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1877.| ANTHOBRANCHIATE NUDIBRANCHIATE MOLLUSCA. 233 
Gen. Hictrus, Lovén, 1846. 
Aigires, Lovén, 1844. 
Body convex, covered with large tubercles. Mantle indistinct, 
represented by a supracapital veil, and by a tubercular ridge along 
each side. Rhinophores linear, smooth or hispid. Branchiz non- 
retractile. Odontophore with simple, curved lateral spines; no 
central spine. An upper corneous jaw. 
1. AX. PUNCTILUCENS, Lovén. 
Polycera punctilucens, D’Orbigny, Mag. de Zool. vii. p. 7, pl. 
106. f. 1-3 (1837). 
Doris maura, Forbes; Algires punctilucens, Lovén. 
Hab. North European coasts. 
2. A. peucKartTi, Verany, Journ. de Conch. iv. p. 388 (1853). 
Hab. Mediterranean (Nice). 
3. AX. HISPIDUS, Hesse, Journ. de Conch. xx. p- 346 (1872), 
and figured xxi. pl. 12. f. 3-7. 
Hab. Coast of France (Brittany). 
Gen. Norovoris, Bergh, 1875. 
Body limaciform (the back not distinct from the sides). Rhino- 
phores smooth, retractile in cavities protected by valves. No buccal 
armature. Lingual teeth, none median, the lateral ones erect and 
-hook-shaped. ( Bergh.) 
N. cirrina, Bergh, J. c. Heft viii. p. 64, T. 9. f. 32-45, & T. 10. 
f. 1-8 (1875). 
Hab. Rarotonga. 
Gen. Ceratosoma, Adams & Reeve, 1848. 
Body elongate, prismatic, smooth, ending in a bluntly pointed tail ; 
the dorsal surface passes into a postbranchial fleshy protuberance. 
Mantie obsolete. Rhinophores laminated. Branchie with the roots 
more or less coherent, placed in front of, and partially around, the 
tubular anus, with which they are retractile into a common, smoothly 
margined cavity. Odontophore with numerous rows of simple spines, 
none of which are central. A spinous buccal collar. 
1. C. cornniceruM, Adams & Reeve, Zool. of Voy. of Samarang, 
“Moll. &c.” p. 68, pl. 19. f. 5 (1848). 
Doris trifida, Gray; C. trilobata, id. 
Hab. Sooloo and Philippine seas. 
2. C. TRILOBATUM, Adams. 
D. trilobata, Gray, M. E. Gray’s Fig. Moll. An. iv. p. 13, t. 67. 
f. 14 (1850). 
C. trilobata, id. 
