VoL. 2] Ritter —The Pelagic Tunicata. 61 
ti 
Fig. 11.—Hypophysis of C. affinis. 
nearly coincidently with the endostyle. Intestine nearly straight 
and of uniform character, though turned a little dorsad 
and to the left at anal end; the anus somewhat trumpet shaped. 
Stomach in the sharp curve of the tract, flattened; a large cecum 
extending backward appearing as a direct posterior prolongation 
of the intestine. Entire intestine uniform orange, generally, but 
occasionally devoid of color. Pericardium-heart large, situated 
ventrad of the posterior end of the endostyle. Salpa chain reach- 
ing forward in mid-ventral line under the endostyle and emerg- 
ing to the outside far forward, between the ventral ends of the 
first body muscle band. 
Fig. 10.—C. affinis, aggregate generation. 
(b) Aggregate (sexual) generation.—Fig. 10. Agegregations 
containing from nine to twenty zooids, united radially about a 
common centre, by the large ventral peduncle, remaining intact 
until zooids are fully grown; in nature, six or eight or more of 
