496 PROCEEDINGS OF THE ACADEMY OF [May, 



setae, rather abruptly attenuated at the surface of the body wall, occur 

 in all setigerous somites. The anterior ones project about one-third 

 as far ar the larger setse, but in the posterior segments they become 

 much longer and filamentous. Winged setse also occur in all somites. 

 They are about three or four times the diameter of the smaller ones in 

 their exposed parts and quite deeply colored, nearly straight, tapered 

 to an acute tip, broadly winged on one margin and very slightly on 

 the other. The stoutest ones occur in the posterior thoracic somites, 

 where also setse of intermediate form are present, some of the smaller 

 ones having short basal wings. In the abdominal bimdles most of 

 the larger setse are provided with delicate doubly spirally fringed tips 

 (PI. XXXVIII, fig. 35) which differ considerably in length, the longest 

 in the middle abdominal region forming more than one-half of the 

 exposed portion. Posteriorly the number of setse is reduced, the fila- 

 mentous ones predominating. 



The uncini are all rather stout and of a deep yellow color; 7 or 8 

 occur on III, about 10 on V, and about 35 on VIII and the following 

 somites. On somites III to V the uncini have the form shoTvm in PI. 

 XXXVIII, fig. 32. The stems are very slightly curved, strongly stri- 

 ated and have a scarcel}^ perceptible shoulder; the heads are but little 

 enlarged with a blunt pointed beak bent at an angle of 100° to 120°; 

 a crest composed of two rows of teeth, the anterior with a few large 

 teeth in the middle, the posterior and lateral smaller, and a simple 

 guard of about 12 spreading hairs ending at the tip of the beak. On 

 the remaining somites the crochets form a much longer row and have 

 the stems more curved, the shoulder larger, the head more expanded, 

 the beak much longer, more acute, much more strongly hooked at an 

 acute angle, the crest more elevated, with the smaller teeth in more 

 numerous rows and more closely embracing the base of the beak, and 

 the guard arising from a distinct flange below a re-entering angle (PI. 

 XXXVIII, fig. 33). 



This species is represented by a large number of examples. 



Terebella (Schmardanella) californica n. .=. (PI. XXXVIII, figs. 36, 37.) 



This species has the general aspect of Amphiti'ite spiralis Johnson, 

 from which it is readily separated by the much smaller number of 

 setigerous somites in addition to other characters. The type measures 

 75 mm. from the pygidium to the tip of the prostomium, but another 

 less perfect specimen is nearly twice as large; the diameter at X is 3.3 

 mm. The prostomium is prominent, little arched, projects forward 

 and is faintly trilobed its margin slightly revolute and its lateral por- 



