THE SHORE FISHES OF PERU 401 



nearly straight margin about as long as head without snout; anal 

 beginning somewhat in advance of spinous part of dorsal, its longest 

 rays a little shorter than those of dorsal, its base 2.0 to 2.2 in length; 

 ventral nearly reaching vent, 1.0 to 1.4 in head; pectoral large, reach- 

 ing beyond origin of anal, nearly to beginning of straight part of lateral 

 line, 1.1 to 1.25 in head, 3.75 to 4.0 in length. 



Color brownish, with two light longitudinal bands, one on upper 

 part and another on lower part of side; a series of dark spots on back, 

 another along middle of side, and a third one on lower part of side, 

 the spots irregular in shape, tending to form cross bars posteriorly 

 above lateral line; lower parts of head with dark streaks and dots; 

 fins paler than body, dorsal, caudal, and anal with dark spots, the anal 

 tending to become plain dusky anteriorly; ventral dusky; pectoral 

 with a curved dark streak at base, and with suggestions of dark spots 

 or cross streaks on fin. 



This species is represented bj^ three specimens, 52, 53, and 55 mm. 

 (42, 43, and 45 mm. to base of caudal) long, collected by the Mission 

 at Lobos de Afuera Island. The 53-mni. specimen (U.S.N.M. No. 

 128213) has been chosen as the type. The following proportions and 

 enumerations apply to this specimen: Head 3.5 in length; depth 3.6; 

 pectoral 3.75; base of anal 2.0. Eye 3.1 in head; snout 3.1; interor- 

 bital 11; maxillary 3.0; caudal peduncle 3.1; ventral 1.4 pectoral 1.1. 

 D. XX, 11; A. II, 20; P. 15; scales in lateral Hne (pores) 59, just above 

 lateral line 58, rows between lateral line and sixth dorsal spine 6. 



This species differs from the other local forms in the absence of villi- 

 form teeth in the jaws behind a rather prominent series near the outer 

 rim of the jaws,^^ and in the doubly indented spinous portion of the 

 dorsal. The small number of soft rays in the dorsal fin distinguishes 

 this species from L. xanti and L. philippi, but not from L. microcirrhis. 

 However, its fewer dorsal spines readily differentiate it from that 

 species. It seems to be nearest Lepisoma jenkinsi Heller and Snod- 

 grass from the Galapagos Islands, with which it agrees in the number 

 of scales and fin rays but differs in the absence of bands of villiform 

 teeth in the jaws, in having a smaller mouth (maxillary reaching to 

 or beyond middle of eye in L. jenkinsi), and in the indented spinous 

 part of dorsal. 



Range .—Know n only from Lobos de Afuera Island, Peru. 



LABRISOMUS MICROCIRRHIS (Cuvier and Valenciennes) 



Trambollo 



Clinus microcirrhis Cuviee and Valenciennes, 1836, p. 384, Valparaiso. Chile 

 (original description).— Cope, 1877, p. 26, Callao Bay, Peru (number of 

 fin rays stated). 



Head 3.3 to 3.5; depth 3.8 to 4.2; D. XXIV or XXV, 1 1 ; A. II, 21 to 



2' It was thought that the absence of villiform teeth in the jaws might be due to the smal 1 size (youth) of 

 the specimens. However, upon the examination of examples equally small of L. xanti and of L. philippi it 

 was found that in small specimens of those species such teeth already are definitely developed. It is unlikely 

 therefore, that their absence in the specimens under discussion can be ascribed to youth. 



