NO, 1 HARTMAN : POLYCHAETOUS ANNELIDS 191 



Dorvillea rudolphii (delle Chiaje) 



Staurocephalus rudolphii Fauvel, 1923, pp. 446-447, fig. 178; Monro, 

 1933, pp. 92-93. 



Collection.— A 32-39 (1). 



The distribution and synonymy of this species have been discussed by 

 others (Fauvel, 1923, p. 447, Monro, 1933, p. 92). It is believed to in- 

 clude S. pallida Verrill, perhaps S. polydonta Verrill, and S. longicornis 

 Ehlers. 



Distribution. — West Indian and Caribbean seas; eastern Pacific; in 

 shallow seas and intertidal. 



Genus OPHRYOTROGHA Claparede and Metchnikoff 



Type O. puerilis Claparede and Metchnikoff 



Ophryotrocha puerilis Claparede and Metchnikoff 



Plate 15, Figs. 325-330 



Fauvel, 1923, pp. 450-451, fig. 180; Augener, 1936, p. 349; Hartmann 



and Huth, 1936, pp. 389-439, 17 figs. 

 O.sp. Coe, 1940, p. 177. 



Collections. — La Jolla, California, and Beaufort, North Carolina. 



A species of this genus, believed to be the widely known O. puerilis, 

 has been found to occur on both east and west coasts of America. The 

 total length of about 23 segments is only a few mm. Color in life is pale 

 flesh. The prostomium and body segments are surrounded by rows of 

 cilia (pi. 15, fig. 325), but the prostomial antennae are inconspicuous. 

 The maxillary apparatus is dark brown, chitinous. The mandibles consist 

 of a pair of bifurcated pieces (pi. 15, fig. 327), the distal ends delicately 

 crenulated (pi. 15, fig. 328), the posterior parts long, slender. Maxillae 

 consist of a pair of strong forceps (pi. 15, fig. 327) and plates. The lat- 

 ter are of 2 kinds, including 3 pairs of sharply dentate ones basally and 

 4 pairs of delicately crenulate ones distally (pi. 15, fig. 326). 



The first 2 segments are apodous; the next has parapodia provided 

 with single superior and inferior setae and 2 median ones (pi. 15, fig. 

 330). All other parapodia have one or a few superiormost capillary setae, 

 3 or more compound setae (pi. 15, fig. 329) in the middle part of the 

 fascicle, and 2 or a few inferiormost capillaries. 



The interesting phases of sexual reversal (Hartmann and Huth, 1936, 

 and Coe, 1940) have been the subject of illuminating experimentation. 



Distribution. — Cosmopolitan, in warmer waters. Contamination in 

 culture tanks at the Scripps Institution of Oceanography, at La Jolla, 

 California; among debris and attached organisms, in intertidal zones; 

 Beaufort, North Carolina. 



