FAMILY, XL— GLYPHIDODONTID^. 381 



SYNOPSIS OF SPECIES. 



1. Tetradrachmm. ma/rgmatvm, D. yJ.^g-, A. ^!^, L. 1. 26-26, L. tr. 3/12. Blmsh, with a dark zone 

 from the front dorsalspmes to the ventral fin : scales on head and body with a blue spot. Eed Sea, East coast 

 of Africa, seas of India to the Malay Archipelago and beyond. 



2. Tetrad/raehmum a/rucmum, D. if, A. -fy, L. 1. 25-27, L. tr. 3/11. White, with three vertical black 

 bands. Red Sea, East coast of Africa, seas of India to Polynesia. 



1. Tetradrachmum marginatum, Plate LXXIX, fig. 7. 



Pomaoenhus ma/rgmatus, Riipp. Atl. Eische, p. 38, t. viii, f. 2. 



Bascylhis ma/rgmatus, Cuv. and Val. v, p. 439, pi. 133, f. 2 ; Lefebvre, Voy. Abyss, vi, p. 231 ; Guer. 

 M6nev. Iconog. iii, pi. xis, f. 6 ; Steind. Verb, zool-bot, Ges. Wien, 1861, p. 77 ; Giiather, Catal. iv, p. 14 ; 

 Klunz. Eische Roth. Meer. Verb. z. b. Ges. Wien, 1871, p. 520. 



Dascyllus xanthozona, Bleeker, Banda, i, p. 247 ; Giinther, Catal. iv, p. 14. 



Pomacentre gros yeux, Lienard, Dix. Rapp. Soc. Hist. Nat. Maur. p. 34. 



Tebrad/raohimmi xcmtJwzona, Bleeker, Eish. Madagascar, p. 85. 



B. V, D. yJ.a^, P. 17, V. 1/5, A. ^?i7, C. 17, L. 1. 25-26, L. tr. 3/12. 



Length of head 3i to 4, of caudal 3f to 4, height of body If ia the total length. Eyes— dLiametej! 

 2^ in length of head, 1/2 to 3/4 of a diameter from end of snout, and 1 apart. Body strongly compressed : the 

 profile, omitting the caudal, is nearly orbicular. Preorbital narrow, the suborbital ring and hind edge 

 of preopercle serrated. Fms — dorsal spines from the second to the last of about equal length : caudal slightly 

 emarginate. Oolowrs — Bluish. A dark band passes from in front of and below the first two dorsal spiaes, 

 through the base of the pectoral to the ventral. Snout dark. Every scale on the head with bright blue spot 

 edged with black, also those on the chest and lower two-thirds of the body : a few on the upper third of 

 the body Hkewise similarly spotted. Soft dorsal and caudal yellow : spinous dorsal, ventral, and anal black. 



A small specimen of this species was dredged off the Andamans by Mr. Wood- Mason. The one figured 

 was given me for that purpose by Dr. Bleeker. 



Sabitat.—rSiedi Sea, east coast of Africa, Andamans, to the Malay Archipelago, China, and beyond. 



2. Tetradrachmum aruanum, Plate LXXX, fig. 6. 



Ghododon a/rcualms, Linn. Mus. Ad. Fried, t. xxxiii, fig. 8, and Syst. Nat. p. 1243 ; Shaw, Zool. iv, 

 pp. 341 and 348. 



Ghododon mrucmus, Bloch. iii, p. 62, t. cxcviii, f. 2 ; Bl. Schn. p. 220 ; Shaw, Zool. iv, p. 348. 



Ghcetodon abu dafw, Forsk. p. 16. 



LutjcMvus wruwrms, Lacep. iv, p. 720. 



Pomacentrus a/ruomus, Rupp. Atl. Eische, p. 39. 



Ghododon a/rcmeus, Bennett, Eish. Ceylon, p. 17, pi. xvii. 



Basoyllms ariiamos, Cuv. and Val. v, p. 434 ; Bennett, Life of Raffles, p. 688 ; Rupp. N. W. Eische, 

 p. 129; Bleeker, Banda, i, p. 246, iii, p. 108; Giinther, Catal. iv, p. 12; Kjier, Novara Eische, p. 241 : Klunz. 

 Eische Roth. Meer. Verb. z. b. Ges. Wien, 1871, p. 519. 



Tdrcbd/rachnuum arawatitm, Cantor, Catal. p. 241 ; Bleeker, Bintang. 1868, p. 4. 



B. V, D. \i-.\i, P. 17, Y. 1-/5, A. yT?T¥> C. 15, L. 1. 25-27, L. tr. 3/10-11, Csec. pyl. 3, Vert. 12/14. 



Length of head 4, of pectoral 4, of caudal 4^ to 5, height of body 2i in the total length. Eyes— 

 diameter '2/5 of length of head, 1/2 a diameter from end of snout, and 1 apart. The maxOla reaches 

 to below the anterior fourth of the orbit. Preorbital, pre-, and sub- opercles serrated. Shoulder-bone also 

 serrated. Fms — third dorsal spine the longest, as is also the second of the anal. Colowrs — ^pearl-white, with 

 three vertical black bands, the anterior "descending from the three first dorsal spines through the eye over the 

 snout to the under surface of the lower jaw: the second from the sixth to the ninth dorsal spines to 

 the ventral fins, which are black : the third from the base of the soft dorsal to the anal : caudal dark, light 

 posteriorly. 



HaSitoi.— Eastern coast of Africa through the seas of India to Polynesia, &c. : it is numerous at the 

 Andamans, Nicobars and Burmah, but much rarer in Western than in Eastern India. 



Genus, 4 — Pomacenteus, (Laeep.) Cm. 



Pristotis, Riipp. : Lepidoeygws, Giinther. 



BrcmoMostegals four or five : psewdolroMcMcB. Preopercle^ cmd usually infraorbital ring serrated. Tedh 

 small, compressed : the crowns smooth or ema/rginated. Dorsal with 12 or 13, anal with 2 spines. Scales rather 

 lao'ge. Lateral-line ceases below the sofi dorsal fin. Ai/r-vessel present. Pyloric appendages few. 



Geegraphical distribution. — Tropical seas of both hemispheres. 



