448 MEMOIRS OP THE UNIVERSITY OF CALIFORNIA 



DiMEN^sioxs. — Length, 53-58/*; transdiameter, 37-44/*; axes of nucleus, 

 19-35/* and 10-18/*. 



OccTKEEXCE. — Two individuals were taken July 26. 1917, 2.5 miles off La 

 Jolla, California, with a Xo. 25 silk net in a haul from 80 meters to the surface 

 and in a surface temperature of 21 °4 C. On July 23 another indi\ndual was 

 taken at approximately the same place and with the same apparatus, the surface 

 temperature heing 20?2 C. 



AcxrviTiES. — One individual seen was still active and circled feehly on the 

 substrate in narrow, anticlockwise spirals with spasmodic jerks, due probably 

 to intermittent adhesions of the flagellar apparatus. 



CoMPAEisoxs. — This species is a generalized member of the subgenus P ou- 

 ch eti ell a, which has a concentrated or integrated ocellus. In the posterior 

 location of the ocellus, its horizontal axis, and the presence of an antapical lobe 

 or process, it is like Proterythropsis crassicaiidata and also possesses in com- 

 mon with it distributed j)eripheral granules of pigment. In the latter species, 

 however, the pigment is red instead of black and is less abundant with more of 

 a linear distribution, the lens is more distinctly lobed, and the antapical process 

 much longer. The linear form of the distributed jieripheral pigment is ahnost 

 identical with that in Protopsis nigra (Pouchet, 1887, pi. 10, fig. 2). 



Pouchetia maxima sp. nov. 

 Plate 6, figure 61 ; text figure 00. 2 



DiAGXosis. — Large species, ellipsoidal, its length 1.1 transdiameters ; girdle 

 forms a descending left spiral of 1.5 turns, displacement 0.72 total length : tor- 

 sion 0.75 turn, ocellus concentrated, median, horizontal; lens hemispherical, 

 melanosome with reddisli brown central core ; plasma pale lavender. Length, 

 145/*. Pacific off La Jolla, California, July. 



Descriptiox. — The body is subellipsoidal with the dorsal side more convex, and the ventral 

 flattened. Its length is l.-i transdiameters at the widest part of the body which is equatorial. 

 The epicone is shorter than the hypocone by 0.12 the length of the former, is a.symmetrically 

 hemispherical at the apex, being tilted to the left and ventrally, and has a length above the 

 anterior pore of 0.06 and at its distal termination of 0.80 of the total length of the body. The 

 hypocone has a length at the proximal and distal ends of the girdle of 0.94 and 0.20 respectively 

 of the total length of the body. It is somewhat wider and more voluminous than the epicone. 

 The antapex is broadly rounded and slightly asymmetrical, the sulcus terminating in a trough 

 on the side of the body opposite to that of the anterior pore but without a terminal sulcal notch. 



The broad girdle joins the sulcus anteriorly at a point 0.06 of the total length of the body 

 from the apex. It immediately curves posteriorly at about 40° from the horizontal for 0.5 turn 

 before crossing the dorsal side almost horizontally, then again turns posteriorly at about 45^ 

 for 0.5 turn, slackening in the distal 0.25 turn almost to the horizontal again, making in all 1.5 

 turns before joining the sulcus distally, at a point 0.2 of the total length of the body from the 

 antapex. Its total displacement is thus about 0.75 length of the body. The anterior flagellar 

 pore lies at the anterior junction of the girdle and sulcus, the posterior one posterior to the 

 distal junction. The furrow has a width of 0.09 transdiameter and is not deeply impressed. 

 The transverse flagellum traverses the girdle for about 0.25 of its length. The pores open on 

 opposite faces of the body. 



