llliPOltT ON THE SL'IlIZurODA. 4J> 



to work]]out the sjjecifii; character.^ satisfactorily, as also to give correct figures of tlie 

 general appearance and form of the body. The specimen has not a trac^e of incubatory 

 lamelLie, and hence is most likely a male. Its length is only 41 mm. 



The form of the body (figs. 6, 7), as compared with the other species of the genus, 

 is very slender, for which reason the late Dr. v. Willemoes-Suhm suggested the specific 

 <lenomination "gracilis." 



The carapace is comparatively small, and does not seem to cover completely the last 

 segment of the trunk, it projects ^posteriorly into a well marked, although rather short, 

 dorsal spine, scarcely reaching beyond the first caudal segment. The infero-})osterioi- 

 corners of the carapace, instead of being rounded off", as in the species belonging to the 

 second section, are somewhat prominent, and jut out into two posteriorly directed spines, 

 of somewhat unequal length, the lower rather short, whereas the upper attains about the 

 length of the dorsal spine. Of the lateral keels, the lower only is distinctly developed, 

 and it runs parallel to the inferior margin of the carapace, terminating at the base of the 

 upper spine, which issues from the infero-posterior corner. Of the upper lateral keels, on 

 the other hand, no trace whatever can l)e discerned. The dorsal keel is interrupted in 

 the anterior part of the carapace, where a distinct transverse impression is seen to occur, 

 apparently corresponding to the cervical sulcus in other Schizopoda. In the posterior 

 part, however, the keel is well marked, and armed witli a row of strong, anteriorly 

 curving denticles. The rostrum is i-ather elongate and slender, about as long as the 

 carapace, and, as in the other species, three-edged, being also armed with strong denticles, 

 continued along the dorsal edge to some distance posterior to the base of the rostrum. 

 The supra-orbital spines are very small, and not distinctly defined from the base of the 

 rostrum, being placed somewhat anterior to the insertion of the eyes. The antennal 

 spines are well marked, though not very large. On the other hand, the branchiostegai 

 spines are enormously developed, and project on either side as strong wing-like expansions, 

 tapering to a sharp point. 



The caudal segments are rather slender, and the five anterior ones are armed with 

 dorsal projections, those on the two foremost being distinguished by their exceedingly 

 large size. On the second segment occur two such projections, of an acutely triangular 

 form, both placed in the middle line, and pointing the one posteriorly, the other anteriorly. 

 On tlie first segment may also be observed two projections, of which, however, the 

 anterior is very small, whereas the posterior is rather large, and points straight upwaril. 

 On the other segments, only a small projection is seen in the middle of the posterioi- 

 margin. The epimeral plates issuing from the anterior section of the last segment are, as 

 in Gnat}tx)phausia longispina, armed with two small denticles. 



The eyes are very small and narrow, the cornea being scarcely expanded, and only 

 occupjdng the outermost extremity of the eye. 



The antennulae do not seem to exhiliit any essential difference from those in other 



(ZOOL. C'HALL. EXl". PAUT XXX VII. — 1 88-5.) < 'O 7 



