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PROCEEDINGS OF THE NATIONAL MUSEUM 



carapace at base of rostrum. Carapace and abdomen smooth, 

 polished, and unarmed. Fifth and sixth abdominal somites subequal 

 in length. Telson (fig. 7,6) about 1.15 times as long as sixth somite, 

 armed dorsally with two pairs of spines and, distally, with two pairs 

 of spines and three pairs of plumose setae, as well as about a dozen 

 long, simple setae du-ected upward and backward from the posterior 

 margin. The telson of the male paratype from Bogombogo Island is 

 obviously aberrant in that it lacks the anterior dorsal spine on the 



Figure 6. — Thalassocaris crinila (Dana): a, First pleopod of male in posterior view, X 25.3; 

 h, endopod of first pleopod of male in anterior view, X 25.3; c, endopod of second pleopod 

 of male in anterior view, X 25.3. 



right side and has two smaller additional spines (one marginal and one 

 submarginal) on that side between the posterior dorsal tooth and the 

 posterior margin. 



Antennular peduncle (fig. 7,c) with penultimate more than twice as 

 long as distal segment and not quite 2K times as long as wide; tip of 

 stylocerite reaching slightly beyond distal margin of proximal seg- 

 ment; inner antennular flagellum somewhat longer than carapace and 

 first abdominal somite; outer flagellum with the first 12 or 13 segments 

 swollen. Antenna] scale (fig. 7 ,d) reaching to distal fourth or fifth of 

 penultimate antennular segment. Antenna! peduncle slightly over- 



