288 



FISHERY BULLETEN OF THE FISH AND WILDLIFE SERVICE 



dorsal, over anterior margin of pupil or a little 

 more backward in lUppoglossina, over anterior 

 margin of eye or a little more forward in Pseudo- 

 rho/tihurS. The typical subgenus of Hippoglossina 

 diverges in a more pronounced manner from 

 Psei(dorhomhus in tliis respect, but the subgenus 

 Liogloss'ma is rather intermediate. The accessory 

 branch of the lateral line is poorly developed in 

 HippogJossina; it is usually well develo]ied in 

 Pseudorhomhus reaching the dorsal profile in 

 most, but apparently not in all the species. The 

 interorbital is reduced to a mere ridge in Ilip- 

 pogloHHina; in most species of Pse^ulo rhombus^ but 

 apparently not in all, it is wider than a mere 

 ridge. The eye in the typical subgenus of Hip- 

 pogJofisina is markedly large, but in the subgenus 

 Lioglossma it is nearly the same as in some species 

 of Pfieudorho7nhus. In HippogJossina ctenoid 

 scales are present on both sides or absent on both 

 sides; in Pseudorhorribus ctenoid scales are pres- 

 ent on the eyed side and present or absent on the 

 blind side. No other characters than the fore- 

 going are now known by which the two genera 

 may be distinguished. Tliey are hardly adequate 

 as generic characters, and the separation of the 

 two genera is now lai-gely a matter of convenience. 



Subgenus Hippoglossina 



Hippofflossina Steindachner, Sltzb. Akad. Wiss. Wien 74 

 (1): 161 (Ichthy. Beit. 5: 13) 18V6 (genotype Hip- 

 poglossina macrops Steindachner by monotypy). 



A comparative discussion of the differences be- 

 tween this subgenus and Lloglossin-a is given un- 

 der the latter (p. 293). The four known species 

 of this subgenus are confined to the Pacific Coast 

 of North and South America, in rather deep water. 



HIPPOGLOSSINA BOLLMANI 



(PLATE 1) 



Diagnosis. — Scales on eyed side ctenoid on head 

 and body; on blind side cycloid on head, ctenoid 

 on body, the ctenoid scales extending forward to 

 within 3 to 8 rows of gill opening, sometimes to 

 about a vertical through middle of arch in lateral 

 line. Maxillary of eyed aide with 3 to 6 cycloid, 

 more or less embedded scales, usually in one row, 

 sometimes in two irregular rows. Scales 45 to 

 49. No accessory scales. Gill rakers 11 to 13 in 

 total number; 2 or 3 on upper limb; 9 or 10 on 

 lower. Anal rays 46 to 51 ; dorsal rays 60 to 65. 

 Pectoral rays on eyed side usually 11 (in 5), some- 



times 10 (in 1) : on blind side usually 10 (in 5), 

 sometimes 11 (in 1). Origin of dorsal very near- 

 ly over middle of eye (specimens 140 — 167 mm. 

 examined). Teeth nearly eqiuil, the anterior ones 

 slightly enlarged. Maxillary extending to a verti- 

 cal through middle of eye or posterior margin of 

 pupil. Eye conspicuously large; body slender; 

 head and maxillai-y of medium length. Sinistral. 



Color. — Specimens examined faded. Six con- 

 spicuous spots evident, 3 in a longitudital row 

 below dorsal profile and a similar row above ven- 

 tral profile, nearer to profiles than to a median 

 line. Smaller spots evident on caudal peduncle, 

 one each at base of caudal rays, at upper and lower 

 angles, continued on blind side. A row of small 

 white spots close to dorsal profile, and a similar 

 row at ventral profile. Margins of caudal, dorsal 

 and anal on blind side, blackish posteriorly. 



Specimens examined and geographic distrihxi- 

 tion. — Panama Bay; Albatross Station 2805; lat. 

 07°56' N., long. 79°41'30" W.; 51.5 fathoms; 

 March 30. 1S88 (41143, the type; 41147, 41156, 

 41187, 41216, 41250). Number of specimens 

 studied 6, 140 to 167 mm. Jordan and Bollman 

 (1889) state on page 176, "Numerous specimens 

 were dredged at station 2805," and on page 183 

 they record it from station 2804 as well. The lat- 

 ter station is a little north and east of 2805, namely, 

 lat. 08°16'30" N., long. 79''37'45" W., 47 fathoms; 

 but no specimens from that station are now present 

 in the U. S. National Museum. 



Distinctive characters and relationship. — This 

 species difi'ers from stomata chiefly in the smaller 

 number of gill rakers as pointed out under the 

 latter (p. 291), where the other characters distin- 

 guishing the two species are also discussed. Its 

 relationship to mystacimn and to macrops is dis- 

 cussed under the latter two species (pp. 289 and 

 202) . What may prove to be a unique feature of 

 this species is that the number of pectoral rays on 

 the blind side is predominantly one less than on the 

 eyed side. In all species of Paralichthys the num- 

 bers are predominantly the same on both sides, 

 while H. stomata is rather intermediate in that 

 respect. 



Ilippogloxsina macrops JORnAN and Boi.r.NtAN (not 

 Steindaclmer), Proc. U. S. Nat. Mus. 12: 17.",, isst) (Alba- 

 tross Station 2805). — Jokdan and Bollman, ibid., p. 183 

 (recorded from Albatross Stations 2805 and 2804). 



Hippofflossina hollmiDii Gilheht, Proc. U. S. Nat. Mus. 

 13: 123, 1890 (based on .loidan :in<l BnUman's accoiint). — 



