"^o^- ^] Kofoid. — Triposolenia. 105 



length is about 0.25 of the total length. The head is capitate with 

 flat or impressed furrow and low convex epitheca. 



The antapicals arise from the postero-lateral regions of the 

 bicornis group. The ventral is a little longer than the dorsal. 

 They diverge postero-laterally for a short distance and then bend 

 somewhat abruptly in a localized major flexure to a posterior 

 direction. The greatest distance between horns is 3.5 and be- 

 tween the tips 3 times the altitude of the midbody. Distally they 

 exhibit a slightly developed sigmoid flexure in lateral view. In 

 dorso-ventral view both horns are bent to the right proximally 

 and distally to the left, the dorsal horn having more distal curva- 

 ture than the ventral. The antapical tips are truncated in dorsal 

 or ventral view, with minute lateral terminal spinules. In lateral 

 view the tips are somewhat rounded. There are several scattered 

 tubercles on the outer margins of the horns. 



The thecal wall is hyaline, structureless, with a few pores 

 along the midventral line of the neck and in the tubercles of the 

 antapicals. 



A large nucleus is found in the midbody, along with principal 

 and accessory vacuoles and a few minute scattered spheroidal 

 chromatophores. 



Dimensions: Lenth, 100-122 /x; altitude of midbody, 22-28 

 fi; length of antapicals, 48-70 fi. 



Taken in a vertical haul from 95 fathoms off San Diego. 



Triposolenia bicornis sp. no v. 



PI. 15, figs. 1, 2. 



A species 'resembling T. truncata but less robust, with longer 

 antapicals, with tuberculated major flexures and rounded tips 

 and capitate head with convex epitheca. 



The midbody resembles that of T. truncata, Avith the exception 

 that its margins are often more convex, giving it a slightly more 

 rotund appearance. 



The antapicals arise in the same manner as in T. truncata and 

 exhibit the same balanced relation with respect to each other and 

 the same proportion to the anterior process. Both antapicals 



