REPORT ON THE SCHIZOPODA. 45 



The carapace is very large, covering the whole of tlie trunk, and even pomewhat 

 overlapping the anterior part of the first caudal segment. It juts out posteriorly into a 

 remarkably strong dorsal spine of somewhat varying length, but in some specimens 

 projects, when the tail is extended, even beyond its fourth segment. This spine, too, is 

 rather broad at the base, and gradually tapers toward the apex, which is sharply 

 pointed. Both lateral keels of the carapace are distinctly marked, the lower one being 

 placed rather far down, and, as in Gnathopkausia willemoesii, curving abruptly upward 

 at a short distance from the infero-posterior corners of the carapace, running parallel to the 

 posterior margin, and joining the upper lateral keel at the base of the dorsal spine. The 

 upper part of the posterior margin of the carapace is armed with strong denticles, 

 resembling the teeth of a saw, and these are continued for some distance along the 

 Ititeral edges of the dorsal sjiine. The dorsal keel is quite uninterrupted, running along 

 the whole dorsal surface of the carapace, and continued anteriorly on the rostrum, 

 posteriorly on the dorsal spine. The rostrum attains a very considerable size, even 

 exceeding in length the whole carapace, if the dorsal spine be excepted, and is distinctly 

 denticulate throughout. The supra-orbital spines (fig. 8, a) are strongly developed, 

 and project far beyond the eyes. The anteunal spines (h) also attain a comparatively 

 considerable length. On the other hand, the branchiostegal spines are wholly wanting, 

 the lateral expansions of the carapace (c) being evenly rounded off", as in (rnathopha^tsia 

 ■willemoesii and Gnathophausia elegans. 



The five anterior caudal segments are slightly keeled above, and, at the posterior 

 margin, produced as short posteriorly directed spines. The epimera project rather 

 more than in the two species last described, tlieir posterior lappet being acutely 

 pointed. 



The eyes, as in the other species belonging to this section, are rather short, and 

 pyriform in shape. 



The antennal scale (fig. 9) has much the same form as in Gnathophausia elegans, 

 differing only in the spine of the outer corner being slightly serrate along the 

 outer edge. 



The telson (see fig. 10) also exhibits a very similai' appearance to that in the 

 preceding species, but the apical spines are here connected by a thin but distinct lamella, 

 regularly serrate on its free edge. 



The uropoda {ibid.) do not quite reach the apex of the telson, and are, in other 

 respects, very similar in structure to those of the other species belonging to this section. 



Colour. — According to the statements of Dr. v. Willemoes-Suhm, the Rev. Dr. Norman. 

 Professor A. Milne-Edwards, and the Marquis de Folin, the colour of this form is a 

 magnificent blood-red or carmine. 



Habitat. — The specimens procured by the Challenger Expedition were collected at 

 the following localities : — 



