REPORT ON THE SCHIZOPODA. 143 



said to have been discovered by that lamented naturalist, I have deemed it advisable to 

 associate his name with this form, although he was clearly misled in regarding it as a 

 male Eupliausia. The species may be at once distinguished from Stylocheiron cannatum 

 by the more elongate carapace, lacking, as it does, any distinct dorsal crest, by the much 

 smaller eyes, the very slender antennulaj, and a somewhat different structure of the 

 second pair of legs. 



Description. — Only three specimens of this form are in the collection, the largest of 

 which, a female, measures 8 mm. in length. The latter, apparently the same specimen 

 examined by the late Dr. v. Willemocs-Suhm, has been treated with carmine and 

 mounted in Canada balsam on a glass slide. The two other specimens, one of which 

 was a male, were more or less defective, and also of smaller size. 



The form of the body (see PI. XXVII. fig. 1) is rather short, and exhibits between 

 the anterior and posterior divisions a projDortion somewhat different from that in the 

 preceding species, the tail being relatively far less elongate. 



The carapace appears comparatively larger than in Stylocheiron carinatum, as also 

 somewhat narrowed anteriorly, and without any distinct crest, being but very slightly 

 keeled along the middle of the anterior part. The rostral projection is shorter, and 

 flattened at the base, terminating in a sharp point, that does not nearly reach to the 

 middle of the basal joint of the antennulge. 



The caudal segments rapidly diminish in height and breadth posteriorly, and are 

 furnished with distinct, though not very large, rounded epimera. The last segment is 

 comparatively short, very little, if at all, longer than the preceding, and would seem to 

 lack the preanal spine. 



The eyes (see fig. 1), as in Stylocheiron carinatum, are irregularly pj-riform, but 

 relatively much smaller, with the cornea exceedingly narrowed in its u^^per part, form- 

 ing here (see fig. 4), as it were, a mammillar j)rojection containing a number of densely 

 crowded visual elements. 



The antennidar peduncle, in the female (see fig. 1), is remarkably elongate and slender, 

 almost ec[ualling the carapace in length, and has the last joint somewhat longer than 

 the second. In the male this part (fig. 4) is relatively less slender, with the outer 

 joints subequal and cylindrical in form. Of the flagella the inner one only is complete 

 in the female specimen ; it has nearly the length of the peduncle, and is very slender, 

 with six rather elongate articulations. 



The anteunal scale (fig. 2) is rather elongate, projecting considerably beyond the 

 second joint of the antennular peduncle, and, in the male (fig. 4), reaching nearly to the 

 tip of the peduncle. It is exceedingly narrow, linear, though slightly expanding toward 

 the apex, which is very oblicpely truncate, with the inner corner greatly projecting and 

 the outer having a well-defined tooth. The flngellum is remarkably elongate and 

 slender, exceeding even the length of the body, and has the peduncle extending far 



