PLATYNEREIS POLYSCALMA. 219 



(lat. 33° 40' N., long. 119° 35' W.). Depth 900 fms. 7 October, 1904. One 

 specimen. 



A characteristic feature of this species is in the structure of the stout crochets 

 in the notopodial fascicles, which in details is obviously different from that of 

 the crochets of U. agassizi. The latter is a larger and proportionately stouter 

 species with a broader head, shorter tentacles, palps having the distal article 

 relatively clearly shorter, and with the notocirri in the middle region much 

 shorter. It is common on the coast of California in the littoral zone down to 

 60 fms. 



Platynereis Kinberg. 



Ofvers. K. vet. akad. Forh., 1865, no. 4, p. 177; St. Joseph, Ann. sci. nat., 1897, ser. 5, 8, p. 286; 



Gravier, Nouv. arch. Mus. hist, nat., 1901, ser. 4, 3, ]). 155, 197. 

 Iphivercis M-\i.mgren, Nordiska hafs. annulater, 1865, p. 181. 

 Leontis Malmgben, Annulata Polychaeta, 1867, p. 52. 



Platynereis polyscalma, sp. nov.^ 

 Plate 30, fig. 5-8; Plate 31, fig. 1-10; Plate 32, fig. 1, 2. 



Epitokous Male (Heteronereis). 



The general color is dull yellow, with the eyes soUd black and the preocular 

 portion of the prostomium colorless and translucent. The cirri also colorless. 

 Under the lens it is seen that in the posterior division there is dorsally a minute 

 spot or short streak of purplish color on the base of each parapodium and also 

 a longitudinal middorsal series of spots of the same color becoming fainter 

 cephalad and not extending into the anterior region, whereas the lateral series 

 may do so; on the ventral surface of the posterior division similar series of 

 purpUsh dots occur with usually additional markings farther distad on the para- 

 podia and ventral cirri. Setae colorless and transparent. 



The largest specimen in the collection is 20 mm. long with a maximum width, 

 exclusive of the parapodia, of 2.1 mm. The body is widest near the middle of 

 its length and narrows to a slenderly acute caudal tip and also decidedly cepha- 

 lad, the body also appearing more or less constricted at the junction of the 

 nereid and heteronereid divisions. The number of somites in the anterior 

 or nereid division of the body is apparently always fifteen. In the heteronereid 



' 7roX(rjKoX;uos, many oared. 



