240 MEMOIRS OF THE UNIVERSITY OF CALIFORNIA 



The girdle is submedian, its proximal end meeting the siilciis at a distance from the apex of 

 0.4 of the total length of the bod}'. It sweeps around tlie body in a descending left spiral 

 direction, displacing the distal end about twice the width of the girdle. The furrow is wide, 

 about 0.05 transdiameter, and is deeply impressed with overhanging shelflike borders, its upper 

 lip cut under and the lower one gradualh' rounded. The sulcus begins midwaj' between the 

 girdle and apex and extends posteriorly to the antapex as a deep trough. In the antapieal 

 region the borders are widely deflected and the trough deepened, forming a deep excavation 

 notching the antapex. The anterior flagellar pore opens at the junction of the proximal end 

 of the girdle and sulcus, the posterior pore a short distance below the distal junction. 



The nucleus is a large spherical body in the central part of the hypocone near the left of the 

 sulcus in ventral view. Its axis is about 0.32 transdiameter. 



No pusules were observed in the individual figured. The cytoplasm is granular and generally 

 contains many cell inclusions. In the epicone was an irregularly shaped food mass, pale lumiere 

 green in color near which was a group of 6 very large spherical bodies of varying shades of 

 cream color and yellowish green. Around these were smaller vacuoles filled with the pink fluid 

 usually present in the pusules, a number of which were also scattered through the hypocone. 

 Behind the distal junction of the girdle and sulcus was a rounded body, dark green in color. 

 Radiating out from this was a group, 10 in number, of long, slender, tapering green rodlets. 

 These varied in length from 22;u to 40u. The difl^erentiated ectoplasm was remarkably clear 

 and striking even under the lowest power of the microscope, where it had the appearance of a 

 wide, clear band surrounding the organism. A closer examination showed it to be composed of 

 two layers, a hyaline double-contoured layer superimposed upon which was a somewhat narrower 

 one of alveoli, the rounded outer surfaces of which gave a ridged, uneven appearance to the 

 outline of the body. The inner layer, like that in G. dogieli, was yellow, the alveolar orange in 

 color on the hypocone shading to lighter tones of the same on the epicone. The whole color effect 

 was rich and striking. 



Dimensions. — Length, 160i^ ; transdiameter, 104^* ; axis of niielens, 34/'-. 



OccuBRENCE. — Tltis was taken June 27, 1917, with a No. 12 silk net, in a 

 haul 6.] miles off La Jolla, California, from 120 meters to the surface and in a 

 surface temperature of 20° C. Another individual was observed on July 11 

 with a No. 25 silk net, in a haul 4 miles off La Jolla. from 80 meters to the stu'faee 

 and in a surface temperature of 20° C. On July 20 a third individual was taken 

 6 miles off La Jolla with the same apparatus and at the same depth, in a surface 

 temperature of 20°5 C. 



Comparisons. — This, with G. dogieli sp. nov., G. amphora sp. nov., and G. 

 al)hreviatiim sp. nov. (figs. AA, 8, 6; fig. Z, 7), foi*m the most striking repre- 

 sentatives of the subgenus PacliydiniHui. They are closely related with the 

 same differentiation of ectoplasm and endoplasm and are remarkably beautifid 

 in coloring, the reproductions of which fail to do them justice. They are the 

 most highly organized of the genus, and form the culmination of a line of 

 development which may be traced from the simpler forms. This species has a 

 posterior sulcal notch not present in the others named, and a greater displace- 

 ment of the girdle. 



