1903.] NATURAL SCIENCES OF PHILADELPHIA. 419 



pointed, the outer half marked with transverse rows of rather coarse 

 serrulge. Neiiropodial setae in 2 or 3 vertical rows between ensheathing 

 lips ; pale amber color, free end enlarged for a greater distance on the 

 ventralmost setse, curved slightly dorsad, the tip bifid, the longer ter- 

 minal process curved but not hooked, the ventral spur straight, large 

 and continuous with the distal comb, transverse combs 12-17, and, 

 with the exception of a few proximad of the enlargement, all with 

 long teeth. 



The station at which the type was taken is unknown; a fragment 

 also occurs in the collections from Sta. 3,708, Suruga Bay, 60-70 fms. 

 Hylosynda magnacornuta sp. nov. (PI. XXIII, fig. 18.) 



A slender species described from a fragment consisting of the head 

 and 26 somites. 



Prostomium about H times as long as broad, but the prominent 

 muscular ridges which extend from its sides to the peristomial parapo- 

 dia make it appear much broader, about twice as broad as long if these 

 are included in the measurement. A median dorsal groove divides 

 both anterior and posterior margins, but fades out at the vertex, 

 anterior lobes broadly rounded, continuous with the bases of the lateral 

 tentacles. Eyes 2 pairs, widely separated, small, black; anterior pair 

 slightly the larger, lateral in position and nearer the anterior than pos- 

 terior margin of the head, scarcely visible from above. Posterior pair 

 smaller, entirely dorsal, separated from posterior border by al)out 

 twice their diameter and from each other by about 7 times their diam- 

 eter. Tentaclestylesalllost,theirceratophoressmall,the lateral slightly 

 more dorsal than the median and arising without any definite boundary 

 from the anterior prostomial lobes; all sharply distinguished from the 

 colorless head by thin deep chocolate bases. Palpi very large, about 

 6 times the length of the head and at thickest part more than | its width, 

 the base constricted at its point of origin beneath the prostomium, 

 gradually thickened to the end of the first fourth and then tapered to 

 the long slender tip. Proboscis protruded, equal to head and 1st 11 

 somites; besides the dark brown paired long claw-like jaws, there 

 is a small, low, conical, nearly black median dorsal and a similar ventral 

 tooth; papillie |, sharp-pointed, scarcely bilobed. 



Tentacular cirri lost. Ventral surface of body smooth. Neural 

 groove about | the width of the lateral muscle areas anteriorly, dimin- 

 ishing to ^ posteriorly. The two halves of the nerve cord widely 

 separated as far as somite XI or XII, then gradually approaching but 

 not completely united within the limits of this specimen. Nephridial 

 tubercles begin on V, soon becoming conspicuous and standing out 



