﻿414 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 102 



in the largest specimen both F^ and F^ Apparently F^ never 

 anchors the ascending intestine as in dyscritum (fig. 87, A, B). There 

 are between 20 and 30 coils in the intestinal spire. Between the 

 point of insertion of F' and F^ on the postesophageal gut very tiny 

 pointed protuberances, resembling conical papillae, may be seen in a 

 small minority of specimens. These are probably rudiments of the 

 more prominent and longiserially arranged structures which Collin 

 (1892, p. 180, pi. 11, fig. 13) cites as being especially characteristic of 

 D. peruvianum.. 



The nephridia are slender, free, and very long in all specimens 

 dissected. In natural position the nephrostome opens forward and 

 toward the dorsal median line. 



The contractile vessel (pi. 31, fig. 2) gives off on each side a col- 

 lateral small vessel, which forms a series of loops along the side of 

 the main vessel and continues posteriorly on the esophagus. These 

 vessels do not ordinarily form a vascular net on the ventral side of 

 the esophagus. Terminally the contractile vessel gives off 10 to 13 

 very long slender blind tubules, one of which is median. 



In all specimens examined, most of which were taken in winter, 

 the gonads are slender transverse bands at the base of retractors. 

 The secondary gonads described by Peebles and Fox (1933, p. 205, 

 figs. 5, 6) have not been observed. Eggs in coelom observed August 

 10, 1948. 



The brain is situated slightly forward of the nuchal organ, therefore 

 under the ridge of tissue connecting the bases of the two dorsal ten- 

 tacles. The anterior border is deeply notched and a tiny eye spot 

 is present on each side near the anterior margin. When the introvert 

 is retracted the brain is beneath a tough sheath of the united retractors. 



Color in life: "The ground color is deep buff marked by dark gray 

 grooves and lines, most of which are due to wrinldes produced in 

 contraction. The collar is smooth and whitish in appearance. The 

 conspicuous arborescent tentacles vary in color from pale yellow to 

 brown, red, or dark purple." (Peebles and Fox, 1933, p. 202.) In 

 alcohol the color is pale brown, dark on contracted area, with a 

 definite brown zone at anus; in formalin it is usually reddish brown. 



Type. — -Formerly in the Museum of Comparative Zoology but no 

 longer in existence. 



Type locality.- — Laguna Beach, Orange County, Calif. 



Distribution. — Point Conception, Calif., to Ensenada, Baja Cali- 

 fornia. 



Specimens examined. — From California: 



Near Point Conception, intertidal, Jul}' 14, 1916, C. L. Hubbs, 2 specimens. 

 Santa Rosa Island (Beechers Bay and mouth of Gavanon Canyon), Aug. 10, 1948 



(eggs), D. M. Wootton, 2 specimens. 

 Santa Barbara, tidal sand at Hendys Beach, Patrick H. Wells, 8 specimens. 



