I. '08. 50 



ance. The carapace is rather more than half the length of the 

 abdomen and telson combined ; it is produced anteriorly to a 

 short rostrum. Viewed from above, the carapace conceals 

 almost the whole of the eyes. The latter are, of course, un- 

 pigmented and at this stage show no trace of facets. A smgle 

 joint conifjoses the antennular peduncle and another, of about 

 the same length, the outer flagcUum ; a small process from 

 the inner distal angle of the peduncular joint represents the 

 first beginning of the inner flagellum. The antenna! scales 

 are well developed, nearly half the length of the rostrum and 

 carapace, and rather more than two and a half times as long 

 as wide. The outer margin is convex, terminating in a tri- 

 angular distal spine; the setae of the inner margin are all 

 broken off. The antennal flagella are about two-thirds the 

 length of the scale. 



The mandibles are simple lobes, without trace of dentition 

 or of palps. A trilobed process (fig. 6) represents the first 

 maxilla; in the second maxilla (fig. 7) the endopod is short, 

 while the exopod bears numerous plumose setae. The maxilli- 

 pedes are biramous and much longer than the pereiopods ; the 

 endopods, which hardly show any trace of segmentation, are 

 shorter than the exopods. Five pereiopods, all unsegmented 

 and all possessing exopods, are present; the exopods decrease 

 in size from before backwards. The endopod of the fourth 

 pair is already slightly shorter than that of the fifth. Of the 

 branchiae (fig. 8), five pleurobranchs are developed over the 

 bases of the five pereiopods ; that over the first is the largest, 

 while the gill over the fifth is little more than a papilla. 



Five pairs of pleopods are represented by minute buds. The 

 sixth somite and telson, wdiich are not clearly differentiated 

 from each other, are longer than the carapace. ISTo uropods 

 are free as yet. The telson is very broadly laminar ; in wddth 

 it is almost equal to two-thirds' the length of the sixth somite 

 and telson combined. It is roughly triangular and apically 

 slightly convex ; in perfect specimens it is doubtless provided 

 with spines at the extremity. 



Other larval specimens, five in number, were taken in a 

 different haul (S.E. 224), and show the transition between the 

 form with the broad telson, described above, and post-larval 

 individuals. The youngest example found in this haul 

 measures a little more than 15 mm. in length ; it is a trifle 

 longer than the other four specimens, which represent a later 

 stage. With such a small number of specimens it is impossible 

 to determine if there is a real reduction in length between 

 these stages ; it would not be altogether surprising if such was 

 the case. 



In the youngest of the five larval specimens in this haul, 

 the antennular peduncle shows traces of sub-division, the outer 

 flagellum reaches to the apex of the antennal scale, the inner 

 ramus being about half its length. The antennal flagellum 

 also reaches about to the apex of the scale. The rostrum, e5^es 

 and carapace are much the same as in the later stage, described 



