AOTEROIDEA "I WORTH PACIFIC \M> ADJACENT WATERS ll-li; 51 



lobed and form a zigzag or sinuous series. Thesu] 



are rather regularly four lobed, with longer dorsoventral than longitudinal lo 

 The dorsolateral skeleton is composed ol irregular plates, rodlike, oblong, Bpatu 

 Btraight, bent, or irregularly three lobed, l>ui with the long axis trai 



pi in the case of a few connecting plates between the consecutn 

 thickness of these plates there is a difference of fully 100 per cenl between -. 

 from station 3252 and 3506, those from the latter having a heavy skeleton 

 smaller mesh 



The skeleton is not basically unlike thai of other Bpecies, and certainly no1 

 greatly unlike thai of /-. mHUeri the type of : The development of 



dorsolateral papular areas or meshes in the skeletal reticulum musl be regarded rather 

 us specific than generic, and is associated with the mostly transverse dorsolateral 

 ossicles, which Yen-ill believed to l>e of generic importance {Ctenast 



Internal anatomy.- The testes have the usual Leptasterias form, and when fully 

 developed till must of the coelomic cavity of the disk and rays, impinging upon the 

 stomach, and occupying all available space between the dorsal and ventral divisions. 



They press the hepatic c a againsl the dorsal body wall, and reach three-fourths 



the length of ray measured <>n side. Bach is roughly spindle-shaped, and cons 



central canal or n\\<, from « hich branch off a number of very it regularly lobulated 

 major divisions usually toward the mesial line of ray I and numerous \ ery irregular, 

 subdivided, small lulus which fill in pretty much all the available space. The 

 passes downward ahout opposite the first Buperomargina] plate, and opens l>y a 

 pilla, on the actinal surface, close to the interradial line. There are usually. h< re, 



one to three large lanceolate straight pedicellariae. The dud has ciliated epithelial 



lining I Lieberkind i. 



The ovaries are vny similar to th08e of other s|)e. 



They w ere found to he full of large and small ■yt«s at the same time' that the young, 



nearly ready to shift for themselves, were still being carried by the mother. 



Lieberkind found a specimen with nine ovaries, while the tip of the tenth was 

 hermaphroditic, the e_"_'s lying along the wall and the spermatozoa in the middle. 

 (1920, fig. 4, p. 12 



The Stomach is of the usual four, and very spac ioU8 in the female by whom 



used as a brood pouch. The intestinal co« um is rather triangular in genera] form 

 with three thick lohes radiating from the- base, the whole about one half r in lenj 



The hepatic coca ale largl and extend well toward the extremity of the- i 



Ciin of /In young. 1 * Th< fter ciiic-irin.' from tl . which • 



Yclitrally B8 in other species of /., ptast* 'as, are probably kept for a short time under 



tin- disk. It is usual for Bpecies of Leptasterias to form a temporary nursery by 

 drawing tin- rays together and raising the disk. Fertilization probably tal 



while the eggs are here. They are then taken into the Stomach, wl, lopment 



imens from Plover Kay. with short tumid rays and with K only 12.6 



mm., are already carryin rela- 



tively very large, measuring 0.8 to l mm. in >' 



