336 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



Description. — The body is long, slender fusiform, circular in cross-section, tapering towards 

 both ends, but slightly truncate posteriorly, its length 3.54 transdiameters at the widest part, 

 which is near the middle. The epicone and hypocone are subequal. though the posteriorly 

 extending point on the right ventral side gives to the epicone a slightly greater length. The 

 epicone is convex conical (45°) anteriorly with a pointed apex, but posteriorly its sides are 

 subparallel with only a slight convexity. It has a length on the left and right sides of 0.27 and 

 0.76 respectively of the total length of the body. The hypocone is convex conical with a greater 

 transdiameter posteriorly than the corresponding part of the epicone, with the antapex obliquely 

 truncate on the right side of the suleal notch. Its sides are slightly more convex than those of 

 the epicone. 



The girdle is a steeply descending left spiral, its proximal end joining the sulcus at a distance 

 from the apex of 0.27 and its distal end 0.76 of the total length of the body, giving it a dis- 

 placement of 1.75 transdiameters or about 0.5 of the total length of the body. The furrow has a 

 width of about 0.07 transdiameter and is deeply impressed on its anterior side, where it under- 

 cuts the lip, becoming more shallow towards its posterior border. Both lips are smooth and 

 somewhat protuberant. The sulcus extends from the extreme anterior tip of the body posteriorly 

 in a slightly sinuous line to the antapex. It is narrow anteriorly, widening slightly in the 

 intercingular area and again near the posterior end of the body, where it deeply notches the 

 right side of the antapex. Its greatest width is less than that of the girdle. The anterior 

 flagellar pore opens at the proximal junction of the girdle and sulcus, the posterior pore 

 immediately posterior to the distal junction. 



The nucleus is long ellipsoidal to conform to the shape of the body and is filled with monili- 

 form chromatin strands lying parallel with its long axis. It is located dorsad of the intercingular 

 area, near the center of the body. Its major and minor axes are about 1.36 and 0.33 trans- 

 diameters in length respectively. 



A small, sacklike pusule opens into the anterior flagellar pore. The cytoplasm is finely 

 granular and transparent with numerous .yellowish green spherules and oil droplets scattered 

 through it. A large refractive body of irregular shape, outlined with a dark border, nearly 

 filled the apical region in front of the anterior flagellar pore. The antapical region contained a 

 group of refractive spherules closely massed together and outlined by a dark ring. The color 

 of the body is a pale dull glaucous blue diffused through the cytoplasm. The surface is closely 

 beset with numerous, equidistant, longitudinal, blue-green striae, the number on the hypocone 

 slightly greater than that on the epicone. 25 to 30 across the ventral face. 



Dimensions. — Length, llTf^; transdiameter, 33/^; axes of nucleus, 45/^ and ll/*. 



Occurrence. — Three individuals were taken July 25, 1917, with a Xo. 25 

 silk net, 5 miles off La Jolla, California, in a haul from 80 meters to the surface 

 and in a surface temperature of 20° C. 



Activities. — This is an extremely active form under the microscope, moving 

 in large loose clockwise spirals with a slow rotation on the long axis. The sj^iral 

 is occasionally reversed to the anticlockwise direction. 



Co^tPARisoNS. — In the slender fusiform shape of l)ody this species resemhles 

 G. liritannia sp. nov. (fig. DD, 13) and G. acutuni (Schlitt) (fig. CC, 7), differ- 

 ing from both, however, in the character of its surface markings and in the 

 greater displacement of its girdle, and from the former species also in its lack 

 of iDigmentation. It is the most slender and one of the most active sj^ecies in 

 the genus. 



