ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 255 



In another paper* Ramsay described Nereids from the Pacific, with 

 particular reference to a representative of the little known genus, 

 Micronereis, which is apparently identical with M.variegata Claparede 

 of European waters, the solitary species of the genus, lie argues that 

 Micronereis may be . reasonably regarded as a more or less unaltered 

 representative of a primitive ancestral form of the Nereidae. The 

 collection also included the remarkable and interesting Nereis cyclurus 

 Harr., a study of which affords some new facts as to seta3. 



Atlantic Chsetopterids.f — F. A. Potts describes three new forms 

 from the coastal waters of the Gulf of Georgia and Puget Sound — Meso- 

 cheetopterus taylori g. etsp. n., Phyllochsetopterus prolifica sp. n., and 

 Telepsavus sp. The new genus includes Cheetopterids with a well- 

 developed peristomial collar and a pair of long peristomial tentacles. 

 The body is divided into three regions. The anterior contains nine to 

 thirteen setigerous segments ; the parapodia are represented by short and 

 conical notopodia with capillary seta? ; in the"fourlh setigerous segment 

 several of the dorsal setas are enlarged. The median region is composed 

 of two or three elongated segments, forming dorsally a flat region, witli 

 continuous lateral borders, covered with glandular epithelium and orna- 

 mented with transverse ridges. Typically the notopodia are rather 

 enlarged, conical, and fleshy, with a groove running down the inner 

 border ; the neuropodia are single in the first, double in the succeeding 

 segment or segments, and contain uncini. The posterior region contains 

 a large number of segments similar to those in Chsetopterus, but with 

 much shorter notopodia. A dorsal ciliated groove runs from the mouth 

 along the median line to the posterior end. In one or more of the 

 median segments the lips are enlarged to form a fleshy organ. 



The new genus partly bridges the gap between the remarkable form 

 Chsetopterus and the other members of the family. It agrees with 

 Chsetopterus in the reduced number and specialized character of the 

 segments of the median region. It resembles Phyllochsetopterus in the 

 continuous ciliated groove and the long tentacles. 



In l^ujllochsetopterus pacifica the tubes are slender and creeping, 

 usually containing several individuals, and possessing several short 

 branches opening to the exterior. There is asexual multiplication by 

 autotomy. Fragmentation takes place in the median region, and re- 

 generation proceeds on the anterior and posterior surfaces of the plane of 

 rupture. The median segments usually regenerate anterior or posterior 

 segments, and only segments like themselves when the other two regions 

 have been completed. 



The genus Telepsavus has been hitherto known only from the 

 Mediterranean and the Red Sea. It is a very common and widely- 

 distributed member of the beach fauna of British Columbia. The author 

 describes Phyllochsetopterus anglica sp. n. from the English Channel. 

 The tubes are creeping, and often several run parallel with short lateral 

 connexions. The same system of tubes includes more than one; in- 



* Proc. Zool. Soc, 1914, pp. 237-50 (7 figs.). 



t Proc. Zool. Soc, 1914, pp. 955-94 (6 pis. and 13 %s ). 



