176 



{Body without opercular papilla and papillary ridges on the sides.) 



Pyloric appendages two on each side. Stomach rounded and turned 

 slightly on the side. 



Ovary situated principally behind the stomach. 



Fins. Ventrals absent. Dorsal, 8 or 9. Anal, 8 or 9. Pectoral, 12. 

 Caudal, 28. 



This genus principally differs from Amblyopsis and Typhlichthys by 

 the presence of eyes, the absence of papillary ridges on the head and 

 body, by having two pyloric appendages on each side instead of 

 one, and by the posterior position of the ovary. It agrees with Typh- 

 lichthys in the absence of the ventrals, and the young further agree 

 by the presence of palatine teeth. 



Chologaster corrmtus Agassiz. 



AGASSIZ, Amrr. Jour. Sri., xvi. p. 135, [853. GlRARD, Procd. Acad. Nat. Sci. 

 Philad., p. 63, 1859. SilNTHER, Cat. Fish. Brit. Museum, vii, p. ■_'. 1808. Putnam, 

 Amer. Nat., vi. p. i\ et seq., with figs. Jan., 1872. 



Plate 2 (Amer. Nat., Vol. vi, Jan., 1872). Fig. 2. Natural size. 2a, stomach 

 and pyloric append iges, twice nat. size. 2i>. scale magnified (nat. size represented 

 by small outline over the left of the fig). 2c, abdominal ca\it> showing stomach 



and single ovary behind the stomach, twice nat. size. 



Head more thru half as wide as it is long. Length of head, from 

 tip Of under jaw to end of operculum contained twice in length of 

 body from operculum, to caudal fin. Width between the eyes equal to 

 distance from eye to tip of under jaw. 



Eyes of moderate size, situated just hack and over the end of the 

 maxillaries. 



Dorsal and anal .fins of nearly equal size, slightly rounded. Anal 

 with slightly longer rays and commences under fourth ray of dorsal. 



Pectoral fins pointed, reaching to line of commencement: of dorsal. 



Caudalfin pointed, aboul equal in length to the head. Membrane 

 above and below extending but slightly on the tail. 



Scales very small and deeply imbedded in the skin. Circular with 

 small smooth space forward of the centre. From 15 to 20 con- 

 centric rings, cut by a few short radiating furrows on anterior, and 

 longer and more numerous ones on posterior margin. 



Intestine is a little longer than in an Amblyopsis of the same size. 



common fresh water trout (Salmo) and marine Conner or sea perch (Ctenolabras) 

 but there have never been recorded allied genera with these characters, while 

 the malformed specimens are hardly numerous enough to give support to the the- 

 ory that such malformations are hereditary, and it is probable that each ease was 

 caused by the non-development of the parts from special cause during embryonic 

 life, or by accident to the individual. 



