342 PROCEEDINGS OF THE ACADEMY OF [1899, 



36. Basilichtliys affinis (Steindachner). 



Chirostoma affine Steindachner, Fauna Chilensis, 313, 1898 [Iquiqne]. 

 This species ajDparently closely resembles the preceding. It 

 appears to differ from B. jovdanl in the absence of vomerine teeth, 

 and from jordani, regillus and octavlus in the much shorter head 

 and in the position of the first dorsal. Steindachner also describes 

 (1. c. 314) a species of the same genus, gracile, from Juan Fernandez 

 which is distinct from those mentioned above, though closely related. 



PISOIREGIA Abbott. New genus. 

 Body and head pike-like. Premaxillary not protractile, its skin 

 continuous with that of the forehead. First dorsal small, with few 

 spines, situated posteriorly. Teeth rather strong, the outer series 

 in each jaw enlarged. Vomer with teeth. Mouth margined 

 entirely by premaxillary, the maxillary lying behind. Caudal 

 peduncle thick. The genus is related to Atherinojjs and Ather- 

 inopsis by the non-protraci ile premaxillary, differing from the 

 former in having simple teeth and from the latter in the presence of 

 vomerine teeth, in the enlargement of the outer series of the max- 

 illary and in the small size of the first dorsal, 



37. Pisoiregia beardsleei Abbott. New species. 



Head 4^, depth 5^, eye Qh in head, 3 in iuterorbital, snout 24, 

 preorbital 1^ in eye. 



D. IV-I, 11 ; A. I, 15. Scales small, 20 series at ventral, 14 

 on tail, 87 in longitudinal series. Head broad, flat, angular, scaled 

 above to posterior no.stril, cheeks, opercles and suborbital scaled. 

 Preorbital, snout and jaws smooth and naked. Chin Avith a series 

 of six pores on each side. Teeth rather large, incurved, in three 

 or four series, the outer enlarged in each jaw. Vomer with half a 

 dozen recurved teeth at apex. Gill rakers 4 + 14, short and 

 stout, 2 in eye. Scales small, entire or sinuate, with radiate strise. 



First dorsal short and low, of 4 weak spines, the height of the 

 longest one-third of base of second dorsal, the fin inserted slightly 

 in front of the vertical from vent. Second dorsal strong, its longest 

 ray about equal to its base, inserted above sixth ray of anal. Anal 

 high, its second ray equal to its base, If in head and equalling the 

 pectoral; ventral 2i in head. Caudal peduncle stout, its depth 2^ 

 in head. Interdorsal space short, 2^ in head. Caudal oblong, 

 forked and but slightly spreading. 



