NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 63 



Anterior segments are more or less completely colored with a dark 

 spot on the middle and a pair of broad bands at the sides. Between the 

 median spot and the dark bands is a pale crescent continuous with the 

 pale ground color of the segments. The median spot is sometimes more 

 or less rectangular in shape. 



D. tridentata is unique in the following: (1) anterior hooded hooks 

 are tridentate, (2) anterior parapodia have prolonged lobes, and (3) the 

 tube is smooth, annulate. In so far as I know, D. brasiliensis Kinberg 

 (1865, p. 559) is the only other species of this genus with tridentate 

 hooded hooks, but in the latter the subacicular hooks appear to be much 

 more strongly curved and the pectinate setae more oblique (Kinberg, 

 1910, pi. 13, fig. 4) ; however, this species has been only briefly described, 

 so that accurate comparison is difficult. 



Holotype.—AYiY no. 37. 



Type locality. — Off Huntington Beach, California, in 8-15 fms (coll. 

 1126-40). 



Distribution. — Southern California, south to Octavia Bay, Colombia, 

 including the Gulf of California north to Consag Rock; Caribbean and 

 West Indian seas. The bathymetric range is 5 to 75 fms. 



Diopatra neotridens, new species 

 Plate 2, Figs. 44-48; Plate 3, Figs. 49-54; Plate 16, Fig. 334 



Collections.— A3S-35 (1); 457-35 (1); 458-35 (1); 770-38 (1); 

 930-38 (2); 944-39 (1); 1030-40 (3) ; 1031-40 (4) ; 1057-40 (about 

 10); 1260-41 (1). 



This is a comparatively large, robust species; an anterior piece of 70 

 setigers measures 60 mm long (coll. 944-39). Gross features include (1) 

 long, filamentous occipital tentacles, crossed by alternating light and dark 

 bands of pigment; (2) greatly prolonged, spiraled branchiae, the fila- 

 ments disposed in widely spaced ranks and consisting of about 12 whorls 

 of rather short filaments; and (3) a coarsely constructed, untidy-appear- 

 ing tube. 



The prostomial lobe is semicircular, inconspicuous, eyespots seemingly 

 absent. The frontal antennae are about 2^/^ times as long as wide at the 

 base, taper distally, and are weakly annulate but smooth. The occipital 

 tentacles are long, with well-developed ceratophores and styles ; the long- 

 est or inner lateral ones are as long as the first 21 setigers, the median 

 and outer laterals are shorter. Ceratophores are strongly annulate, the 

 median with 10 or 11 rings, the inner laterals with about 12 rings, and 

 the outer laterals with 11 to 13 rings. (In a specimen from coll. 930-39 



