﻿SIPUNCULID WORMS OF CALIFORNIA — FISHER 406 



the tentacles are simpler. Each of the four primary tentacles divides 

 into two elongate branches, along the sides of which the tentacules 

 are arranged pinnately. 



Alost of the species I have examined have three or four short trans- 

 verse muscle bands in front of the nephridia. 



Under existing rules of nomenclature the correct name of this 

 genus is not Dendrostoma, which is an emendation of Grube's earlier 

 Dendrostomum. 



KEY TO KNOWN SPECIES OP DENDROSTOMUM 



a*. Hooks or spines on introvert, or at its base; two retractor muscles. 

 6'. Polian tubules very long. 



c'. Tentacles arising from 4 stems, branching dichotomously several times. 



pyroides Chamberlin 

 c^. Tentacles arising from 4 stems, each with 2 branches along which the 

 ultimate tentacules are arranged pinnately; introvert papillae incon- 

 spicuous blandum Selcnka and dc Man 



c*. Tentacles 4, somewhat palmate, divided into 2 or 3 stems, along which 

 the ultimate tentacules are arranged; 6 tentacles according to Gerould, 



1913 alutaceum Grube 



c*. Tentacles 6 hexadactylum Sato 



c*. Tentacles 8, divided each into 2 near base; spines at base of introvert 



only spinif er Sluiter 



6^. Polian tubules very short. 



c'. Polian tubules unbranched; tentacles 4; hooks 50db minor Ikeda 



c^. Pohan tubules branched; tentacles 5 or 6; hooks few. 



signifer var., Selenka and de Man 



a^. Hooks on introvert; 4 retractors; 6 tentacles piimifoliura Keferstein 



a^. No hooks on introvert; 2 retractors. 



b^. Anus and nephridiopores on nearly same level, 

 c*. Polian tubules very long; 6 tentacles. 



d'. Esophagus with numerous pointed protuberances on its wall arranged 

 in long series; 4 intestinal fixing muscles; small species. 



peruvianum Collin 

 (P. Esophagus without pointed protuberances, fixing mu.scles 3 or less; 

 large slender species. 

 e'. Intestinal spiral of moderate length, with less than 50 coils (usually 

 15 or 16 double coils); fixing muscles present; Polian tubules 

 more than 10. 

 P. Fixing muscle F^ attached to postesophageal intestine; retractors 

 attached one-fourth to one-third body length from end. 



zostericolum Chamberlin 

 ^. Fixing muscle F^ attached to intestine; retractors attached one- 

 fifth to one-sixth body length from end. 



dyscritum, new species 

 e^. Intestinal spiral very long with upward of 100 coils; fixing muscles 



usually absent; Polian tubules 9 or 10 perimeces Fisher 



c^. Polian tubules very short. 



d'. Tentacles 4; Polian tubules unbranched. 



e'. With elliptical glands ellipticura Sato 



e^. With circular glands tropicum Sato 



d^. Tentacles 5 or 6; Polian tubules branched. 



signifer Selenka and de Man 



