. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 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
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. 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. 44B. 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; Please note that these images are extracted from scanned page images that may
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