252 



Ajinelida Chatopoda 



laterally, flattened above ; the posterior third ia thin, 

 flattened both above and below. 



Color : first third white ; middle third brovm, semi- 

 transparent ; last third white ; or the anterior third may 

 be light flesh color, posterior two-thirds yellowish ; bran- 

 chiae red. 



Found occupying tortuous galleries in compact bivalve 

 shells. In some respects this form agrees with P. hoplura 

 Clpd.. but is not identical with it. 



POLYDOEA C^CA U. Sp. 

 PLATE IX, FI&S. 11&-122, 



Head emarginate in front; lateral lobes bluntly rounded, 

 short, no eyes. A rounded carination extends from the 

 head to the anterior margin of the 4th segment. 



Tentacles, mere threads ; in extension from 10 to 12"^ 

 long, white, canaliculated ; margins of channel flake-white, 

 interrupted by thirteen transverse dark purple lines, which 

 reach about half-way around the tentacles. Length of 

 markings to spaces included between them about as 1 to 3. 



First segment with dorsal ramus only: ramus small 

 and with shorter setae than those of the foUowino: seorments. 



Second, third and fourth segments with short, blunt, 

 flnger-shaped dorsal and ventral cirri. 



Branchiee begin on 7th segment, are of the ordinary 

 form, but very numerous, existing on over 100 segments. 

 The last three are very short, and are followed by sixteen 

 segments without branchiae. 



Terminal sucker funnel-shaped, interrupted below ; anal 

 opening with crenulated margin. 



Setae. Very numerous in anterior dorsal rami : some 

 very long, at least one-half longer than the branchite. 

 These long setae for the most part have the form shown in 

 f. 119, but some are narrower. In the upper part of the 

 bundle are shorter setae (f. 120). 



