188 bulletin: museum of comparative zoology. 



Esophageal blood lacunae large and conspicuous, surrounding 

 esophagus on tliree sides. 



NephrkUa consist of a single large longitudinal canal on each 

 side in the middle esophageal region, which branches only in its 

 anterior portions and has a single efferent duct at its posterior end. 



Cephalic glands are but little developed ; cutis glands are limited 

 to outer portion of outer longitudinal muscular layer, except that 

 for a short space near posterior end of stomach region they sink 

 nearl}'^ to the circular nmscles. 



A remarkably well developed inner circidar muscle surrounds the 

 posterior portion of esophagus as in the preceding species, but ceases 

 abruptly at the very Ijeginning of intestinal region. The main cir- 

 cular muscular layer thickens very considerably in the same region. 



Habitat. — Under stones between tides ; common throughout 

 southern Alaska as far west as Prince William Sound. Nearly 

 50 individuals, some of which were upwards of 30 cm. in length, 

 were found twisted together in a tangled mass in a single cavity in 

 coarse gravel at Sitka, Alaska. All were filled with ripe sexual 

 products in June (Coe, :01, p. 74). Several individuals of large 

 size, measuring 20 to GO cm. each, when well extended, were col- 

 lected by Mr. A. J. Carlson at Pacific Grove, California. In these 

 the sexual products were immature, and the woinis were deep, rosy 

 flesh color or deep pink ; paler and duller beneath. Color resem- 

 bles that of Paranem,ertes carnea (Coe, : 01, PI. Ill, figs. 3, 4) very 

 closely. Not common at Pacific Grove, aiid found oidy at extreme 

 low water in crevices of rocks. 



At San Pedro, California, the species is fairly common in certain 

 sandy localities on the flats of the harbor at extreme low tide, but 

 the specimens secured were but a small fraction of the length of 

 the large individuals found farther north on the California coast. 

 The average length at this locality was but 7 to 10 cm. 



The present known range of the species is thus from San^Pedro, 

 California, to Prince William Sound, Alaska - — a distance of about 

 2,500 miles. 



29. Micrura griffini, sp. nov. 



Body of rather large size for genus, rather slender, rounded in 

 esophageal region, much flattened posteriorly, but witliout thin lat- 



