62 ANNELIDS. I. 



The cephalic lobe is somewhat longer than broad (PI. IV, fig. i6), nearly rhombic in shape 

 with rounded corners. The four tentacles are rather strong. Eyes are entirely lacking. 



The first segment is - as usual in the genus Anai'tis — large and prominent, but it does 

 not seem to be fused with the second, as is the case in Anai'tis Wahlbergi and A. kosteriensis. As 

 the material, however, does not allow us to decide this question with absolute certainty, I do not find 

 it reasonable to establish a new species on this single badly preserved specimen. Thus it is possible 

 that the fig. 16, PI. IV is not correct in this respect. The tentacular cirri are rather long and thick, 

 the hindmost the longest. 



The parapodium is of the well-known phyllodocoid shape and terminates in a double flab. The 

 former is somewhat overlapped by the dorsal lamella which, in the foremost part of the animal, is 

 rather circular; more caudaily they grow more ovoid or broadly renal-shaped. The ventral lamella is 

 rather oblong, almost rectangular with rounded corners. 



The setae are of a very characteristic shape; they are much like the setae in the species descri- 

 bed by Percy Moore under the name of Anai'tis fiolynoides, from the coast of California. The shaft 

 (PI. IV, fig. 4, 9) has terminally a rather considerable dilatation, from where project a few small acute 

 prominences, and a single large spine projecting on one side of the eudblade. A similar spine is not 

 uncommon within the family of the Phyllodocidae; rather frequently it is found in the genus Eteone, 

 viz. Eteouc piisilla Orsted and Eteonc flava Malmgren: in Anai'tis it is also found, but not so prominent 

 in any of the known species of this genus. In the species in question it is larger even than in 

 the named species of Eteone. It is straight, conical and tapers gradually towards the tip. 



Mystides occidentalis n. sp. 



PI. IV, figs. 8, 11, 15. 

 Locality: 



The Ingolf-Expedition St. 32. 66°35' N. L. s6°38' W. L, 318 fms. Davis Strait. 



Only one specimen has been taken. The animal is in a bad condition, and the hiudpart of 

 the bod}- is lacking; the part present of the latter has a length of 36 mm. and a breadth of c. Vi 2 mm., 

 parapodia counted. The colour is light ochreous brown. 



The shape of the cephalic lobe is trapezoid (fig. 11) the four tentacles of medium length. Eyes 

 are not seen. The tentacular cirri are rather short, fusiform and all of them of about the same length. 



The parapodium (fig. 15) is low, of medium length and, as usual, provided with a bilobated 

 membraneous flab. The shape of the dorsal lamella is rather lengthened, ovoid; the ventral lamella 

 has a shape like the dorsal but it is relatively shorter and broader; it is only a little prominent and 

 does not reach the tip of the parapodium. 



The setae are rather strong; the shaft of each bristle has in its tip the usual extension, being 

 club or head-shaped and provided with small acute spines, of which the midmost is the largest; on 

 each side of the latter they gradually taper in length; the smallest of these spines are hardly visible even 

 under high magnifying power (Zeiss, Apochr. 2 mm.). The endblade of each of the setae is long, broad 

 at the base but quickly tapering in breadth, it terminates in an exceedingly delicate tip. The concave 

 edge of the eudblade is as usual in these forms finely denticulated (fig. 8). 



