Vol. 3] Kofoid. — Triposolenia. 107 



to 50 /A ; dorso-ventral diameter of midbody, 32 to 48 ju, ; length of 

 horns, 45 to 95 /u, ; rarely 130 /x. 



Taken frequently in small numbers in vertical hauls from 

 135-30 fathoms to the surface, and rarely in surface catches off 

 San Diego. 



\ 



Triposolenia ramiciformis sp. uov. 



PL 17, fig. 8. 



A grotesque species of slender habitus, with midbody pendant 

 from the base of the dorsal antapieal horn, convex epitheca and 

 capitate head, elongated neck, and elongated basally spreading 

 antapicals, with tuberculate major flexures and pointed ends. 



The midbody of this species is laterally compressed, sack- 

 shaped in lateral view with broadly rounded antapex, usually 

 tapering but little till near the antapex, though several specimens 

 have been seen in which the midbody tapers gradually from the 

 base of the antapicals to the more narrowly rounded apex. The 

 length of the midbody along its major axis is 1.67 (1.5-2.0, rarely 

 2.5) times the mean dorso-ventral diameter and 1.15 (1.1-1.3, 

 rarely 1.7) times the distance between the bases of the horns. 

 The main axis of the midbody is oblique to that of the neck, the 

 angle of divergence being 12°-25°. 



The two antapicals emerge from the midbody, not from the 

 posterior part as in T. truncata and T. hicornis, but from the 

 anterior angles. The ventral horn and the anterior projection 

 emerge together from the ventro-anterior angle and the dorsal 

 one from the dorso-anterior angle. The ventral horn is slightly 

 anterior to the dorsal one, so that the anterior margin is some- 

 what oblique to the main axis of the midbody. It usually has a 

 small convexity nearer the base of the dorsal horn. 



The two horns are subequal and subsymmetrical with respect 

 to the midbody, the ventral is usually a little longer than the 

 dorsal. In length the ventral horn is 2.9 (2.5-3.3), and the 

 dorsal 2.7 (2.5-3.2) times the altitude of the midbody in its main 

 axis. In a few cases the dorsal horn is the longer. The horns 

 are of fairly uniform caliber throughout, the length of the ven- 

 tral being 21^28 times its width. The tips are bluntly pointed. 



