280 PROCEEDINGS OP THE ACADEMY OF [April, 



the inter-notopodial interval on anterior segments and nearly twice 

 as great on XII. 



Abdominal segments about half as long as thoracic, usually irregu- 

 larly biannulate, thickly glandular anteriorly but (except at the tori) 

 becoming thin-walled posteriorly. Neuropodial tori extensive low 

 ridges, reaching on anterior segments from above the middle level 

 nearly to the neural line, but posteriorly scarcely half as long. They 

 become more elevated dorsally and end abruptly in a prominence, 

 above which is the small but distinct rounded ovoid lateral organ. 

 The very small notopodial tori are dorsal and connected across the 

 dorsum by a low transverse fold. Posteriorly they become very 

 obscure. 



Branchiae are retractile and usually obscure anteriorly; on middle 

 and posterior abdominal segments they become conspicuous bushy 

 tufts composed of numerous (about 20-30) filaments arising from 

 the posterior end of the notopodial tori, or posteriorly, where the tori 

 become obsolete, replacing them. 



Abdominal lateral organs are distinct only posteriorly where the 

 tori become widely separated, appearing halfway between them as 

 small rounded elevations, above and below which a few small papillae are 

 scattered. Thoracic lateral organs and genital pores were not observed. 



The original drawings of crochets of this species were made from 

 imperfect specimens and a corrected representation is shown in fig. 57, 

 Plate IX. 



Six specimens of this species, one of which is 6 mm. in diameter, 

 occur in the Starks collection and were taken at San Diego between 

 tides. 



Dasybranchus glabrus sp. nov. (Plate IX. fig. 58). 



Body moderately stout, terete, and thickest anteriorly where it is 

 shaped much like a small earthworm; posteriorly more slender and 

 gently tapered, subquadrate, flattened below. The type and only 

 specimen is 45 mm. long with a maximum diameter of 2.4 mm. 

 Thoracic segments 14, abdominal 157. 



Prostomium partially retracted within the collar-like anterior 

 border of the peristomium, the exposed part bluntly rounded anter- 

 iorly with a slight ventral longitudinal furrow. 



Peristomium a long, deeply biannulate segment (perhaps two seg- 

 ments) as long as any two of those following; the first ring is marked 

 by several shallow furrows. Entire thorax with firm, smooth, thickly 

 glandular walls, with very few markings; the segments all uniannulate 



