REPORT OX THE SCHIZOPODA. 121 



The form of the body (see PL XXI. figs. 8, 9) n]>pears rather short and clumsy, and 

 slightly compressed. It tapers gradually from Ijcfore Ijackwards, and has the tail about 

 twice the length of the anterior division. 



The carapace is comparatively short, and exhibits on either side a weU-marked lateral 

 denticle jutting out from the lower margins somewhat posterior to the middle, or rather, 

 just above the insertion of the antepenultimate pair of legs. Its anterior part is defined 

 posteriorly by a slight cervical impression, and exhibits above a distinct, tliough not very 

 elevated, keel, continued along the upper face of the rostral projection. The latter (see 

 fig. 12) is rather produced, reaching considerably beyond the middle of the basal joint of 

 the autennula3, and has a narrow lanceolate form, being somewhat appresscd at the sides. 

 In the male this projection (see fig. 17) exhibits a somewhat different aspect, being 

 remarkably constricted at the base and slightly expanded at the apex, which is bluntly 

 lanceolate. The antero-lateral corners of the carapace (see fig. 8) are drawn out to a 

 rather j)rominent acute-angled lobe, overlapping externally the basal part of the antennae. 

 The posterior emargination of the carapace is not very deep, and without any lateral 

 sinus. 



The caudal segments are quite smooth above, and diminish successively in height 

 posteriorly. The epimera are well developed, and of a somewhat angular form, pointing 

 obliquely backwards. The last segment is a trifle longer than the preceding, and some- 

 what narrow. The preanal spine (fig. 16) exhibits a rather characteristic appearance, 

 being very broad, lamellar, and with coarse denticles, arranged in a pectinate manner, 

 along the posterior edge. 



The -eyes (see figs. 10, 11) are very large and thick, irregularly globose, with the 

 pedicle very short, and the cornea greatly expanded. The latter is, as in other species of 

 the genus, somewhat contracted in its upper part, and divided, as it were, into two 

 unequal sections by a slight transverse impression, crossing the cornea, a little aliove the 

 mesial part. 



The antennular peduncle (figs. 13, 14) is rather slender, and scarcely exceeds in length 

 half the carapace. The basal joint is about as long as the two others taken together, and 

 very much flattened, with the anterior border somewhat projecting above and densely 

 setose, as also exhil)itiug, at some distance from the inner corner, a narrow indentation. 

 Its outer corner is drawn out to a dentiform projection, and a little below the inner, two 

 strono- plumose setae are seen to originate. The two outer joints are very narrow, and 

 cylindrical in form, the last a trifle longer than the other. The flagella (see fig. 12) are 

 both exceedingly short, scarcely half as long as the peduncle, and composed of ten to 

 twelve short articulations. 



The antennal scale (see fig. 15) is comparatively large, reaching tar beyond the 

 second joint of the antennular peduncle. It exhibits a somewhat oblong form, and 

 tapers gradually toward the apex, which is very oblicjuely rounded, with the outer 



(ZOOL. CHAIX. EXP. PART XXXVII. — 1885.) Oo 16 



