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Show 1877.] A N T H O B R A N C H I A T E N U D I B R A N C H I A T E M O L L U S C A . 223 branchiae generally small, numerous, ramose, non-retractile, arranged in 6 to 8 tufts, which are set in an open circle at some distance around the anal opening ; oral tentacles large, fleshy, flat, ovoid or leaf-shaped, with crenulate edge. Odontophore broad, with numerous lateral simple spines in each transverse row : none median in position. The species fall under two well marked divisions:- a. Those with the body depressed; the mantle non-pustulose, widely expanded, and attenuate at the border; and the mouth with two lateral more or less horny plates, forming a land of prehensile collar. 1. HEXABRANCHUS PR.ETEXTUS, Ehr. Symb. Phys. "An. Ev. excl. insect." (1831). Hab. Red Sea. 2. H. SANGUINEUS, Gray. D. sanguinea, Riipp. & Leuck. Atlas &c, Neu. Wirb. Th. des R. Meers, p. 28, t. 8. f. 1 (1828). Hab. Red Sea. 3. H. SUEZENSIS, Abraham, Ann. & Mag. Nat. Hist. 4th ser. vol. xviii. p. 137, pl. 6. figs. 3, 3 a (1876). Hab. Red Sea. 4. H. SUPERBUS. Doris superba, Gould, U.S. Expl. Exp., Mollusca, p. 301, pl. 23. fig. 396 (1852). Actinodoris superba, H. & A. Adams. Hab. Samoa Islands. 5. H. CARDINALIS, H. & A. Adams. D. cardinalis, Gould, I. c. p. 302, pl. 25. fig. 397. Hab. Sandwich Islands. 6. H. SUMPTUOSUS, H. & A. Adams. D. sumptuosa, Gould, I. c. p. 303, pl. 24. fig. 398. Hab. Tonga Islands. 7. H. SANDWICHENSIS, Gray. D. sandwichensis, Souleyet, Voy. de la Corv. 'la Bonite,' Zool. ii. p. 451, pl. 25. f. 1-4(1852). Hab. Sandwich Islands. 8. H. MARGINATUS. D marginata, Quoy & Gaim. Voy. de l'Astrol. Zool. ii. p. 255, pl. 17-f- 1-5(1832). D. marginalis, Gray; D. gloriosa, Kelaart. Hab. Amboina; Ceylon. |