264 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



base of the conical protoi)lasmic mass, and eventually all the other 

 connections are severed. The ovum is now attached by a broad 

 stalk to the base of the follicle (PI. 20, fig. 126), and is separated 

 from the rest of the follicle by a nan-ow cavity. The germinal ves- 

 icle and the yolk-nucleus are always situated near the point of 

 attachment (PI. 20, figs. 125-127). 



With the growth of the ovum the wall of the follicle likeT^dse 

 increases in thickness, and the cytoplasmic substance becomes much 

 vacuolated with food materials for the ovum. At the region where 

 the ovum is attached these small food vacuoles come directly into 

 its substance in the vicinity of the yolk-nucleus (PI. 20, fig. 127). 



The yolk-nucleus gradually decreases in staining power after the 

 accumulation of much yolk in the ovum, and at the same time a 

 great increase in the number of nucleoli in the germinal vesicle 

 takes place. The follicular nuclei increase rapidly in number, and 

 fill up the apex of the follicle (PI. 20, fig. 127). But as the ovum 

 approaches maturity, tlie follicular walls decrease in thickness by 

 absoi-ption into the ovum itself. Most of the cytoplasm about the 

 nuclei in the apex of the follicle is likewise absorbed. 



The stalk supporting the ovum is gradually constricted off, the 

 ovum falls into the cavity of the follicle, and is doubtless discharged 

 through the apex of the follicle and through the body Avails, as in 

 other species. So far as this individual shows, the egg follicles 

 develop only in the dorsal portion of the body, and the oviducts all 

 open on the dorsal surface. 



Habitat. — The single specimen found in these collections was 

 dredged by the Albatross, Aug. 9, 1888, in Lat. 56" 0' N., and 

 Long. 154° 20' W. (Sta. 2853, southwest of Kadiak Island, Alaska), 

 at a depth of 159 fms. The bottom of this station was of gray sand, 

 and the tempei'ature 41° F, 



64. Amphiporus californicus, sp. nov. 

 PI. 23, figs. 172-176. 



Body of moderate proportions or somewhat thickened ; resembling 

 A. angulatus in general shape. Length commonly 10 to 25 mm. or 

 more ; width 2 to 3 mm. A small individual was only 6 mm. long 

 and 1 mm. wide. 



