O. 510NACANTUVS. 251 



11. Anal Jin with 40 (39) or more rays. Ventral spine none : Aluteies. 

 A. Dorsal spine above the orbit. 

 1. Dorsal spine ivith distinct barbs. 



34. Monacanthus heudelotii. 



Aluterus heudelotii, IloUard, Ann. Sc. Nat. 1855, iv. p. IS. 

 D. 37. A. 41. 



iSkin finely velvety. Body oblong, its depth being one-third of 

 the total length, without caudal fin, vrhich is elongate, and one- 

 fourth of tlio total. Snout with the upper profile straight. Dorsal 

 spine large, armed with barbs in front and behind, situated above 

 the orbit. Ventral spine none. Uniform brown. {IloUard.) 



Senegal. 



a. One and a half inch long. Congo ex])edition. 



2. Dorsal spine feeble, ruwjh, but without barbs. 



35. Monacanthus monoceros. 



Acara muca, Willuffhbi/, tab. E. 2. fig. 2. 



Vaknt. fig. 310 ; lienard, i. pi. 4. fig. 24, ii. pi. 4. fig. 10. 



IJalistes, sp., Gronov. Zoophyl. no. 193. 



Balistes monoceros, Osbeck, It. p. 110; L. Syst. Nat. i. p. 404 ; Bl. 



tab. 147 ; Bl. Schn. p. 402. 

 Capriscus, sp., Klein, Fisc. Miss. iii. p. 25. no. 8, tab. 3. fig. 11. 

 Lija bai'buda, Parra, p. 48, lam. 22. fig. 2. 

 Balistes kleinii, Gm. L. p. 1472. 



monoceros, var. unicolor, Bl. Schn. p. 463. 



seiTaticornis, Freminv. Nuuv. Bull. Sc. Soc. Philoin. no. 07, 



p. 249, tab. 4. fig. 1. 

 Aleuteres berardi, Less. Voy. Coq. Zool. p. 107, pi. 7 ; Richards. Voy. 



Sulph. Ickth. p. 132, pi. 01. fig. 1. 

 Alutera cinerea, Schley. Faun. Japan. Poiss. p. 292, pi. 131. fig. 1. 

 ? Balistes unicornu, Basilewsky, Nouv. Mem. Soc. Nat. Mosc. x. 1855, 



p. 203. 

 Alutari'js macracanthus, Bleek. Verh. Bat. Gen. xxiv. Balist. p. 22, 



pi. 3. fig. 0. 



amphacauthoides, Bleek. I. c. p. 23, pi. 2. fig. 5. 



obliteratus, Catd. Mai. Fish. p. 353. 



Balistes linguatula, Gronov. Syst. ed. Gray, p. 35. 

 Aluterus angiuosus, Ilolhtrd, Ann. Sc. Nat. 1855, iv. p. 11. 

 Alutera gimthoriana. 2Wy, Proc. Ac. Nat. Sc. Philad. 1803, p. 184. 

 Aleuteres monoceros, Bleek. Ned. Tyds. Dierk. iii. 1805, p. 28 ; Atl. 



Ichth. V. p. 140, pi. 226. fig. 2. 



I). 4.S. A. 50. Vert. 7/13. 

 Skin finely velvety. IJody oblong, its depth being two-fifths or 

 less than two-fifths of the cotal length (without caudal). Snout 

 produced, with the upper profile convex. Dorsal spine feeble, above 

 the middle of the orbit. Tart of the gill-opening in advance of, 

 [)octoral fin below, the orbit. Caudal fin subtruncate, much shorter 

 than the head ; dorsal and anal fins low. Ventral spine none, 

 riiiform brownisli. 



