438 c. 0. SARS, 



angular, cousiderably narrowed distally, and cleft only in its posterior half. 

 Length 8 mm. 



Remarks. — Though very nearly allied to G. tuber ciilata, this form 

 may at once be distiuguislied by the peculiar development of the lateral 

 prominences of the head, the increased number of the dorsal expansions, and 

 the triangular form of the latter. Moreover, the gnathopoda appear less un- 

 equal, and the telson is of a very different shape. 



Description. — The length of the solitary specimen examined, which 

 seems to be of female sex, is 8 mm., or about the same as in the preceding 

 species. 



The form of the body (see fig. 20) resembles that of G. tubercitlata, 

 though being, perhaps, still shorter and stouter, with the back very much 

 curved, and very distinctly carinated in its posterior part. 



The cephalon (fig. 22) somewhat exceeds in length the 1st segment of 

 the mesosome, and has the lateral lobes very small and obtusangular. On 

 the other hand, the lateral protuberances are greatly developed, forming a 

 pair of spiniform i)rojections extending obliquely forwards, and looking, if 

 the head is viewed from above (fig. 21) like a pair of pointed ears, — hence 

 the specific name. 



The lateral tubercles of the mesosome are somewhat less prominent than 

 in the preceding species, though distinct on all the segments of this division. 

 On the other hand, the dorsal expansions are more pronounced, and present 

 on the 2 last segments of the mesosome and those of the metasome, being 

 accordingly 5 in number, whereas in G. tuberculata only 4 such expansions 

 are found. Of these expansions, the hindmost is rounded, the other 4 pronoun- 

 cedly triangular in form. 



The urosome is very short and stout, and exhibits dorsally, at the end of 

 each segment, a few small hairs. Moreover, on each side of the last segment, 

 at the base of the telson, occurs (see fig. 23) a small denticle not found in 

 the preceding species. 



The anterior pairs of coxal plates exhibit a similar form to that in the 

 preceding species, but are somewhat less deep. 



The 2 i)Osterior pairs of epimeral plates of the metasome appear nearly 

 rectangular. 



The eyes (see fig. 22) resemble in form and size those in G. tuberculata, 

 and, as in that species, are placed close to the anterior edges of the cephalon. 



The superior antennae (ibid.) scarcely equal in length '/, of the body, 

 and have the flagellum somewhat shorter than the peduncle and composed 

 of only 10 articulations. The accessory appendage, as in G. tuberculata, is 

 extremely small and biarticulate. 



*B3.-MaT. .!Tp. 268. l8 



V 



