KOPOID AND SWEZY: UNAKMORED DINOFLAGELLATA 215 



Description. — The body is siibovoidal to fusiforin ellipsoidal iu shape, circular in cross- 

 section, its length 2.1 trausdianieters at the widest part at the girdle. The hypocone exceeds 

 the epieone in length by about 0.25 of its own length. The epicone is dome-shaped or subconical 

 (50°-55°), flaring slightly at the base and broadly ronnded at the apex. It has a length on the 

 left and right sides of 0.37 and 0.44 respectively of the total length of the body. The hypocone 

 is subcylindrieal, flaring slightly at the girdle, and broadly rounded at the antapex, which is 

 sometimes notched by the distal end of the sulcus. In lateral view the hypocone has an almost 

 straight outline on the ventral side and convex on the dorsal. 



The girdle is premedian, its proximal end meeting the sulcus at a distance from the apex of 

 0.37 and its distal end 0.44 of the total length of the body. It occupies a narrow, deep trough 

 with smooth overhanging borders. Its distal end is displaced posteriorly about twice its own 

 width. The sulcus begins near the apex or somewhat below it and extends posteriorly in an 

 almost straight line to the antapex. It lies in a trough which is narrow anteriorly and widens 

 posteriorly, forming a broad channel along the ventral face of the hypocone, the furrow itself 

 remaining nearly the same width throughout. The anterior flagellar pore opens at the proximal 

 junction of the girdle and sulcus and the posterior pore midway between the distal junction 

 and the antapex. 



The nucleus is an ellipsoidal body found in the posterior half of the hypocone. Fine, monili- 

 form chromatin strands follow its longitudinal axis. Its major and minor axes are 0.54 and 

 0.46 transdiameters respectively in length. 



Small saeklike pusules are usually present, opening into one or lioth pores. In one individual 

 tlie pusule was large, subspherical and located near the cent(n- of the body. Prom it a long 

 narrow canal passed to the anterior pore. The cytoplasm is finely granular and generally has 

 many cell inclusions. In the apical region of one individual were a group of vacuoles filled with 

 the pink fluid associated with the pusules. Just above the large pusule which occupied the 

 center of the body was a group of dark, refractive granules from which extend radial, greenish 

 rodlets of two sizes, long slender ones and short, thicker, more nmnerous ones. A small orange- 

 colored body, presumably a food body, was found near the girdle. The ectoplasm shows the 

 same differentiation into a thin layer surmountd by an alveolar layer as has been described for 

 G. dogieli and G. amphora. 



The color of the protoplasm is a pale, yellowish grey, but the color may vary considerably 

 with diiferent individuals. In some specimens observed the color was a yellowi.sh brown with 

 a large, orange red food mass in the epicone. In figure 19, plate 2, the color varies from bluish 

 green in the apical region to yellow-green in the antapical region. 



Dii^rENSiONS. — Length, 105-130/^; transdiameter, 50-61/^; axis of nucleus, 

 25-30M. 



Occurrence. — The first specinieus were taken July 16, 1907, in a surface 

 haul 1 mile off La Jolla, California. On July 23 of the same season it was 

 taken 0.75 of a mile off La Jolln in a sitrface haul It was taken again on June 

 29, 1917, with a No. 12 silk net in a haul 1 mile off La Jolla, from 40 meters to 

 the surface and in a surface temperature of 21-1 C. This species occurred 

 abundantly throughout the summer in the surface hauls from the end of the 

 pier and in the deeper hauls offshore. The munlK'r of individuals noted in a 

 short examination of each haul would vary from 1 to 8 or more. The other 

 and earlier records for this species are as follows: By Bci-gh (1881?.)), who 

 fii'st described it from the Baltic >Sea; by Paulsen (1907), from the Cattegat 

 off Denmark; by Wright (1907), from the Atlantic off Nova Scotia in July; 

 by Ostenfeld (1913) from the Cattegat off the coast of Denmark. 



