[)g I'ALIFOUNIA ACADKMV OF SCIENCES 



been reconlocl; but tliorc are no distinct blue spots on tbc dorsal, in diir iniitcrial, 

 and in j;enonil the coloration seems to Imvc been less variegated tliiiii in />. nnJiale. 



176. Diplectrum euryplectrum Jordan 1- Bollman. 



Known only from moderate deptlis in Panama Bay, wliere it was dredged by 

 tbe " Albatross" in 1888, in 33 to 51i fatboms. 



It is a deeper species tban radinle, witb niiicb wider preopercular lobe, 8 

 series of scales on tbe cbeeks, and constantly 8 anal rays. Tliere is no trace of blue 

 spots on tbe soft dorsal, wbicb is marked by a very cbaracteristic narrow black bar 

 along tbe base. Tbe coloration in tbc fresb state bas not been reported. Judging 

 from alcobolic specimens, it is probal)lc tbat tbe species diflers widely from radiale 

 in tbat respect. Tt was not taken in tbe Gulf of California willi its companion species, 

 I), inncrojwma. 



177. Prionodes fasciatus Jenyns. 



Tbis species is abundant among tbe CJalapagos Islands, and on tbe coast of 

 Mexico, but lias been recorded but once from I'anama Bay (Pearl Islands and 

 Panama, Jordan & Gilbert, 1882, n, p. 625). It was not seen by us. 



178. Paranthias furcifer {Cuvier & Valenciennes). 



Not seen by us; recorded from Panama by Steindachner (1870, /^ p. 6; as Sermnui^ 

 creolus), and by Gilbert (see Jordan, 1885, p. 377). 



Rhegma Gilbert. 



Rhegma Gilbert (Jordan & Evermann, 1898, p. 3169). 



Allied to Rypliais, Grammistcs and Gramma, having; the large ctenoid scales and interni|)ted 

 lateral line of Gramma, and the peculiar physiognomy, attachment of gill-membranes, and fin struc- 

 ture of the RypticintB. 



Scales of moderate size, thin, not embedded, minutely ciliated; lateral lines 2, the upper near 

 base of dorsal, ceasing under origin of posterior fifth of soft dorsal, the lower line beginning slightly in 

 front of the end of the upper line, running along middle of caudal peduncle; the tubes very short, 

 borne on much smaller intercalated scales, and not forming a continuous line. Head largely scaled, 

 the snout and jaws naked. 



Gill-membranes united anteriorly, forming a narrow free fold across the isthmus. Hranchios- 

 tegals 7. Pseudobranchise well developed; a w^ide slit behind last gill-arch; gill-rakers short, broadly 

 triangular, strongly toothed. Upper margin of opercle, above its angle, wholly attached by mem- 

 brane to the shoulder girdle, as in the RypticincE. Mouth large, protractile, the lower jaw protruding, 

 the maxillary broadly exposed, with a narrow supplemental bone along its upper edge. Teeth all 

 villiform, in broad bands on jaws, vomer and palatines, the inner teeth on jaws slightly longer than 

 the others and depressible. Tongue smooth. Large mucous pores on under side of mandible, and 

 slit-like pores present on edge of preorbital and around front of eye. Anterior nostril near edge of 

 preorbital, provided with a short tube; posterior nostril without tube or raised rim, immediately in 

 front of eye. A short free triangular flap on upper edge of each orbit. Upper portion of preopercle 

 with a single strong plectroid spine, directed backward and downward; bones of the head otherwise 

 unarmed, the preorbital and preopercle with entire edges, the opercle w'ithout spines or ridges. 



