190 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



San Pedro, California, living in sand on the flats of the harbor. 

 They are not common in the localities visited. 



This form resembles M. alaskensis which is found in the same 

 locality, but its deep reddish color and absence of accessory buccal 

 glands will distinguish it from the latter. ^Fhe resemblance to 3f. 

 leidyi of the Atlantic coast is very close in size, form, habits and 

 color. It differs, however, in size of caudal cirrus, color of ))robos- 

 cis, relations of cephalic blood lacunae, character of nephridia, and 

 other minor peculiarities. 



30. Micrura nebulosa, sp. nov. 



Body of small size, rounded, thickest in anterior portions after 

 preservation ; head broad, not demarcated from body ; cephalic 

 furrows of moderate length, joining proboscis pore in front when 

 head is partially contracted ; mouth small, situated as far back as 

 posterior ends of cephalic furrows. 



Length of single preserved specimen 25 mm. ; width 2 mm. 



Color. — In the preserved specimen the coloi- resembles that of 

 the dorsal surface of Aivphiporus nebulosus (Coe, :01, PI. 4, tig. 

 1). The whole sui-face of body both above and below is thickly mot 

 tied with coarse brownish blotches on a grayish ground color. Pos- 

 teriori}' the blotches fuse together to form a nearly continuous 

 brownish color, through which the grayish ground color ajipears 

 only at intervals. 



Ocelli apparently wanting. 



Proboscis sheath peculiar in that its internal longitudinal muscles 

 are represented by two broad bands on ventral side instead of form- 

 ing a com))lete cylinder as in related species. The rhynchocoel 

 vessel, which is of remaikably large size, lies between these two 

 muscular bands. The sheath does not reach quite to posterior end 

 of body. 



Cejohalic glands very abundant, occupying tissues of head inward 

 nearlv to rhvnchodaeuin. They are thickest, however, in dorsal 

 half of head, and cease entirely some distance in front of brain. 



Cutis (/lands mostly limited to outer half of outer longitudinal 

 muscular layer. 



Inner circidar muscles very highly developed, becoming for a 

 very short distance immediately in front of intestinal region nearly 



