256 PROCEEDINGS OF THE ACADEMY OF [April, 



• Nothria geophiliformis Moore. 



Nothria geophiliformis Moore, Proc. Acad. Nat. Sci. Phila., 1903, pp. 445- 

 448, PI. XXV, figs. 57-59. 



Gills may begin on either V or VI, usually the latter. A young speci- 

 men has a pair of minute eye specks. The small size of this species 

 has probably caused it to be overlooked at some stations. The 

 anterior articulated crochets differ strikingly from those of N . ■pallida. 



Stations 4,445, off Point Pinos Lighthouse, Monterey Bay, 60-66 

 fathoms, green mud; 4,480, off Santa Cruz Lighthouse, Monterey Bay, 

 53-76 fathoms, dark green mud and sand; 4,510, off Point Pinos 

 Lighthouse, 91-156, gray mud. 



Nothria pallida sp. nov. PI. XV, figs. 24-28: pi. XVI, 35-37. 



A moderately elongated species, terete anteriorly, depressed for 

 most of the length. The type — an incomplete specimen with the 

 caudal end regenerating — consists of 166 segments and is 82 mm. long 

 with a maximum body width of 4 mm. and a depth of 2.7 mm. at the 

 end of the anterior third. A complete specimen 62 mm. long and 2.8 

 mm. wide has 266 segments. Another broken specimen has an aggre- 

 gate length of 124 mm. and 290 segments. 



Prostomium relatively larger than in iV. geophiloformis, quadrate 

 orbicular in outline, slightly wider than long, with the greatest width 

 at the level of the posterior paired tentacles. No distinct eyes, though 

 several obscure dusky spots appear on the prostomium. Frontal 

 tentacles nearly in contact at the base, arising on extreme anterior 

 border of prostomium, divergent, cylindroid with a lateral emargination 

 about which they are bent into a bean-like shape ; about twice as long 

 as thick and one-half as long as the prostomium. Anterior or outer 

 paired tentacles barely reaching to III, the annulated ceratophore 

 of thirteen rings and a short, non- annulated end, about one and one- 

 fourth times as long as the short, smooth conical style. Posterior 

 lateral tentacles reaching XVI or XVII, the ceratophores nearly as 

 long as the entire anterior tentacles and composed of seventeen rings 

 and a smooth end-piece; styles flagelliform, much more slender than 

 ceratophores and three and one-half times as long. Median tentacle 

 reaching to IX, similar to posterior paired tentacles, but cerataphores 

 only half as long with nine or ten annuli. A small specimen has the 

 styles of the anterior paired tentacles nearly equal to the ceratophores 

 and the median and posterior paired tentacles shorter than on the 

 type, the latter reaching to XII only. Palps situated immediately 

 in front of mouth, separated by a narrow cleft only, thick, quadrate, 

 and divergent, about twice the size of the frontal tentacles. 



