REPORT ON THE CUMACEA. 67 



the body, and being produced posteriorly so as to arch over nearly the whole exposed 

 part of the trunk. The dorsal surface is boldly arched, with the strongest curvature 

 occurring in the posterior part, whence the dorsal line declines quite gradually anteriorly, 

 and more abruptly posteriorly. The pseudorostral projection is very short and obliquely 

 truncated, with the upper corner slightly projecting ; beneath it, on each side, occurs a 

 distinct though rather shallow sinus, limited below by an obtuse angle. The inferior 

 edges of the carapace are quite unarmed and rather curved in the middle, their posterior 

 part ascending obliquely and without any angle joining the posterior edge, which is 

 also oblique. The surface of the carapace wants any trace of keels or distinct pro- 

 tuberances, but appears somewhat uneven in the dorsal part ; it exhibits under the 

 microscope a finely granular structure produced by numerous small depressed pits. 

 The ocular lobe is rather broad and contains within it an accumulation of whitish eye- 

 pigment, whereas distinctly developed refracting bodies seem to be quite wanting. 



The exposed part of the trunk is very short, and is to a great extent hidden by 

 the posterior projecting part of the carapace. It seems to be composed, as in the other 

 species, of five segments, but only the three posterior segments appear quite distinct 

 in their whole circumference. The epimeral plates of all the segments are evenly 

 rounded and slightly projecting laterally. 



The tail is rather slender, with the segments sharply marked off from each other 

 and provided with a slight lateral keel. They increase successively in length to the 

 penultimate, which is the longest. The last segment is considerably shorter, and pro- 

 duced at the end to an obtuse angle. 



The colour of the freshly mounted specimen is a uniform brownish-red. 



As to the limbs of the anterior division, a closer examination could not of course 

 be made in the sole specimen before us. They, however, seem to agree fairly well with 

 those in the succeeding species, as described below. 



The uropoda are rather elongate, about equalling in length the four posterior caudal 

 segments taken together. The scape is very slender, more than twice as long as the 

 branches, and quite smooth. The inner branch is composed, as in the other species of 

 the genus, of a simple segment, armed on the inner edge with a few denticles, and at 

 the tip with a strong spine. The outer branch is distinctly biarticulate, but consider- 

 ably smaller than the inner, and provided at the tip with a slender seta. 



Habitat. — The above described specimen was taken by the late Dr. v. Willemoes 

 Suhm, at the surface of the sea, on October 27, 1874, off Samboangan, Philippine 

 Islands, and was mounted together with the specimens of Nannastacus suhmii on the 

 same glass-slide. 



