438 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Pouchetia alba sp. nov. 



Plate 11, figure 121 ; text figure PP, 8 



Diagnosis. — Small species with ovoidal body, enlarged posteriorly, its length 

 1.3 transdiameters ; girdle 1.5 turns around body, displaced about 0.6 total length 

 of body; torsion 0.5 circumference; ocellus irregular, compound, situated far 

 posteriorly; lens dotible; amoel)oid melanosome and scattered black pigment. 

 Length, 45/*. Pacific off La Jolla, California, July. 



Description. — The body is small, ovoidal with the longest transdiameter posterior to the 

 middle of the body and nearlj^ circular in cross-section. The epicone is somewhat smaller than 

 the hypocone, is symmetrically rounded near the apex, and has a length of about 0.3 of the 

 total length of the body on the left and of about 0.S8 on the right side of the sulcus. The 

 hypocone is broadly rounded, flattened on the antapex and deeply excavated on the ventral side 

 by the posterior end of the sulcus. 



The girdle joins the sulcus at a point distant from the apex 0.3 of the length of body, sweeps 

 around the body posteriorly 1..5 times and joins the sulcus distally 0.2 of the total length from 

 the antapex. The anterior flagellar pore is found at the proximal junction of the girdle and 

 sulcus, and the posterior flagellar pore slightly beyond the distal junction on the opposite face 

 of the body from the anterior pore. The transverse flagellum traverses nearly the whole length 

 of tlie girdle. 



The sulcus begins midway between the anterior flagellar pore and the apex without a 

 terminal loop, curves regularlj' around the body 0.-5 its circumference and is continued beyond 

 the posterior flagellar pore to near the antapex as a deep trough. 



The ocellus is situated at the right of the distal end of the sulcus and the posterior flagellar 

 pore, and is directed obliquely anteroventrally. It has a compound, colorless lens, composed of 

 two ovoidal masses of hyaline material with concentric lines only faintly indicated. It is crossed 

 by the distal end of the girdle. The lens is large, being 0.3 the total length of the body in length, 

 its cross-diameter being 0.3 its own length. The two component moieties are obliquely flattened 

 against each other. Adjacent to the base of the lens is a small, spheroidal, denser part of the 

 black melanosome surrounding a very minute central core. Around this, partially covering 

 the posterior part of the lens and scattered through the distal third of the liypocone, is a loose 

 mass of black granules which exliibit amoeboid changes of position. A detached mass of black 

 pigment and several granules lie near the anterior flagellar pore. 



The nucleus is situated in the epicone, an almost spherical body with a diameter of 0.7 

 transdiameter. Numerous chromatin strands traverse it in an anteroposterior direction. 



The pusules were evident. The cytoplasm is finely granular and transparent, with few 

 alveoli or large granules present. Small greyish refractive bodies were situated in the epieone 

 with several large oil globules and greenish food vacuoles posteriorly. Tlie surface of the body 

 lacks striae or other markings and there are no peripheral vacuoles. The color is a pale viridine 

 yellow diffused throughout the plasma. 



DiMEXSioxs. — Length, 45-50/*; transdiameter, 30-35/*; dorsoventral diame- 

 ter, 35/*: nucleus, 30/*. 



AcxrV'iTiES. — A normally active individual moves anticlockwise in large 

 circles, with rapid, slightly jerking motions. 



OccuKEEXCE. — Two individuals were seen. These were taken in a Xo. 25 

 silk net in the Pacific Ocean off La Jolla, California, on July 12 and 17, 1917. 

 The hauls were made from a depth of 80 meters to the surface and in a surface 

 temperature of 20-5 C. 



