794 PROCEEDINGS OF THE ACADEMY OF [DeC, 



Unlike the Amphinomc, most of these were found on the under side 

 of the logs away from the light, associated with crabs and nudibranches, 

 and less frequently among the barnacles on the sides and upper surface. 

 By means of their strong neuropodial hooks they cling most tenaciously 

 and move very sluggishly. The larger ones were of a deep orange- 

 red color, due to the great number of small spherical ova with which 

 the body wall was distended, and the expulsion of which caused the 

 color to quickly fade. 



Again, unlike the Amphinome, which is a common annelid in the 

 littoral zone of the West Indies, this species probably finds its normal 

 habitat on floating objects. The original examples of Audouin and 

 Milne-Edwards' came from Port Jackson, while the Challenger took the 

 species in the Atlantic Ocean, 100 miles north of Bermuda, and also in 

 the North Pacific, in one case attached to a log and in the other among 

 masses of Lepcis fascicularis floating at the surface. BaircP also notes 

 that the British Museum contains specimens taken amongst barnacles 

 on a floating log near Madeira, and others from within the valves of 

 Lcpas fascicularis from near St. Helena. 

 Drieschia pellucida n. sp. 



This is a slender species, the single representative of which has a 

 total length, including the protruded proboscis, of 14 mm., a maximum 

 breadth of body of about 1 mm., a width between the tips of the para- 

 podia of 2.8 mm. and between the ends of the longest setae of 6 mm. 



The prostomium (PI. LY, fig. 1) is of the Lcpidonotus type, is # as 

 long as broad, regularly convex laterally, slightly concave posteriorly 

 and deeply cleft anteriorly to accommodate the ceratophore of the 

 median tentacle, on each side of which the frontal prolongations reach 

 nearly to the same distal level; a broad shallow median depression 

 reaches almost to the posterior margin. The eyes are rather small, cir- 

 cular and black, and because of the beautifully transparent tissues very 

 conspicuous; they are well separated on the sides of the head, the ante- 

 rior pair at the place of its greatest width and the posterior close to the 

 postero-lateral angles and about twice their own diameter from the 

 anterior ej^es. The style of the median tentacle is lost. As in Lepi- 

 donotus, the lateral tentacles arise directly from the frontal processes 

 without any distinct ceratophores ; they are about H times the length 

 of the head, very slender and taper regularly to acute jxjints without 

 any subterminal enlargement or terminal filament. The palpi are 

 widely separated at their origin beneath the sides of the prostomium, 



'^ Ann. Sci. Nat. (1), XX (1830), p. 1.59. 

 * Jour. Linn. Soc. Lon., X (1S6S), p. 239. 



