92 RecoiJs of the Iitdiaii Maseuni. [Vol. XIV, 



5 or 0, very rarely 8).^ The rostrum be.uius as a dorsal crest a little 

 ill front of the middle point of the carapace. The dorsal teeth are 

 larye and in front of each there is a fringe of five setae. The three 

 jjosterior teeth are, as a rule, situated on the carapace ; occasionally 

 the third tooth is placed immediately over the orbit. The posterior 

 teeth are rather widely spaced ; the three or four on the basal half of 

 the rostrum proper are a little closer together. Near the apex there 

 are from one to three rather small dorsal teeth, which are sometimes 

 so close to the tip as to give it a bifid or even trifid appearance, and bet- 

 ween these and the teeth on the proximal part of the rostrum there is 

 usually one tooth, remote from those before or behind it. On the lower 

 border the teeth are large, with fringes of setae as on the upper margin ; 

 they are rather crowded at the base, but more distantly spaced towards 

 the apex. There is no well marked lateral keel on the rostrum. 



The carapace is smooth, without trace of roughness or spinulation. 

 The antennal tooth is situated a little behind the frontal margin. The 

 hepatic tooth is below the level of the antennal ; beneath and behind it 

 there is a deep longitudinal depression. 



The eye is short and broad ; the breadth of the cornea is about one 

 and a half times the dorsal length of the stalk. The ocellus is well 

 marked as usual. 



The anteimular peduncle is normal in form. The lateral process 

 of the basal segment ends in a tooth that reaches beyond the middle 

 of the second segment. The dorsal lengths of the second and third 

 segments are about equal. The shorter ramus of the outer antennular 

 flagellum is fused basally with its fellow for a distance equal to less than 

 one-fifth of its total length, the fused portion comprising some eight or 

 nine segments. The shorter ramus, viewed from above, is strongly 

 serrate externally. The antennal scale is parallel-sided, with the outer 

 margin nearly straight ; it is about three and a half times as long as 

 broad. 



The mandibular palp is composed of three segments. The third 

 maxillipedes reach almost to the end of the second segment of the anten- 

 nular peduncle. 



The first peraeopods extend to the end of the antennal scale in spec- 

 imens of moderate size. In large individuals they are proportionately 

 a little longer, reaching beyond the scale by half or more of the chela. 

 The merus is little more than three-quarters the length of the carpus. 

 The carpus is about two and a half times as long as the chela and the 

 fingers, which bear tufts of setae, are about equal in length with the 

 palm. 



The second peraeopods (pi. xxv, fig. o) are almost or quite equal ; 

 they are smooth, slender, and do not dift'er in the two sexes. They are 

 never more than half the total length of the animal and apparently do 

 not attain the extreme development met with in many species of the 

 genus. In well grown individuals they reach beyond the antennal scale 

 by the chela and sometimes by a small portion of the carpus also, 

 reaching beyond the end of the rostrum by a portion of the finger-length. 



^ Of fifty spaciinens eighteen have 5 ventral teeth, twenty-six have 6, five have 7 

 and one has 8. 



