﻿SIPUNCULID WORMS OF CALIFORNIA — FISHER 415 



San Clemente Island, June 20, 1896, H. B. Torrey, 3 specimens. 



Newport Bay, in sand under rocks, January -February 1930, G. E. MacGinitie, 



9 specimens. 

 Newport Bay, Corona del Mar, open rocky shore und(!r rocks, Jan. 5, 1936, 



1 specimen. 

 Anaheim Slough, Oct. 12, 1932, G. K. MacGinitie, 4 specimens. 

 La Jolla (Bird Rock), P^arl H. Myers, 4 specimens. 

 San Diego, E. C. Starks, 2 specimens. 



From Baja California: 



Ensenada, among eelgrass roots; in gravel and sand \inder boulders; rocky tide 

 flats, in sandy mud at lowest part of intertidal zone; midwinter, G. E. 

 MacGinitie and E. F. Ricketts, 117 specimens. 



Remarks. — The species is probably the North American equivalent 

 of Dendrostomum peruvianum Collin (1892, p. 179, pi. 11, figs 7 and 

 13), Callao, Pern. The two types were only 25 and 30 mm. long; 

 tentacles four, and esophagus posterior to the end of the contractile 

 vessel carries relatively conspicuous slender protuberances arranged 

 in longiseries. The nephridia are short. Fixing muscles F^ F^ 

 and F^ are essentially as in zostericolum, but there is an F* attached 

 to the gut spiral back of F^. The dermal glands are similar to 

 those of D. zostericolum in being low papilliform on the introvert. 

 Further study of peruvianum will possibly change the tentacle count 

 from four to six. In ni}^ small zostericolum the two smaller dorsals 

 can be considered branches of the adjacent larger tentacles, which 

 would give a count of four primaries. D. zostericolum does not 

 possess at any age an F'* fixing muscle or prominent protuberances 

 on the postesopbagus. The nephridia in extended young specimens 

 are long, reaching to the origin of the long retractors. 



Dendrostoma mytheca was based on a 20-mm. specimen from Laguna 

 Beach that is no longer in existence. The trunk measured 12 mm., 

 introvert 8 mm. The body was widest at the posterior end. The 

 principal characteristic is a "band of abruptly much larger tubercles 

 about the base of the mtrovert, distad of which region they become 

 again abruptly smaller"; the number of tentacles was not given. 

 This may well have been a young Dendrostomum zostericolum, most 

 of which have the enlarged glands, or even an immature pyroides 

 (without hooks), which has a zone of larger brown glands at the anus. 



DENDROSTOMUM PERIMECES Fisher 



Plate 27, Figure 3; Plate 28, Figure 1; Plate 30, Figure 4; Plate 33 

 Dendrostoma perimeces Fisher, 1928, p. 196, pi. 6, figs. 3, 3a; pi. 7, fig. 1; pi. 8, 

 figs. 2, 2a. 



Diagnosis. — Very long and slender; tentacles six, bushy; no hooks 

 on introvert. Similar in general habit to Dendrostomum zostericolum, 

 but even longer ; differing in having more numerous introvert papillae, 

 which do not thin out forward and do not diminish so conspicuously 

 in size; body glands convex, of two or three sizes; collar not obviously 

 reddish or purplish ; fewer (6 to 9) Polian tubules at end of contractile 



