1904.] MARIXE FAUXA OP ZAXZilBAR. 289 



wide, from 10 fathoms in Wasin Harbour, East Africa; and one, 

 larger, 6 mm. wide, dredged off N. Male Atoll, Maldives, from 35 

 fathoms, bottom sand. 



This species is nearly related to the two following, but is readily 

 distinguished from E. afra by the early commencement of the gills, 

 and from E. coccinea by their pei^sistence to the end of the body.] 



The specimens correspond very closely and in detail with the 

 account given by Gravier. 



The body is flat anteriorly, immediately behind the buccal seg- 

 ment, though arched dorsally behind. The shortness of the 

 segments immediately following the head is also a feature of note. 



In the smaller specimens the annulation of the tentacles is not 

 so easily seen as in the larger. These also differ in the jaw- 

 apparatus, which in the younger are delicate and calcareous, in 

 the adult dark brown. The ends of the lower plates, however, 

 remain white, thus, as in their shape, exactly resembling those of 

 E.flaccida. 



The forms of the other plates call for no remark, and the 

 following are the formula of their teeth : — 6 — 7 : 6 -}- 8 — 8 and 

 5 — 5 : 7 + 7 — 9; the latter corresponding closely with that given 

 by Gravier. 



The gills usually begin at the third foot, but in the two East- 

 African specimiens rather later, viz. at the seventh or eighth. 



It is impossible not to regard with great doubt the distinction 

 drawn by Gravier between this species and Grube's E. lo7igicirris 

 from Suez. The annxdation of the appendages varies in distinct- 

 ness in these specimens, in the largest of which it can be made 

 out in the anterior dorsal cirri as in Grube's species. The length 

 of the tentacular cirri, which in Grube's specimen reach to the 

 anterior border of the prostomium, may be abnoi-mally great, 

 though in one of these the cirri reach well beyond the anterior 

 border of the buccal segment. When a complete specimen is 

 examined it is seen to be true for these, as for Grube's example, 

 that most of the gills reach scarcely half the length of the dorsal 

 cirrus. The larger anterioi- ones anteriorly are of about the same 

 length, which, allowing for a reasonable amount of variation, 

 corresponds with both Grube's and Gravier's accounts. 



However, the bi'evity of the latter gives enough uncertainty to 

 justify the creation of a new name for these specimens, until 

 Grube's work can be verified and completed. 



Eunice afba Peters. (Plate X.X. figs. 1-5.) 



Eunice collaris Grube, Annulata Semperiana ; Gravier, Nouv. 

 Arch, du Mus. de Paris, 1900, p. 251. 

 Eunice perrieri Gravier, loc. cit. p. 232. 

 Eunice mutabilis Gravier, loc. cit. p. 245. 

 For other synonymy see Ehlers, Nachr, zu Gott. 1897 *. 

 This species, among the least specialised of the genus, besides 



* In a note on this species just received, Dr. A. Willey gives E. paupera Gr. as 

 vet another synonym. 



PBGC. ZooL. Soc— 1904, Vol. I. No. XIX. 19 



