NO. 1 HARTMAN : POLYCHAETOUS ANNELIDS 29 



Lepidonotus pilosus Treadwell, 1937, pp. 141-143, pi. 1, figs. 1-7. 



Collections.— U2-3A, 211-34, 245-34, 251-34, 264-34. 7 specimens. 



Lepidonotus (Physalidonotus) barhatus Augener was described from 

 a single specimen questionably attributed to the north Pacific. The same 

 author considered the specimen close to Lepidonotus chitoniformis 

 Moore. The latter is, however, a Euphione (Seidler, 1924) and indige- 

 nous to the northwest Pacific. 



Lepidonotus pilosus Treadwell was described from the southern end 

 of the Gulf of California, Mexico. It has branchiae on the elytrophores, 

 hence a Chaetacanthus; the elytra are heavily fringed and the notopodial 

 and neuropodial setae agree with those in C. magnificus (Grube). 



Distribution. — ^West Indian region; Panama; eastern Pacific from 

 Ecuador north to the Gulf of California. Widely distributed in warm 

 and tropical seas. Intertidal to 40 fms. In coral and rock crevices. 



Genus ARGTONOfi Chamberlin 



Consists of a varying number of segments, to 60 or more. Elytra 

 continued to end of body but often leaving a broad dorsal area exposed. 

 Inserted as in Halosydna Kinberg on the first 26 segments, insertion 

 more or less irregular on more posterior segments. Last few pairs of 

 elytra sometimes so small as to be made out with difficulty. Prostomium 

 lepidonotoid, but lateral antennae inserted subterminally, and eyes much 

 reduced in size. Parapodia subbiramous, the notopodium reduced, with 

 an aciculum and a few serrated setae; neuropodium robust, its setae 

 stout, falcate, often few in number, with serrations obscure or absent. 



Arctonoe vittata (Grube) 

 Plate 3, Figs. 33-37 



Polynoe vittata Grube, 1855, p. 82-83. 

 Lepidonotus lordi Baird, 1863, p. 107. 



Halosydna lordi Baird, 1865, p. 190-191; Moore, 1908, p. 330. 

 Polynoe lordi Johnson, 1897, pp. 175-177, pi. 7, figs. 35, 44; pi. 8, figs. 

 51-51b; 1901, pp. 388-390. 



