iQIl] ASCIDIANS FROM THE CoASTS OF CANADA. l2^ 



C. COO peri sp. n. 



Nearly spherical or flattened against the object of attachment. 

 Apertures with small pointed lobes. Siphons very short. Surface, in- 

 cluding that of siphons, entirely covered with closely placed sand grains, 

 which adhere to the usual filaments. Up to 15 mm. in length. In ad- 

 dition to the usual siphonal musculature, there is an almost uniform 

 layer, continuous with the circular fibres of the siphons. It is thin over 

 the intestine, gonads, &c. 



About 75 (?) tentacles. Aperture of dorsal tubercle crescent-shaped, 

 turned toward the left. Dorsal lamina narrow, its margin smooth; it 

 does not extend beyond oesophageal aperture. Six folds on each side, 

 their posterior ends fringed. Up to 14 bars on a fold, occurring on both 

 sides of each fold. Stigmata forming the usual infundibula, with 10 

 or more turns in each spiral. Each stigma represents ^ of a circle, so 

 that more or less regular transverse rows are formed, such as are character- 

 istic of the genus Ctenicella as defined by Hartmeyer. 



Intestinal loop narrow, bent into a semicircle. Margin of anus 

 smooth. Gonads much elongated. The left is in the concavity of the 

 intestinal loop and anteriorly bent over the tip of the loop. It is thus 

 closely applied to the intestine for a considerable distance. The right 

 gonad is much longer than the renal organ, to which it is closely applied. 

 The latter is of the usual shape. Each gonad consists of an axial ovary, 

 with the testicular lobes scattered along its upper and lower margins. 

 The vas deferens runs along the inner side of the ovary and projects up- 

 ward with the oviduct from the posterior end of the gonad. 



Several specimens were obtained in 5 to 15 fathoms, sand and gravel, 

 in Departure Bay. 



This species is doubtfully distinct from C. regularis (Ritter) from 

 California. From the data available at present, there are the following 

 differences, — a smaller number of tentacles (10), the absence of siphons 

 (?), the aperture of dorsal tubercle a longitudinal slit, which is not curved, 

 and the larger diameter of the stomach in C. regularis. 



Rhizomolgula globularis (Pallas). 



Syn. Ascidia globularis Pallas, Nov. Act. Ac. Petr., vol. 2, p. 241. 

 ? Rhizomolgula gigantea Redikorzew, Mem. Ac. St. Peters., ser. 8, 

 vol. 18, no. II. 



Laterally compressed, somewhat elongated parallel to a line joining 

 apertures. Largest specimen is 19 mm. long, 17 mm. deep, and 12 mm. 

 thick. Apertures about 7 mm. apart, not on distinct siphons. Surface 

 sparsely covered with sand grains. On the side of the body opposite 

 the apertures there are usually 2 short ' roots, ' each with numerous long 

 branches. The usual siphonal musculature; on each side near the 



