738 PROCEEDINGS OF THE ACADEMY OF [Nov., 



pointed, and a small patch present on vomer. Tongue small, and not 

 free from floor of mouth. Nostrils well separated. Gill-opening 

 extending forward nearly opposite front rim of orbit. Rakers slender, 

 rather numerous, and shorter than filaments. Isthmus trenchant, 

 narrow. Middle of base of pectoral about opposite lower rim of orbit. 

 Anal beginning a little in front of second dorsal. Anus close in front 

 of anal. Peritoneum l)lackish. 



Length 5^ inches. 



Type of Protistius scmotUus Cope, No. 14,404, A. N. S. P. Peruvian 

 Andes, from an elevation of twelve thousand feet. 



GASTEROPTEEUS Cope. 



Proc. Amer. Philos. Soc, XVII, 1S7S, p. 700 (archceus). 



Pisciregia J. F. Abbott, Proc. Acad. Nat. Sci. Phila., 1899, p. 342 (beardsleei) . 



Differs from Protistius chiefly in the presence of more than one dorsal 

 spine. 



Originally confounded with the Mugilidce by Prof. Cope, this genus 

 has recently been redescribed by Mr. J. F. Abbott under the name of 

 Pisciregia. 

 Gasteropterus archaeus Cope. Plate XLIII (upper figure). 



L.c. At Arequipa, on the Pacific slope, at an elevation of 7,500 feet. 

 [Peru.] (CoU. Prof. James Orton.) 



Head 4; depth about 6; D. IV-I, 11; A. I, 15; P. i,I, 16; V. I, 5; 

 scales about 86 in lateral series to base of caudal; width of head 2 

 in its length; snout Si; eye about 5; maxillary about 2|; interorbital 

 space 2|; pectoral 1^; ventral a little over 2; least depth of caudal 

 peduncle 2f. Snout protruding a little beyond mandible. Tongue 

 small, rather narrow, and a little free in front. Nostrils well separated . 

 Gill-opening extending forward nearly opposite front rim of pupil. 

 Rakers shorter than filaments, slender, and rather numerous. Pseudo- 

 branchiffi rather small. Isthmus narrow and compressed. Several 

 irregular lateral series of porous or tubular scales, and though lower is 

 broken in places it is more complete than others. Pectoral extends 

 a little more than f of distance to base of ventral. Anus about mid- 

 way between tip of ventral and origin of anal . Peritoneum deep brown . 



Length 6^ inches. 



Type of Gasteropterus arclucus Cope, No. 22,002, A. N. S. P. Are- 

 quipa on the Pacific slope at an elevation of 7,500 feet. Peru. Prof. 

 James Orton, collection of 1874. Prof. E. D. Cope. Alsoa co-type 

 with same data. 



Pisciregia beardsleei J. F. Abbott is closely related, if distinct, and 

 while included in Mr. Abbott's paper on "The Marine Fishes of Peru " 



