n6 



DISCOVERY REPORTS 



of o-6 cm., and the smaller specimen is 0-4 cm. high and 0-5 cm. wide. The surface is smooth, shining 

 and slightly wrinkled. 



Internal structure. This is a well-known species and I shall merely summarize the main characters 

 of the larger of our two specimens. Oral tentacles thirty; atrial tentacles many, short, resembling 

 papillae, and spread over a narrow belt at the base of the atrial siphon. Dorsal tubercle very small with 

 an indistinct opening. Branchial sac — dorsal line 2 (10) 2 (7) 3 (8) 3 (5) 3 endostyle. Stomach with 

 twenty-one folds; anus with six lobes. Gonads two on each side, of the shape shown in Text-fig. 44 B. 



Distribution. Warm waters of Atlantic American coast; English Channel to West Africa; Mediter- 

 ranean; Japan. 



ov 



Text-fig. 44. Styela partita (Stimpson) (St. 2): A, gut; B, left gonad. 



Family PYURIDAE Hartmeyer, 1908 



Genus Pyura Molina, 1782 



Pyura stolonifera (Heller) 



Cynthia stolonifera Heller, 1878, p. 10, pi. 2, fig. 10. 

 For synonymy see Kott, 1952, p. 274. 



Occurrence. St. 90: False Bay, S. Africa, 0-2 m. 



External appearance. The larger of the two specimens is 5-5 cm. high, including a basal extension 

 of test, and 5-0 cm. wide. On the upper side the siphons are close together and prominent. The 

 surface of the body bears some knob-like swellings. 



Internal structure. In one specimen there are eight and in the other about fourteen dorsal 

 languets. The dorsal tubercle has a complex and much convoluted slit which is basically C-shaped 

 with the open interval directed back to the left. The complex dorsal tubercle, and the shortening of 

 the dorsal side of the branchial sac with consequent reduction in the number of dorsal languets are 

 two characteristic features of the species. 



Distribution. South Africa; western, southern and eastern Australia; Tahiti. 



