68 THE VOYAGE OF H.M.S. CHALLENGER. 



15. Campylaspis nodulosa, n. sp. (PL XL). 



Specific Characters. — % . Carapace scarcely attaining half the length of the body ; 

 posterior part not produced over the anterior segments of trunk; dorsal surface evenly 

 vaulted in the posterior part and obliquely declining anteriorly ; pseudorostral pro- 

 jection rather produced ; subrostral notches distinctly defined. Surface of carapace 

 everywhere provided with rounded nodiform protuberances. Ocular lobe oval. Pen- 

 ultimate caudal segment subdivided by a transverse sulcus. First pair of maxillje 

 with the palp bisetose ; second pair with eight setae. Terminal joint of second pair 

 of legs scarcely longer than carpal joint. Uropoda comparatively short, about half as 

 long as the tail, scape rather strong, slightly serrate on both edges ; inner branch only 

 slightly shorter than scape, serrate on inner edge, and armed with five spines, two 

 lateral and three apical ; outer branch a little shorter than inner, with two unecpal 

 setse at the tip. Length, nearly 5 mm. 



Remarks. — Of the earlier known species the Norwegian form, Campylaspis 

 verrucosa, G. 0. Sars, would seem to be the one most nearly related to the present 

 species, at least as regards the sculpture of the carapace. In other respects, however, 

 the two species are very easily distinguishable from each other. 



Description. — I have had for examination four specimens of this form, all of exactly 

 the same size, and having the general appearance of females. But in all specimens the 

 last pair of legs are quite wanting, a fact that would seem to prove the specimens to be 

 still immature, although their size is not inferior to that of adult specimens of other 

 species, and considerably larger than that of the form described above, which un- 

 doubtedly is full-grown. In dissecting one of the specimens, I have found all the 

 remaining limbs well developed and of a structure very similar to that in adult 

 specimens of other species. The length of the specimens is nearly 5 mm. 



The form of the body (see PI. XL figs. 1, 2) is that characteristic of the genus, the 

 anterior division being greatly dilated and somewhat longer than the posterior. 



The integuments, as in other species, are very strongly indurated and exhibit on 

 the several limbs a more or less pronounced squamous structure. 



The carapace is very large, though not nearly attaining the enormous development 

 of the preceding species. In a lateral view (fig. 1) it exhibits a somewhat ii-regular 

 oval form, with the dorsal line forming a bold curve rather abruptly declining anteriorly. 

 The pseudorostral projection is somewhat more produced than in the preceding species, 

 and the notch beneath it deeper and limited below by a distinctly projecting process. 

 The inferior edges of the carapace are evenly curved in their anterior part, whereas the 

 posterior part is slightly sinuous and obliquely ascending. The posterior edge is almost 

 perpendicularly truncate and joins the inferior without forming any distinct angle. 

 As seen from above (fig. 2) the carapace exhibits a rather regular oviform shape, the 



