364 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



299G. Two small specimeus. 



Compared with the young of Umhrina dorsalls, the young of U. xanti 

 differ iu the following respects: 



The body is more slender and elongate (dei)th 3f ; 3^ in dorsaUs), the 

 head is more elongate, the anterior profile much less blunt and rounded, 

 the eye much smaller (not much longer than snout), the pectoral shorter, 

 (2 in head ; If in dorsaUs), the anal spine shorter. The oblique streaks 

 along the rows of scales are narrower and more sharplj- defined in xanti 

 than in dorsaUs. The number of dorsal rays in dorsaUs is constantly 

 greater. 



Adult examples of the two species obtained by Mr. Gilbert show the 

 following differential characters: 



a. Suout very blunt, not lonsjer than eye, 4 iu head; preopercle with its nicmbraua- 

 ceous edges crenulate ; jjectorals more than two-thirds length of head. D. X-I, 

 30 to 33; A. II, 7. Scales 9-53-12. Dark stripes along rows of scales very faint, 



broader than the pale interspaces. Depth 3 iu length Dorsalis. 



aa. Snout rather acute, longer than eye, 3^ in head ; preopercle with its bony edge 

 serrate; pectorals less than two-thirds length of head. D. X — I, 26; A. IT, 6. 

 Scales 6-48-10. Dark stripes along rows of scales very distinct, narrower than 

 the pale interspaces. Depth 3Jin length Xaxti. 



l!^either species appears to be very common along the coast. 



47. Myriopristis occidentalis Gill. 



{Alijrio2]ris1is occidcnialis Gill, Proc. Ac. Nat. Sci. Phila. 1863, 87: IBhampliohenjx Icu- 

 coptis Gill, Proc. Ac. Nat. Sci. Phila. 1863, 88.) 



C348. (Types oi MyrioprisHs occidentalis.) Veiy many young speci- 

 meus, 2 to 3 inches in length. 



G350. (Types of Myriopristis occidentaUs.) Many young siiecimens. 



0304. (Types oi Bhamphoheryx Jcucopus.) Two specimens, each about 

 2 inches iu length. 



These specimens appear to belong to the same species. In all the 

 specimens called occidentaUs the sides are dull and dusky with dark 

 punctulations. In the types of leucopns the sides have a silvery luster. 

 There is no tangible difference in form, so far as we can judge from 

 these small specimens. 



48. Myriopristis pcscilopus (Gill) J. &, G. 



{UhamphohcriixpcccUopns Gill, Proc. Ac. Nat. Sci. Phila. 1863, 87: Hhamphoherijx Icu- 

 copit.s Gill, Proc. Ac. Nat. Sci. Phila. 1863, 88.) 



G273. {Types of RhampJiobcryx 2)C£cilopus.) Three specimens, each about 

 2 inches in length, in good condition. 



In these specimens the spinous dorsal is all black and the ventrals 

 tipped with black. PcecHopns is probably a species distinct from J/. 

 occidentaUs, although the resemblance is remarkably great, the ditfer- 

 ences, except in color, being scarcely appreciable. 



Compared with occidentaUs of the same size, p(jeciIopus has the lower 

 jaw a tritie shorter and the eye a little larger. In poccilopus the sides 



