1877.] ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 223 
branchize 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 kind of pre- 
hensile collar. 
1. HexaBrancuus PR&TEXTUS, Ehr. Symb. Phys. “An. Ey. 
excl. insect.” (1831). 
Hab. Red Sea. 
2. H. sancuinevs, Gray. 
D. sanguinea, Riipp. & Leuck. Atlas &e., Neu. Wirb. Th. des R. 
Meers, p. 28, t. 8. f.. 1 (1828). 
Hab. Red Sea. 
3. H. surzensis, Abraham, Ann. & Mag. Nat. Hist. 4th ser. 
vol. xviii. p. 137, pl. 6. figs. 3, 3a (1876). 
Hab. Red Sea. 
4. H. supersus. 
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. carpinauis, H. & A. Adams. 
D. cardinalis, Gould, 1. c. p. 302, pl. 25. fig. 397. 
Hab. Sandwich Islands. 
6. H. sumprvosus, H. & A. Adams. 
D. sumptuosa, Gould, 7. ec. p- 303, pl. 24. fig. 398. 
Hab. Tonga Islands. 
7. H. sanpwicuensis, Gray. 
D. sandwichensis, Souleyet, Voy. de la Corv. ‘la Bonite,’ Zool. 
p. 451, pl. 25. f. 1-4 (1852). 
fTab. Sandwich Islands. 
ii. 
= 
8. H. MARGrINaTUs. 
D. marginata, Quoy & Gaim. Voy. de l’Astrol. Zool. ii. p. 255, 
LED ead (1832). 
D. marginalis, Gray; D. gloriosa, Kelaart. 
fab. Amboina; Ceylon. 
