192 MARIE V. LEBOUR. 
This is perhaps the commonest gymnodinian and occurs close to 
the shore as well as beyond the Breakwater. Length of body 
0-040 mm. to 0-050 mm 
Fic. 7.—Gymnodinium triangularis n. sp. 466, 
a ventral view showing contained Pheocystis, b side view. F=food. 
(45) Gymnodinium triangularis n. sp. (Fig. 7). Closely related to G. 
rhomboides, but triangular in outline (the base of the triangle 
posterior) and without longitudinal striz on the body. Rare in 
water samples in May. This species had also been feeding on 
Pheeocystis pouchetii, remains of which were recognisable inside 
it. Length 0.045 mm. 
Fie. 8.—Gym .odinium minor n. sp. < 466. 
a dorsal view. 6 ventral view. N—=nucleus. 
(46) Gymnodinium minor un. sp. (Fig. 8). This little species is 
transparent and destitute of any sculpture. It is nearly spherical 
but with the posterior end slightly narrower than the anterior. 
Transverse groove left-handed and only slightly displaced, longi- 
tudinal groove reaching to the posterior end. Nucleus nearly 
