326 PROCEEDINGS OF THE ACADEMY OF [1899. 



One hundred and two species, belonging to forty-two families, 

 arc here recognized as valid. Of these, fifty ai'C confined to the 

 Peruvian region, twenty-seven are common to both Peru and Chile, 

 and thirteen are recorded north of the equator. 



The following are here described as new : 



Basilichthys odavius. 



Basilichthys regillus. 



Basilichthys jordani. 



Pi-sdregia heardsleei, new gen. and sp. 



Sciaena gilberti. 



The writer wishes to express his indebtedness to Admiral 

 Beardslee, through whose efforts the Callao collection was made, and 

 the present paper made possible. He is also indebted to Mr. 

 James Douglas Ogilby, of Sydney, N. S. W., who has contributed 

 important information and .suggestions, as well as to Dr. G. A. 

 Boulenger, of the British Museum, who has very kindly exam- 

 ined types and in other ways rendered valuable assistance. Espe- 

 cially must he express his obligations to Dr. Charles H. Gilbert, 

 of Leland Stanford, Jr. University, in Avhose laboratory the work 

 was carried on, and to President David Starr Jordan, Avho has 

 taken a personal interest in the work and who personally super- 

 vised it. 



BR ANO HIOSTOMID^. 



1. Branchiostoma elongatum Sundevall. 



B. elonr/at/rm. Sundevall, (Efvers. Vet. Akatl. Forhandl., 1852, 147 ; 

 Steindachner, Fauna Chilensis, 334, 189S. 



Steindachner records this species from Cavancha bay, Iquique. 



GALEID^. 



2. Galeus mento (Cope). 



Mastelus mento Cope, Proc. Amer. Phil. Soc, May 4, 1877, 31 



[Pecasmayu Bay, Peru]. 

 Mustelus edulis Perez Canto, Estudias sobre algunos Escualos de 



Chile, 4, 1886 ; E. A. Philippi, Ann. del Universidad de Chile, 



Ixxi, 1887, 15. 



Local name, Tollo. 



This species, which is not represented in the present collection, is 

 very close to G. dorsalis, from which it differs especially in the 

 more anterior position of the first dorsal, the distance between the 

 origin of that fin and the tip of the snout being about six and 



