198 bulletin: museum of comparative zoology. 



A single small terminal spinule occurred on the left valve of individual drawn. 

 Transverse lists low, spreading with few stout ribs, one of which passes clown 

 upon the side of the neck. The antapex is porulate and bears a few irregular 

 reticulations on the thecal wall. 



Nucleus small, broadly ellipsoidal. Chromatophores numerous, spheroidal. 



Length, 460 //. ; dorso- ventral diameter of midbody, 35 p. 



Station, 4605. 



Amphisolenia dolichooephalioa, sp. nov. 



Plate 13, Fig. 83. 



A large species with long very slender body with slight dorsal convexity. 

 Head oblique, greatly elongated, its length nearly seven times its transverse 

 and ten times its dorso- ventral diameter. Lists nearly horizontal, with 

 numerous fine ribs. Neck about as long as the head, midbody tapering, fusi- 

 form. Antapex curved somewhat ventrally and to the right, with subcapitate 

 termination bearing two straight spinules at the suture and decurrent hyaline 

 ridges which pass quickly from the knob-like end to the slender cylindrical 

 stem. 



Nucleus greatly elongated. 



Length, 1050 \i ; dorso- ventral diameter of midbody, 22 p ; length of head, 

 82/i. 



Station, 4728. 



Amphisolenia extensa, sp. nov. 



Plate 13, Pig. 78. 



A very large species with flattened very oblique head, relatively short neck, 

 stout fusiform midbody and an enormously elongated antapical stem which is 

 six times the length of the rest of the organism. The head is flattened ellip- 

 soidal, with low spreading lightly ribbed transverse lists, a ribbed furrow, and 

 coarsely ribbed longitudinal lists. The antapical stem is slightly convex dor- 

 sally and terminates in a slightly swollen subtruncate antapex without spines. 



Nucleus elongated, chromatophores numerous, subspheroidal. 



Length, 1380 p ; dorso-ventral diameter, 25 p. 



Station, 4699. 



A mphisolenia laticincta, sp. nov. 



Plate 13, Pig. 80. 



A minute species with straight fusiform body. Head obliquely rounded, 

 transverse furrow very wide, equalling the long axis of the head in width. 

 Transverse lists- low, spreading, with few faint ribs. Neck short, slightly ex- 

 ceeding the dorso-ventral diameter of the midbody in length. Midbody fusi- 

 form, forming nearly half of the total length. Antapical stem straight, with a 

 single terminal spinule. 



Nucleus elongated, chromatophores small, irregular. 



