93. EMBIOTOCID.E — AMPIIISTICHUS. 591 



not very high, the spines slender. Scales small, 00-75 in the course of 

 the lateral line. Si)ecies ."), diliering considerably in form and appearance, 

 but agreeing in essential characters. («/j'.v''j, double; <y-^x"'-> series.) 



* Lower lip without freuum; gill-rakers numerous, long. 



a. Profile depressed or concave over the eyes; mouth very oblique, the lower 

 jaw projecting; ej'e very large. 

 1). Anal fin short, its.raj'S about III, 23. {Hi/pocriUchihys* Gill.) 



939. A. aiialss (A. Agassiz,) Jor. & Gilb. 



Silvery ; an inky blotch on the middle of the anal tin and a fainter 

 blotch on the spinous dorsal ; front of anal yellow ; fins otherwise plain. 

 Axil black. Body comparatively elongate, formed much as in Micro- 

 metrus frenatus ; upper anterior profile nearly straight, depressed above 

 the eyes. Snout sharp. Mouth large, very oblique, the tip of the lower 

 jaw on a line with the uj^per profile of the snout ; maxillary reach- 

 ing front of orbit. Dorsal spines high and slender, longer than the 

 soft rays, the middle longest. Anal spines small. Caudal fin short, 

 not widely forked ; pectorals short and broad,' four fifths the length of 

 head. Eye, five fourths the length of snout. Head 3^ ; depth 2^. D, 

 IX, 22; A. Ill, 23; Lat. 1. 63. L. C inches. San Francisco to Point 

 Concepcion ; rather rare ; locally abundant at Santa Cruz. 



{H;iperpro802)on analis Alex. Agassiz, Proc. Bost. Soc. Nat. Hist. 1861, ISIH: Ri/pocrit- 

 ichthyH anaViH Gill, Proc. Acad. Nat. Sci. Phila. 1862, 276: Ditrema anale Glinther, iv, 250.) 



h. Anal fin long, its rays about III, 33. {Hyperpro8opon\ Gibbons.) 

 c. Ventral fins posteriorly black. 



930. A. nrcuatus (Gibbons) J. & G.— Wall-eyed Perch; White Perch. 



Bluish black above; sides bright silvery, sometimes faintly barred; 

 ventrals with a broad terminal bar of black; caudal and anal edged 

 with blackish. Body ovate, strongly compressed. Interorbital space 

 rather wide, abruptly dei)ressed at the nape, the profile of the snout 

 extending forward at a less angle than that of the back. Snout very 

 short, much shorter than the eye. Maxillary scarcely reaching front 

 of i)upil. Mouth extremely oblique. Eye 2i in head, larger than in 

 any other species. Middle dorsal spines a little higher than the last, 

 or than the soft rays; anal low. Head 3.J; depth 2J. D. IX, 27; A. 



*Gill, Proc. Acad. Nat. Sci. Phila. 1862, 276: type HyperproHopon analia A. Ag. 



{{'TTOKpiTo?, deceiver; lx6va, fish; its appearance (Alicromctrua) belying its affinities 

 {U(>lconolu>i). 



t Gibbons, Daily Placer Times and Transcript, May 18, and in Proc. Acad. Nat. Sci. 

 Phila. 1854, 105: ty\ic Hyperprosopon aryenteus Gibbous. {vTtrjp, above; npodGOTTov, 

 face. ) 



