1 62 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3 d Ser. 



somites, in the exceedingly modified form of paleae. Ventral setae about thirty 

 in each fascicle, compound, with cultrate appendage (PI. VI, figs. 17, 19), the 

 latter hooked at tip, finely spinulose on its straight border. Medulla of shaft 

 cross-striated, forked at point of articulation with appendage. 



Paleae on all somites except peristomial and anal; they are of two sizes: 

 (1) a lateral group of three to five narrow ones, extending at right angles to 

 long axis of body; (2) a circlet of twenty or more, considerably broader and 

 longer (PI. VI, fig. iS), lying dorsally, and covering the succeeding somite like a 

 thatch of palm leaves. Paleae of different somites vary in width. Those of 

 the second much narrower than the rest, and like the lateral groups. All, 

 however, are constructed after one pattern. An average one is shown in fig. 

 18. It is curved in two planes; upper surface concave, the upcurved edges 

 serrate and slightly involute, tip curved towards median line of animal, acute. 

 Seven to eight longitudinal ribs, and numerous, fine, parallel, transverse 

 striations. All paleae have a golden-brown luster. 



Parapodia with dorsal and ventral aciculas (fig. 17), the ventral nearly three 

 times the length of the dorsal. Ventral ramus long and slender; dorsal ramus a 

 slight, rounded, broad protuberance. Both dorsal and ventral cirri jointed, 

 terminal portions very similar in form, subulate. 



Approximate number of somites in two specimens, 55 and 41. Buccal 

 somites, first to fifth. 



Measurements. — Length, 4.57 mm.; width across broadest part of body, 

 .79 mm. 



Habitat. — San Pedro Harbor, California (15 feet). 



This little Palmyrid was found but once, in small num- 

 bers, in December, 1895. Like the type species, C. fra- 

 gile Ehlers, it is notable for the readiness with which it 

 breaks transversely. In a preserved specimen the indi- 

 vidual somites may be readily detached, one after the other, 

 from the trunk. The related species of our coast, Hete- 

 rofiale bellis, has the same characteristic. 



This form shows numerous points of difference from 

 C . fragile in the shape of the paleae, of the setae, of the 

 dorsal cirri, and of the eyes. I have had no opportunity to 

 compare it with the description of C. debile (Grube) 

 Ehlers. 



Heteropale, gen. nov. 1 



Preoral lobe not distinct externally from peristomium. Palpi present. 

 Eyes four, tetragonal in arrangement. Tentacle unjointed, about equal to 

 antennae. Antennas two, each composed of a long basal piece and a small 

 terminal segment. Dorsal peristomial cirri two, similar to antennae. No 



1 From £Tepo$, varied, and TraJ.yj, palea. 



