434 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



while the author was a guest at these stations. They are now deposited 

 in the Allan Hancock Foundation. 



Distribution. — D. lunulatus was originally described from Key West, 

 Florida (Ehlers, 1887, p. 174) from 1-2 fms, and later recorded from 

 Puerto Rico by Treadwell (1901, p. 206). The present records include 

 Lemon Bay, Florida, and Beaufort, North Carolina, in intertidal areas. 



Dasybranchus glabrus Moore 

 Plate 57, Figs. 1, 2 



Moore, 1909, pp. 280-281, pi. 9, fig. 58; Treadwell, 1914, p. 212. 



Collections.— \025-39 (1); 1040-40 (1); 1193-40 (1); 1264-41 

 (1); 1297-41 (1); 1299-41 (1); others come from various parts of 

 California including Half Moon Bay south to Ensenada, Lower Cali- 

 fornia (about 12 individuals). 



D. glabrus is at once distinguished from other species with which it 

 may occur for having a thoracic region that is smooth except for wrinkles 

 of contraction between the segmental grooves. The branchiae are limited 

 to a posterior abdominal region; they are retractile and emerge from a 

 pore just above the neuropodium; they consist of 2 or 3 short, thick fila- 

 ments. In this respect, as also in the texture of the thoracic epithelium, 

 the species resembles D. lunulatus (see above). The prostomium is 

 broadly rounded at its anterior end much as in D. platyceps (pi. 55, fig. 

 1 ) and lacks visible eyespots ; the nuchal slits are in the usual position at 

 the posterior margin of the prostomium. Color in life is pale red. 



Abdominal hooks have a large, translucent hood that fits loosely about 

 the beak ; its free margin around the aperture is delicately toothed. The 

 shaft resembles that in other species of the genus ; the shoulder is thick and 

 the neck slender. The heavy fang is sunnounted by a crest of 3 partly 

 fused teeth with a broad, common base (pi. 57, fig. 1, 2). The shaft is 

 penetrated by fine fibrillae that extend from the base distally to the neck 

 and end abruptly. 



D. glabrus is clearly separable from D. lunulatus since the first lacks 

 pigmented prostomial eyespots. 



D. glabrus has been collected from interstices in a vermetid colony, 

 under stones and from black shales ; it may thus be associated normally, 

 with rocky areas rather than soft muds. 



