. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. Text-fig. 52. Herdmania momus (Savigny) (St. 1686): A, dorsal tubercle; B, anus. Gut. About twenty-four lobes surround the anal opening (Text-fig. 52 B). Remarks. This is a very variable species, but is always readily identified by the spicules in the body wall and branchial sac, and by the large number of branchial folds. Several varieties and forms (see Michaelsen, 1919; Kott, 1952) have been described and for a dis- cussion of these van Name (1945) and Tokioka (1953) should be consulted. Both
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. Text-fig. 52. Herdmania momus (Savigny) (St. 1686): A, dorsal tubercle; B, anus. Gut. About twenty-four lobes surround the anal opening (Text-fig. 52 B). Remarks. This is a very variable species, but is always readily identified by the spicules in the body wall and branchial sac, and by the large number of branchial folds. Several varieties and forms (see Michaelsen, 1919; Kott, 1952) have been described and for a dis- cussion of these van Name (1945) and Tokioka (1953) should be consulted. Both of these latter authors suggest that the subdivisions of the species have little systematic value, but nothing can be added to the argument here on evidence from one specimen. This specimen agrees closely with the description of var. grandis, which is characterized specially by (1) the large size, (2) the large number of branchial folds (ten to thirteen on each side), and (3) the large and complex dorsal tubercle. Distribution. Widely spread in warm waters of the world. Genus Bathypera Michaelsen, 1904 Bathypera splendens Michaelsen (Text-fig. 53) Bathypera splendens Michaelsen, 1904, p. 192, pi. 10, fig. 9; pi. 11, figs. 15-19. Pyura Kouvillia Sluiter, 1912, 543 Occurrence. St. 181: Palmer Archipelago, 160-335 m- External appearance. The body of the single specimen is roughly spherical, approximately 2 cm. in diameter and slightly flattened on the dorsal side, where the siphons make two small, widely separated, conical projections. The general colour is grey, paler on the siphons, and the surface feels rough to the touch owing to the presence of the characteristic test spicules (Text-fig. 53 A) arranged at right angles to the surface. Internal structure. Several detailed descriptions (Michaelsen, 1904; Hartmeyer, 1911; Herdman, 1923; Kott, 1954) leave little to be added. In the 'Discovery' specimen the dorsal tubercle has a complete C-shaped slit (Text-fig. 53 B), not bro
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