100 Evermann and Kendall — Fish from Central Ecuador. 



ventral and upper and lower caudal rays slightly produced ; ventral some- 

 what rounded ; first or outer rays of all fins spinuliferous ; longest ray of 

 pectoral just reaching base of outer ray of ventral ; insertion of ventral 

 about under middle of dorsal ; ventral reaching slightly beyond vent but 

 not to anal ; head ratlier broad and depressed ; gill-openings reaching 

 below base of pectoral, membranes broadly attached to isthmus; gills 4, 

 no slit or pore behind the last; cheeks tumid; eyes minute, vertical, 

 covered by the common outer skin and situated about midway between 

 nostrils and upper angle of opercle; interorbital space about equaling 

 distance from posterior edge of nostril to eye ; barbel reaching somewhat 

 l)eyond cheek ; nasal openings sejjarated by an irregular triangular flap; 

 mouth opening inferior ; upper lij) thick, plicate and papulose; lower lip 

 expanded, papulose, with median suture connected by the skin, posterior 

 margin rounded, slightly notched ; teeth in several rows in each jaw ; 

 upper teeth sim{)le, somewhat curved, conical, some of them somewhat 

 expanded at end, teeth of inner rows all bifid; lower jaw bones separate, 

 connected only by the membrane; teeth all l>ifid, situated only at the 

 expanded inner ends of the bones. 



Color, olive-gray, thickly clouded with darker; fins all barred witli dark 

 gray. 



/7y2a 



Figs. 2 and 2a. — Cyclopium cyclopum, male. 



M'lte.— Head 4 28 in length to base of caudal; D. 7 ; A. 6; P. 10 ; V. 5 

 C. lo. Body rather slender, diff'ering remarkably in appearance from the 

 female; more depressed anteriorly and more compressed posteriorly; 

 posterior dorsal fold not so noticeable, barely evident; spine hardly dis- 

 tinguishable through the skin ; pores on anterior part of body coarser than 

 in the female ; outer ventral and lower caudal ray, somewhat more 

 produced; the first rays of all fins spinuliferous; pectoral reaching beyond 

 base of ventral ; ventral inserted under or slightly in advance of front of 

 dorsal, not reaching vent; head much flatter and somewhat broader than 

 in female. Color, similar to female but much darker. Sexes otherwise 

 readily distinguishable by the long papilla just posterior to the vent in the 

 male, probably serving as an intromittent organ ; this organ somewhat 



