kofoid: new species of dinoflagellates. 197 



Length, 1200 /x; dorso-ventral diameter of the midbody 60 /x; length of 

 head, 190 fi. 

 Station, 4732. 



Amphisolenia bispinosa, sp. nov. 



Plate 14, Fig. 85. 



A moderately large species of robust proportions, midbody but little expanded 

 and tapering very gradually into the antapical stem, which is slightly curved 

 ventrally and bears two very long attenuate spines, one upon each side. The 

 antapex is porulate, and several sinuous ridge-like markings are found on the 

 short neck. The head is elongated, oblique, with spreading lists with few 

 ribs. 



Nucleus much elongated. Chromatophores numerous, ellipsoidal. 



Length, 670 /x ; dorso-ventral diameter of midbody, 20 /x. 



Station, 4605. 



Amphisolenia brevicauda, sp. nov. 



Plate 13, Fig. 79. 



A very small species with elongated midbody and very short, straight, simple 

 antapical. 



The head is oblique, elongated, its length 2.5 times its dorso-ventral thick- 

 ness. The neck is long and slender, its length 0.25 of the total length. The 

 midbody is greatly elongated, slightly enlarged posteriorly, its length 0.5 of 

 the total length, contracting abruptly to a short antapical extension whose 

 length is less than that of the neck. The antapex is acute, without spines or 

 modifications. 



Length, 200 p; transdiameter of midbody, 12 /x. 



Station, 4740. 



Amphisolenia clavipes, sp. nov. 



Plate 14, Fig. 90. 



A small but robustly proportioned species with small capitate head, long 

 neck, tapering fusiform midbody not sharply delimited posteriorly. The ant- 

 apex is bent abruptly to the right for a distance about equalling the greatest 

 transdiameter of the midbody and terminates in a slight knob-like expansion 

 with a dorsal and a ventral spinule. 



Nucleus much elongated, chromatophores elongated, cylindrical. 



Length, 235 /a; dorso-ventral diameter of midbody, 13 fx. 



Station, 4736. 



Amphisolenia cur vat a, sp. nov. 



Plate 14, Fig. 87. 



A stout species of medium size, with cushion-shaped head, fusiform body, 

 and an antapical stem ventrally curved throughout, without terminal expansion. 



