I. '08. 21 



rostrum is unarmed except for a fringe of long plumose setae, 

 shorter setae of a similar character occurring in the spaces 

 between the dorsal teeth. On the carapace a pronounced mid- 

 dorsal carina runs backwards from the rostrum, disappearing 

 in its posterior third. The cervical groove is deeply cut on 

 each side and extends up to, but not across, the dorsal carina ; 

 from its lower extremity a short carina runs downwards and 

 forwards ending in a prominent hepatic spine. There is a 

 strong post -orbital spine, and small but acute spines also mark 

 the orbital and antennal angles ; an obtuse prominence repre- 

 sents the branchiostegal spine. 



The abdomen, when straightened, is about twice the length 

 of the carapace (excluding rostrum), but in one very large 

 female it is considerably shorter than this. The last four 

 somites are dorsally carinate ; on the third the carina is rather 

 faint and obsolete anteriorly, while on the sixth it is very 

 sharply defined and is produced posteriorly to a short spine. 

 The sixth somite is about as long as the fifth, and its pleura 

 are provided with a short spine in front of the rounded 

 postero-basal angle. 



The telson is about equal in length to the outer uropod ; it is 

 deeply channelled dorsally, and its margin is finely setose and 

 armed with a single pair of stout lateral spines at about one 

 quarter of its length frorn the pointed apex. 



The antennules exceed the combined length of the carapace 

 and rostrum by about two-thirds the length of the latter ; the 

 peduncle reaches almost to the apex of the antennal scale. The 

 basal pedunclar point, which is about the same length as that 

 succeeding it, is deeply hollowed for the reception of the eye, 

 the bottom of the joint being in fact quite membranous. The 

 internal and external margins are thickened ; the former bears 

 a twisted setose scale reaching beyond the tip of the rostrum, 

 while the latter is provided distally with a sharp spine-like 

 lateral process. The antennular flagella are internally chan- 

 nelled throughout their length, and by the apposition and 

 overlapping of their edges form a complete tube which is 

 specially characteristic of the genus Solenocera. The upper 

 part of the tube is formed by the two upper (and outer) rami 

 which are twisted inwards and are partially overlapped by the 

 much broader lower (and inner) flagella.^ These upper 

 flagella are somewhat crescentic in transverse section with an 

 obscure midrib, and their dorsal edges are maintained in close 

 conjunction by the interlocking of short stiff setae. The in- 

 ferior and broader rami are strongly crescentic in transverse 

 section with a pronounced midrib on which the lower edges of 

 the upper pair rest ; they interlock basally by means of 

 numerous long curved setae set on the outer aspect of their 

 inferior ejdge, while other long setae from the middle point 

 of their upper edge lap over on the superior pair. PI. II, fig. 3, 

 shows the appearance of the flagella in transverse section. 



1 Various authors have stated that the upper and outer flagella are 

 entirely ensheathed by the lower and inner, but this was not found to 

 be so in any of the specimens examined. 



