1910.] NATURAL SCIENCES OF PHILADELPHIA. 361 



jecting from below the tip of the aciculum. Neuropodial setae (P . 

 XXX, figs. 37 and 38) more numerous, arranged in three supra-acicular 

 and six or seven subacicular series. All much longer than the notopo- 

 dials but averaging only about one-third their diameter; the shafts 

 long and distal enlargements inconspicuous, slightly curved and tapered 

 to long, prominent but not especially slender smooth tips, below which 

 are narrow pectinations which become longer and more prominent 

 distad. Setae of the two dorsal rows (fig. 37 a ) are especially 

 slender, with the little enlarged pectinated regions taking up about 

 half of the exposed portion and bearing thirty-five or more pairs of 

 pectinse. Those of middle rows (fig. 37 6 ) are stouter and bear about 

 thirty pairs of pectinse of which the basal ones are mere striations, 

 the smooth tips being especially elongated. Setse of the ventralmost 

 row (fig. 37 c ) have much shorter distal regions with fewer pectinse and 

 very acute tips. Posteriorly all setse become longer and more slender. 



Except for a slight duskiness in places pigment appears to be wanting 

 but the cuticle exhibits a purplish iridescence. 



In the character of its setse this species departs somewhat from the 

 typical condition and approaches Eunoc. 



Stations 4,381, off North Coronado Island, vicinity of San Diego, 

 618-667 fathoms, green mud; 4,517, Monterey Bay, off Point Pinos 

 Light, 750-766 fathoms, green mud and sand (type and cotype). 



Gattyana senta Moore. 



Gattyana senta Moore, Proc. Acad. Nat. Sci. Phila., 1902, pp. 259-2G3, 

 PI. XIII, figs. 1-13. 



One specimen occurs in the collection from each of four stations and 

 two from a fifth. Most of the very characteristic and remarkably 

 protected elytra are in place; often they are blotched with brown;, 

 the marginal spines of posterior elytra have extremely long acute 

 prongs. As Treadwell states the nephridial papillse begin on VI but 

 the anterior ones are very small. 



A medium-sized example has the proboscis protruded. It measures 

 4.5 mm. long, 3.6 mm. deep at the middle and 2.4 mm. wide at the 

 end, being truncate subfusiform in shape, compressed at the base, 

 depressed at the aperture; Apertural papillse nine above and nine 

 below, rather long, blunt at the end. Jaws pale brown, of the usual 

 form, with fang and cutting plate, the ventral somewhat larger and 

 biting to right of upper. 



Stations 4,361, Point Loma Light, vicinity of San Diego, 91-97 

 fathoms, gray sand, mud and rock; 4,377, same, 127-299 fathoms, 

 green mud and sand; 4,420, off San Nicolas Island, 32-33 fathoms,. 



