1909.] NATURAL SCIENCES OF PHILADELPHIA. 279 



line and bearing a series of crochets extending over about one-sixth 

 of the body circumference. Notopodia similar but smaller, the first 

 bearing capillary setse, the others crochets. Number of neuropodial 

 crochets on XIX 12-14, on XXV 32, notopodials on XXV 16. 



Posterior abdominal segments bear rather conspicuous tufted 

 dorsal gills, each consisting of eight or ten short filaments arising 

 close together from the posterior margin of the segment in line with 

 the notopodia. The most anterior of these gills are small and some- 

 what pectinate, farther back they increase in size until the filaments 

 have a length of one-third to one-half the diameter of the segments. 



All setae are of the usual limbate, capillary form with very slender 

 tips. The crochets (PI. IX, fig. 56) have a distinct shoulder, a neck 

 that gradually increases in diameter to a rather large head with stout 

 beak and high crest enclosed in a short but much inflated hood. 



Each of the specimens is enveloped in a thin membranous tube 

 covered by a single layer of loosely attached sand grains. 



Taken only at San Diego at low water by E. C. Starks; four speci- 

 mens. 



As both this species and the type of Eunotomastus are known from 

 incomplete specimens it is by no means certain that E. gordiodes 

 is correctly referred to this genus. 



Dasybranchus giganteus (Moore) (Plate IX, fig. 57). 



Notomastus giganteus Moore, Proc. Acad. Nat. Sci. Phila., 1906, pp. 227, 

 228; PI. X, figs. 24, 25. 



Specimens in this collection much better preserved than the type 

 enable me to correct and amplify the original description and to correct 

 the generic reference. The stout form and large size are of course 

 not at all noteworthy in the genus to which the worm is now referred. 



Prostomium much retracted so that the tip alone is visible. Pro- 

 truded proboscis subglobular, bulbous, with a rosette-like end pre- 

 senting eight sulcated radiating lobes and proximad to this a closely 

 granulated basal ring. 



All six specimens have twelve thoracic segments. Peristomium 

 about as long as succeeding segments, achsetous and biannulate. 

 Remaining thoracic segments setigerous, strongly biannulated and 

 areolated on the surface. Notopodial and neuropodial fascicles both 

 simple linear tufts borne on the posterior ring just behind a tenon- 

 like inset of the anterior ring. Except on the first two or three setiger- 

 ous segments the neuropodial fascicles are nearly twice as wide as the 

 notopodial and separated by a ventral interval of nearly one-half 

 the body diameter, the inter-ramal interval being slightly more than 



