200 bulletin: museum of compaeative zoology. 



Amphisolenia quadrispina, sp. nov. 



Plate 14, Fig. 86. 



Body very long and slender, its length about 45 times the greatest dorso- 

 ventral diameter, attenuate, fusiform, expanding posteriorly to a knob-like 

 termination with four equidistant short incurved terminal spinules. Body 

 constricted immediately anterior to the knob. Midbody not sharply delimited, 

 about one third of the total length in length. Length of neck (girdle to fla- 

 gellar pore) 0.13 of the total length, or four to five dorso-ventral diameters of 

 the head without lists. Head capitate, transverse lists spreading, subhorizontal 

 with few fine ribs, width of lists equals the transdiameter of the head. Ter- 

 minal knob porulate. 



Nucleus elongated, many small spheroidal chromatophores. 



Length, 635-689 /*; dorso-ventral diameter of midbody, 14-17 /*. 



Stations, 4613, 4722. 



Amphisolenia quinquecauda, sp. nov. > 



Plate 13, Fig. 75. 



This is a large species resembling A. thrinax but having five instead of three 

 antapical ends. The neck and midbody form the apical third of the body, and 

 the branches begin with the antapical third. The neck is short, but little 

 longer than the dorso-ventral diameter of the midbody, which is stout, fusiform, 

 its dorso-ventral diameter but slightly exceeding its transverse diameter. 



The head is elongated, oblique, with spreading transverse lists heavily ribbed 

 with about 20 ribs. The axis in the posterior third bends ventrally in a 

 double curve and ends in a triangular antapex with short spinules on the 

 angles. There is a dorsal spine a short distance from the antapex. The four 

 branches are arranged in one plane in a single dorsal series and are all without 

 enlargements, slightly curved, with the convex side dorsal. The first branch 

 has an end similar to that of the axis, but the three slightly shorter ones of the 

 middle group have but two small terminal spinules. 



Nucleus elongated. Chromatophores small, elongated, very numerous. 



Length, 835 fi ; dorso-ventral diameter of midbody, 42 p ; length of first 

 dorsal process about 300 /a. — 



Station, 4739. 



Amphisolenia rectangulata, sp. nov. 



Plate 14, Fig. 83. 



A large species with short fusiform midbody, elongated oblique head, and 

 much elongated antapical stem with very slight ventral curvature. The 

 antapex terminates with very slight enlargement in rectangular form with the 

 major axis dorso-ventral, and an acute spinule on each corner. 



Nucleus much elongated ; chromatophores spheroidal, numerous. 



