98 CALIFORNIA ACADEMY OF SCIENCES 



been recorded; but tbere are no distinct blue sjwts on the dorsal, in our material, 

 and in general the coloration seems to have been less variegated than in D. radiale. 



176. Diplectrum euryplectrum Jordan <l- Bollman. 



Known only from moderate depths in Panama Bay, where it was dredged by 

 the "Albatross" in 1888, in 33 to 51| fathoms. 



It is a deeper species than radiale, with much wider preopercular lobe, 8 

 series of scales on the cheeks, and constantly 8 anal rays. There is no trace of blue 

 spots on the soft dorsal, which is marked by a very characteristic narrow black bar 

 along the base. The coloration in the fresh state has not been reported. Judging 

 from alcoholic specimens, it is probable that the species differs widely from radiale 

 in that respect. It was not taken in the Gulf of California with its companion species, 

 D. macropoma. 



177. Prionodes fasciatus Jenyns. 



This species is abundant among the Galapagos Islands, and on the coast of 

 Mexico, but has been recorded but once from Panama Bay (Pearl Islands and 

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



178. Paranthias furcifer {Cuvier d- Valenciennes). 



Not seen by us; recorded from Panama by Steindachner (1876, 6, p. 6; as Serranus 

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



Rhegma Gilbert. 

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



Allied to Rypticus, Grammistes and Gramma, having the large ctenoid scales and interrupted 

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

 ture of the Rypticinic. 



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. Branchios- 

 tegals 7. Pseudobranchiae well developed; a wide 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 Rypticina. 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 without spines or ridges. 



