200 CONNICCTICUT GEOL. AND NAT. HIST. SURVICY. 



Hull. 



very small and triangular. Succeeding legs more slender than 

 second and third ; and with carpus longer than in preceding legs, 

 ambulatory. 



First six abdominal segments fused to resemble an eighth 

 thoracic segment which is a little longer than the seventh; in- 

 dications of the fusion of the first five visible along the sides. 

 Telson depressed at a steep angle, narrow^, elongate, and rounded 

 posteriorly, sides nearly parallel, ciliated near the tip. 



First pair of pleopods composed of a short quadrate peduncle 

 and tvi^o rami of which the outer one acts as an operculum, oval 

 in form with inner margin nearly straight ; inner ramus much 

 smaller than outer, slender, with nearly parallel sides, rounded 

 at tip and not ciliated. Uropods with elongated peduncle ex- 

 tending two-thirds the length of the telson and obliquely truncated 

 distally where it articulates with the short, rounded inner ramus, 

 which is half as long as the peduncle and is setose on its outer 

 and apical margins ; outer ramus lying directly on dorsal surface 

 of telson, extending as far as peduncle, triangular and narrow, 

 with acute apex, setose along its free superior margin. 



Length 20 mm. 



This species occurs from the surface to depths of 19^/2 

 fathoms on shelly and muddy bottoms, among eel-grass and 

 algse. Most abundant between tides or just below low water. 



Distribution : Greenland ; Denmark ; also Gloucester, Massa- 

 chusetts ; Vineyard Sound ; Providence, Rhode Island ; off Block 

 Island; Noank Harbor, Connecticut; Long Island Sound; Great 

 Egg Harbor., New Jersey ; Norfolk, Virginia. 



This species is distinguished by the nearly complete union 

 of the anterior segments of the abdomen which have together 

 the appearance of an eighth thoracic segment. 



Ptilanthura tenuis, Harger. 



1878. Ptilanthura tenuis, Harger, Amer. Jour. Sci., ser. 3, 

 vol. 15, p. 378. 



1880. Ptilanthura tenuis, Harger, Rep. U. S. Com. Fish, 

 for 1878-9, p. 406, pis. II and 12, figs. 71-74. 



Body extremely narrow and elongate. Head as broad as 

 long, with anterior margin produced into a small, median, tri- 

 angular process. Eyes small, round, distinct, situated within the 

 margin of the head. 



