90 ACANTHOPTERYGII. 



1. Dentex rivulatus. 



Riipp. N. W. Fischc, p. IIG, t. 29, fig. 2; Giiuthcr, Catal. i, p. 372. 



Gijmnocranius rivulatus, Klunz. Verb. z. b. Ges. Wien, 1870, p. 7G5. 



D. \%, P. 15, V. 1/5, A. tV, C. 17, L. 1. 48, L. tr. 7/20. 



Length of head 4/17, of caudal 2/11, height of body 3/10 of the total length. %es— diameter 3/11 of 

 the leno-th of head, If diameters from the end of snout, and ly apart. The depth of the preorbital rather exceeds 

 the leno-th of tlie diameter of the orbit. The maxilla reaches to below the front nostril. Hind limb of preopercle 

 almost vertical and entire, a few serrations exist along its rounded angle. Teeth — an outer row of strong canines 

 in the upper jaw, and a strong lateral row of conical ones : lower jaw with six canines in front and a lateral 

 conical row which posteriorly become rather obtuse. Fins — dorsal spines rather strong, increasing in length 

 to the fourth from whence they decrease to the last, the height of the fourth equals the distance from the eye to 

 the end of the preorbital bone, the last dorsal spine equals the length of the third and is slightly longer than the 

 ninth : second anal spine two-thirds as long as the third wliich equals the length of the post-orbital portion of 

 the head : caudal deeply forked. Scales — five rows on the cheeks : superiorly they do not extend so far as to 

 opposite the posterior edge of the orbit. Colours — gi-eenish, glossed with golden on the sides : wavey blue lines 

 along the snout and over the preorbital. 



Habitat. — Red Sea and Ceylon. 



Genus, 23 — Synagkis (Klein) Giinther. 



Dentex, pt. Cuv. and Val : Nemipterus, Swains. : Sponchjliosoma, sp. Cantor : Heterognathon, pt. Steind. : 

 Dentex (C. V.) Bleeker.* 



DrancMostegals five or six : j^seiidolrancJuce. Body oUong, rather elongate and a little elevated. Eyes of 

 medium or rather large size. Mouth moderately lyrotractile, its cleft more or less horizontal : jaws of about ^ equal 

 length. Preopercle entire or feelly serrated : opercle without any or %mth a not very prom-inejit spine: the distance 

 between the eye and the angle of the mouth C07isideralle.f Moderately sized curved canines in the upper and generally 

 feeble ones in the front of he lower jaw: an inner vilhform band in either jaw and usually an outer conical rmv : 

 -vomer, palate, and tongue edentulous. One scaleless dorsal fin having ten spines and nine rays : anal also scaleless 

 having three spines and seven rays: all the spines weak: caudal forked. Scales ctenoid, of moderate size, three roivs 

 on the pireopercle none along its outer border, on the snout, preorbital, or jaws. Air-vessel not constricted but notched 

 posteriorly. Pyloric appendages few. 



Swainson's genus Nemipterus is founded on Dentex filamentosus, C. and V. = D. strhtus = Syyiagris, 

 GiJnther, and consequently might perhaps (to prevent foi-ther confusion) be employed instead of Synagris. 



Geographical distribution.— Red Sea, East coast of Africa, seas of India to the Malay Archipelago and 

 beyond. 



SYNOPSIS OF SPECIES. 



1. Synagris striafus, D. V". ^- f' ^- 1- ^8. Preopercle serrated : only 2 rows of teeth in the Tower Jaw, 

 no conical ones. Two first dorsal rays and upper lobe of caudal prolonged. Silvery, with purplish bands. Seas 

 of India to Sm-inam. , . , „ 



2. Synagris ti>lu, D. V". ^- f' L. 1. 48. Preopercle entire. Lateral conical teeth m either .law. Dorsal 

 spines elongated and interspinous membrane deeply notched. Roseate, with yellow longitudinal bands. Seas 

 of India to the Malay Archipelago. 



3. Synagris Bleekeri, D. V". ^- h L. 1. 48. Preopercle entire. No outer conical row m the upper jaw, 

 a single, conical lateral row in the mandible. No elongated spines or rays : interspinous membrane slightly 

 notched. A spot on the opercle. Seas of India. 



4. Synagris filamentosus, D. \'', A. f, L. 1. 48. Preopercle serrated. A lateral outer row of small conical 

 teeth in the upper jaw only. Upper caudal lobe prolonged : interspinous membrane slightly notched. Yellowish- 

 red, with roseate longitudinal bands. Seas of India. 



5. Synagris notatus, D. V*! ^- f> L. 1. 47. Preopercle entire. An outer row of small conical teeth in 

 the upper jaw, also a similar row in the mandible, but becoming very small in the last fourth of the jaw. No 

 elongated spines or rays; interspinous membrane slightly notched. A brilliant spot on the first 'j scales below 

 the lateral-line. Andamans. 



1. Synagris striatus, Plate VIII, fig. 5. J 



? Coryidicma striata, PL Mss. 



? GoryphoMa lutea, Bl. Schn. p. 297, t. Iviii. 



Dentex striatus, (? Cuv. and Val. vi, p. 252) ; Jerdon, M. J. L. and Sc. 1851, p. 134. 



* Genus Synagris (Klein) Bleeker = Dentex (C. V.) Giiuther in part, and is not similar to Synagris. Giinther. 



t The preorbital in the following species of tliis genus is high and consists of two pieces, the jiosterior of which ends in u 

 point at its posterior-superior angle, but tliis point, which is of varying extent, does not form a spine as in the genus Scolopsis. The 

 posterior border of this preorbital plate is free, the skin covering it not passing directly on to the cheeks, but being first reflected on to 

 the posterior snrfacc of the plate. 



% JIarked Synat/ris luteu! on the plate. 



