in species of this genus. 



The last pair of abdominal appendages are a little shorter than the 

 telson. 



Length, 70 nmi. ; carapace, 24 mm. 

 Station 3355. 182 fathoms. 1 male. 



length. 



a 



3387. 127 



a 



6 males, 4 fern. 



On the hinder part of each branchial region there is a dark (in alcohol) 

 ring of pigment. S. ocellala Stimpson and S. pcnidlhta Lockington are 

 similarly ornamented. The flagellum of the antenna is banded alternately 



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