308 MR, CYRIL CROSSLAND OX THE [Feb. 16,. 



8, e) ; the latter are yellow, more or less sharply bent towards 

 their end, which is two-hooked and normally covered by a guard 

 (PI. XXI. fig. 6, a). The compound setae are of two kinds. In 

 the anterioi' feet are found setae whose end-pieces are knife-shaped 

 (PL XXI. fig. 6, b). At about the 130th segment (at which point 

 the venti'al ciiTus has changed fi-om a broad secretory pad to ;i 

 conical form) those with two-hooked ends appear and shortly 

 thereafter are the only Ivind occuriing. Gi'oups of setae in which 

 all these forms occui- ai'e shown in PI. XXI. figs. 5 & 6, a-e. 



Plate XXI. fig. 5 shows the setae of the 100th foot of an adult- 

 specimen, in which numerous combs, dark-coloured bordered antl 

 striated capillary, and both kinds of compound setae are present. 

 Posteriorly the combs remain equally numerous while the number 

 of the other kinds decreases, and the knife-shaped compound setse 

 disappear and are replaced by the hooked form. One of these is 

 shown enlarged in PI. XXI. fig. 6 (c), while b and d show- the knife- 

 ended form and combs, a is one of the two-hooked acicular setae 

 from the tail-region of an adult, showing merely the remnant of 

 the broken guard. In all these setae the gi'anulation of the surface 

 is well shown. As, however, this and the deep yelloAv colour are 

 not present in fre.shly formed setae, but only in those which have 

 been in use some time, I am inclined to believe the appearance 

 due to an accidental coating of a rust-coloured deposit which is 

 found inside the tubes, especially posterioi'ly, and on the bodies 

 of the worms. 



This difference in the set^e of anterior and posterior feet is quite 

 distinctive of this among all the species of the genus *". Another 

 member of the same group, U. conglomeoxms Ehl. {loc. cit. p. 93), 

 also shows a difference in the compound setae of anterior and 

 posterior feet; but those of the fonner, instead of being " Sabel- 

 borsten," show an interesting intermediate stage betv/een the two 

 forms {loc. cit. pi. 24. fig. 4). In examining the end-pieces of the 

 compound setae of Eunice inclica, which are characterised by the 

 prolongation of the guard to a point beyond the hooks (see fig. 12, c, 

 PL XXI.), one is struck by the resemblance of the outline of the 

 whole to that of one of the " Sabelborsten " so commonly found in 

 the species of Marpliysa. The fusion of the hooks with the guard 

 and the strengthening of the latter in E. indica would form a 

 typical knife-like end-piece. In E. conglomerans this fusion arid 

 strengthening have partially taken place, but the lack of a point 

 to the guard obscui'es the likeness in outline. 



Of the four t other members of this group, Eimice conglomerans 



'■= Except IS. depressa (Schmavda, Neue wirbellose Thiere, p. 127), the description 

 of which is so sli.ajht as to be practically useless. Grube (Mitth. tiber die Fam. der 

 Euniceen) gives the species as a Ilarphysa, upon what evidence except its possession 

 of these " Sabelborsten " is not known. Marpliysa f alia x is the only other Eunicid 

 in which these two kinds of sets occur in one worm, and Eunice impexa Grube 

 ( Annulata Semperiana) and JE.jeffreysii Mcintosh (Annals & Mag. Nat. Hist. ser. 7, 

 vol. xii. 1903) are the only other species of JSmiice in which " Sabelborsten " occur. 



t Koule (Comptes Reudus, torn, cxxvi. p. 1167) includes Eunice ampliilielice, 

 Ji.floi-idana, eind JS. pJiilocorallia all unAev E. gunneri Storm, thus reducing the 

 gTOup to four members in all. 



