90 ACANTHOPTERTGII. 



1. Dentex rivulatus. 



Eiipp. N. W. Msclie, p. 116, t. 29, fig. 2 ; Giintlier, Catal. i, p. 372. 

 Qymnocra/fdus rmulaius, EHunz. Verh.. z.' b. Ges. Wien, 1870, p. 765. 



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



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

 the length of head. If diameters from the end of snout, and If apart. The depth of the preorbital rather exceeds 

 the length of the diameter of the orbit. The masilla reaches to below ]bhe 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 spiae equals the length of the third and is slightly longer than the 

 ninth : second anal spine two-thirds as long as the third which 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 — greenish, glossed with golden on the sides : wavey blue lines 

 along the snout and over the preorbital. 



Habitat. — Red Sea and Ceylon. 



Genus, 23 — Stnageis (Elei/)i) Oilnfher. , 



Dentex, pt. Cuv. and Val : Nendpterus, Swains. : Spondyliosoma, sp. Cantor : Heterognathon, pt. Steind. : 

 Dentex (C. V.) Bleeker.* 



BromcMostegals five or , six : pseudoira/ncMcB. Body oblong, rather elongate and a little elevated. Eyes of 

 medium or rather la/rge size. Mouth moderately protractile, its 'cleft more or less horizontal : jaws of about equal 

 length. Preopercle entire or feebly serrated .- opercle without any or with a not very prominent spine : the distance 

 between the eye and the angle of the mouth considerable.f Moderately sized cwned ecmines in tfie upper and generally 

 feeble ones in the front of the lower jaw : an innenr villiform band in either jaw and usually an outer conical row .- 

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

 having three spines and seven rays : all the spines weajc : caudal forJced. Scales cterioid, of moderate size, three rows 

 on the preopercle 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. striaius = Synagris 

 Giinther, and consequently might perhaps (to prevent further confusion) be employed instead of Synagris. 



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

 beyond. 



SYNOPSIS OP SPECIES. 



1. Synagris striatus, D. V", -A-. f, L. 1. 48. Preopercle serrated : only 2 rows of teeth in the lower jaw, 

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

 of India to Surinam. 



2. Synagris tolu, D. V", -A- f, L- 1- 48. Preopercle entire. Lateral conical teeth in either jaw. Dorsal 

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

 of India to the Malay Archipelago. 



3. Synagris Bleelceri, D. V, A. f, L. 1. 48. Preopercle entire. No outer conical row in the upper jaw, 

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

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



4. Synagris filamentosus, D. V", A. |, L. 1. 48. Preopercle serrated. A lateral outer row of small conical 

 teeth m 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. y, A. f, L. 1. 47, Preopercle entire. An outer row of small conical teeth in 

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

 elongated spines or rays ; interspinous membrane slightly notched. A brilliant spot on the .first 5 scales below 

 the lateral-line. Andamans. 



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

 ? Ooryphoena striata, Bl. Mss. 

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

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



* Genus Syia^ris (Klein) Bleeker = Venter (C. V.) Gunther in part, and is not similar to Synagris, Giinther. 

 t The preorbital in the following spec.es of thisg'enus is high and consists of two pieces, the posterior of which ends in a 

 point at Its posterior-superior angle, but this point which is of rarying extent, does not form a spine as in the genus ScoJo/^ The 



L^el^er^o^surfl of ^h^te. ^ '' ' " ''"'' '"'"""^ " ""' ^^^'"^ ^''"''^^ °'' '° *« •=^*«'^^' ^"^ »^«i"l first retS on t^ 

 % Marked Synagris luteus on the plate. 



