4 ART. 5. — ï. AIDA. 



Thus, in the genus Kowalevskia, two species are known : one 

 described by Fol from Messina and found also in our coast, 

 and another described by Lohmann from the Atlantic Ocean and 

 characterized by the possession of three glandular cells.^^ 



Genus Fritillaria. 



This genus is poorly represented on the Japanese coast. I 

 have obtained only three species — haplostoma, ^je^/iici<i(ï and sar- 

 (jassi. All these species are always found in the swarm of 

 Nodiluca together with Koiualevshia. Their occurrence, according 

 to my experience, always alternates with that of the genus Oiho- 

 pleura : when Fritillaria appears, Oikopleura diminishes in 

 number, and in the great crowd of the latter, the former is not 

 found at all. 



1. Fritillaria tiaplostonia Fol (1872). 

 PI. L, figs. 5-8. 



Trunk long, slender; lip well developed in dorsal 

 portion; with a large ciliated fossa (olfactory organ 

 according to Fol) on the right side near otocyst. Sto- 

 mach anterior to, and intestine on the right of, rectum. 

 Intestine with two large, sj^herical, blind sacs on the 

 dorsal and ventral sides. Spiracle and outer opening 

 of atrial canal large, lenticular. Ovary spherical; 



1) Whether or not the view of Garstang ('92) that the Appendicularia described by 

 Moss ('68) is a Kowalevskia and a species distinct from A', tcnuia, may be left out of tlie 

 present consideration. 



