REPORT ON THE CUMACEA. 61 



moderate length and deeply excavated above, being bordered on eacli side by an elevated 

 crest, which is continued along the sides of the anterior part of the carapace. These 

 crests are somewhat flexuous and strongly dentate in their anterior part, some of the 

 denticles being considerably larger than the rest, and the two anterior occupying the tip 

 of the pseudorostral projection. The inferior edges of the carapace are strongly arcuate 

 in the middle, and finely serrate along their anterior half. As seen from above (fig. 2), 

 the carapace appears very tumid, the greatest breadth occurring a little posterior to 

 the middle, and distinctly exceeding the height. The surface is evenly vaulted, and 

 everywhere minutely scabrous from numerous very small microscopic spikes. The eye 

 seems to be quite wanting, though the rounded ocular lobe is distinctly seen at the end 

 of the bell-shaped frontal lobe (see fig. 2). 



The exposed segments of the trunk are rather sharply marked off from each other, 

 their dorsal part being more or less elevated. The anterior edge of the two first 

 segments is very finely denticulate. The antepenultimate segment has a slight 

 transverse keel above, armed with a few small denticles, and on the dorsal surface of 

 the penultimate segment two short longitudinal serrate keels occur. The last segment 

 is very small and provided with a pair of dorsal denticles. The epimeral plates of the 

 four anterior segments are evenly rounded and finely denticulate ; those of the last 

 segment are obtusely produced posteriorly. 



The tail is very slender, and about as long as the anterior division of the body. It 

 is quite smooth, with the exception of a pair of small dorsal denticles occurring on each 

 of the three anterior segments. 



The first pair of legs (see fig. 1) are of moderate length, with the basal joint strongly 

 spinous, the three outer joints rather slender and slightly decreasing in length. 



The second pair of legs have also the basal joint densely armed with spines and 

 seem on the whole to agree in form with those of the preceding species. 



The three posterior pairs of legs are very slender, with the meral and carpal joints 

 subequal. 



The telson (see fig. 3) about equals in length the two last caudal segments taken 

 together. Its basal part is regularly cylindrical ; the terminal part, projecting beyond 

 the anal orifice, is nearly of the same length, and gradually tapers to the apex, which 

 bears the two usual spines. Of lateral spines there are in the sj^ecimen examined only 

 a single pair at a short distance from the apex, besides a very minute denticle occurring 

 on the left side immediately in front of the lateral spine. 



. Theuropoda (ibid.) are not very large, scarcely exceeding the length of the three 

 posterior caudal segments taken together. The scape does not nearly attain the length 

 of the telson, and wants every trace of denticles on the inner edge. The branches are 

 rather unequal in size, the inner one being considerably shorter than the outer, and 

 about half as long as the scape. This branch is composed of but two joints of about 



