Sl'AliOID FISHES OF AMERICA AND EUKOI'E. 501 



84. ORTHOPRISTIS INORNATUS. 



Microlei)idotun inontatus Gill, Proc. Ac. Xat. Sci. I'bilii. ^HC,2, 25G (Capo S.ui Lucas). 

 (h-tliitpiisdn inoniatas, p:vormanii & Jenkins, Proc. H. S. N. M. 1891, UiS ((iiiajMiias). 



Habitat: Gulf of California. 



Etymology: IiwrnatuH, not adorned, 



Thi.s interestinj^: species is known only from the Gulf of California. 

 The specinien.s examined by ns are from (Jape San Lucas and Gnayinas. 

 The subgenu.s Microlepidotus, whicli it represents, is a well -marked 

 group, perhaps worthy of recognition as a distinct genus. 



XVII. ISACIA. 



Isacia .Jordan & Fesler, fjcn. nov. {concc'^jtioniii). 



Type: rrlstipomd conceptione Cuv. & Val. 



Etymology: From Imhl, a Japanese name of Parapristipoma trilin- 

 eaium {=PrisHp()majaponiciini Cuv. &> Val.). 



We separate from the genus rdraprisfipoma an .American species 

 {concept tone), which differs from the type of Pristipomn nuich as Ortho- 

 prltit'iH does fi-om Pomadasis. The anal fm is very long in this species, 

 and it lacks the peculiar sheatli of scales fimnd in Ptirapristipojna. 

 The gill-rakers are well developed in both groups, but tlie outline of 

 the dorsal is in Tfiftcia more as in Pomadafii.s. Although this species 

 has been referred to Pri.stiporna, it lacks the symphyseal groove. 



ANALYSIS OF SPKCIES OF ISACIA. 



a. Dorsal fin deeply notched; an;il fin long; candal fin forked. 



h. Dorsal spines l.'J or 11, the soft dorsal about half as long as spinous portion; 

 lower Jaw projecting. Body oblong-elliptical, moderately compressed; an- 

 terior profile nearly straight, a little depre.sscd above eye; snout short and 

 .sharp; mouth small, oblifjue; teeth small, arranged in bands, the outer above 

 a little enlarged ; x)reoibital narrow ; preopercle finely serrate ; gill-rakers long 

 and slender, x-4-22 ; scales above the lateral line arranged in very oblique series ; 

 those below horizontal ; soft fins, naked ; dorsal spines slender and rather high ; 

 soft dorsal rather low; anal spines small, graduated, second spino about half 

 aa long as first ray; pectoral about as long as head; caudal moderately forked. 

 C<d(U- bluish-silvery below, a dark streak along each row of scales below the 

 lateral line, these being horizontal and parallel ; some scales above lateral line 

 having jjale centers, these making scattered paler spots; axil dusky. Head, 

 3i; depth, 2J; D. xiii-xiv, 12 to 14 ; A. iii, 13; scales, 10-G.5-1G ; eye, 1$; snout, 

 li; nuixillary, 3^; pectoral, 1,V, ; third dorsal spine, 2; second anal spine, G; 

 soft dorsal, IJ in spinous Coxckitioms, 85. 



85. ISACIA CONCEPTIONIS 



PriHiijyoma eonceptione Cuv. &, Val., v, 2G8, 1830 (Chile). 



Habitat : Coast of Chile and Peru. 



Etymology: From Concepcion in Chile. 



This species is an ally of Ortlwpristis hreripinnis. As, however, it 

 lacks the central groove at the symphysis, it can not be referred to the 

 same genus. The sj)ecimens seen by us are from Mexillones in Peru 

 and from Caldcra and Paraca in Chile. One specimen has 11 dorsal 

 spines, the others 13. 



