1923] NATURAL SCIENCES OF PHILADELPHIA 193 



times to the short terminal twigs. Third pair very small. Eye- 

 spots brown, very numerous, in a crowded transverse band with a 

 short median interruption. iSmall lateral wings or flanges on II 

 and III, the former about twice the size of the latter and more 

 ventral in position. Ventral gland plates rather ill-defined, fifteen 

 or sixteen in nuin])er and occupying the entire space between 

 the ventral ends of the tori. Anterior ones are rugous with 

 longitudinal furrows, and the last one is very indistinct. 



Station 4399, lat. 32° 44' 50" N., long. 117° 48' 45" W., 245- 

 285 fathoms, fine gray sand, rocks. 



Amphitrite robusta Johnson. 



'^ Numerous specimens agree perfectly with Johnson's description 

 and with examples from Alaska but some of the larger ones from 

 Stations 4415 and 4427 have the gills much more richly branched 

 with more numerous terminal filaments. 



Stations 4310, off Point Loma Lighthouse, 71 fathoms, fine sand 

 and shells; 4405, off San Clemente Island, 654-704 fathoms, green 

 mud; 4415, off Santa Barbara Island, 302-638 fathoms, green mud; 

 4421, off San Nicolas Island, 238 fathoms, fine gray sand and rocks; 

 4425, same locality, 1084-1100 fathoms, green mud, fine sand, 

 Globigeri?ia; 4427, off Santa Cruz Island, 447-510 fathoms, black 

 mud and rocks; 4430, same locality, 197-281 fathoms, black sand 

 and pebbles; 4460, off Point Pinos Lighthouse, 55-67 fathoms, 

 green mud, Globigerina; 4461, same locality, 285-357 fathoms, 

 green mud; 4496, same locality, 10 fathoms; fine gray sand and 

 rocks; 4517, same locality, 750-766, green mud and sand. Most 

 ple;itiful at 4427. 



, Amphitrite radiata ^roore. 



A complete example is 37 mm. long exclusive of the tentacles 

 and 3 mm. in diameter. Segments 64, IV-XX setigerous. Gills — 

 three pairs on II, III and IV, having 16, 14 and 11 filaments 

 respectively. Slight wings on the same segments and cirri on 

 VI, VII and VIII. 



Station 4421, 447-510 fathoms, black mud and rocks. 



Pista cristata Miilkr. 



In all sixteen specimens, some of which are excellently preserved, 

 of this European species were studied. Most of them are 80-90 

 mm. long and 3-3.5 mm. in diameter, with three plume-like gills 

 of the usual form and of very unequal size, but one has all four 



