REPORT ON THE SCHIZOPODA. 47 



specimen, a male, reaches a length of 59 mm. I have selected a male for anatomical 

 dissection, and have figured the limbs, gills, and the nervous system separately 

 on PI. VIII., hoping in this way to illustrate more closely the organisation of the 

 genus. 



The form of the body (see PI. VII. figs. 1, 2), although rather similar to that in 

 Gnatliophausia zoea, would appear on the whole to be somewhat more slender, the 

 anterior division being less tumid. 



The carapace, as in that species, covers the whole of the trunk, without, however, 

 overlapping the anterior part of the first caudal segment. The dorsal spine is strongly 

 developed, projecting, when the tail is extended, to about the end of its fourth segment. 

 It is closely denticulate throughout, the denticles being present not only, as in Gnatlio- 

 phausia zoea, along the lateral, but also on the dorsal edges, and continued forward, 

 moreover, along the dorsal keel of the carapace almost to the verge of the dorsal area. 

 The lateral keels of the carapace are comparatively shorter than in Gnathophausia 

 zoea, but, in other respects, exhibit a perfectly similar appearance. The rostrum is 

 exceedingly elongate and slender, even attaining twice the length of the carapace, and 

 it is perfectly straight, acuminate, and coarsely denticulate throughout. The supra- 

 orbital spines (fig. 5, a), as in Gnathophausia zoea, are strongly developed, pro- 

 jecting far beyond the eyes. On the other hand, the antenna! spines would seem to 

 be wholly wanting, only a very small rounded prominence (6) being observed in their 

 place. The lateral expansions of the carapace, too, project into a strong, acutely 

 triangular lappet, pointing straight outward, and apparently corresponding to the 

 branch iostegal spines. 



The five anterior caudal segments are, as in Gnathophausia zoea, slightly keeled 

 above, and exhibit in the middle of the posterior margin a small dorsal projection 

 pointing backward. The epimera project distinctly, the posterior lappet being drawn out 

 into a sharp point, which, on the second segment, is remarkably long and slender. The 

 epimeral plates issuing from the anterior section of the last segment exhibit two small 

 denticles succeeding each other. The terminal spines, placed on each side of the base of 

 the telson, are unusually strong and somewhat upturned. 



The eyes, as in Gnathophausia zoea, are rather short and clavate in form. 



The antennal scale (PI. VII. fig. 3), on the other hand, exhibits a rather char- 

 acteristic appearance. It is very large, and tapers rapidly toward the apex, the 

 terminal lobe being very much narrowed and lanceolate in form. The spine, too, issuing 

 from the outer corner, is enormously developed, decidedly mucroniform, and projects far 

 beyond the tip of the scale; it is also coarsely denticulate on both edges, the denticles, 

 moreover, being continued backward along the outer margin of the scale, almost to 

 its base. 



The telson (fig. 4) does not differ materially from that of Gnathophausia zoea, nor do 



