94 ANNUAL REPORT OF 



DOUBTFUL SPECIES. 



A number of small forms, some of them no doubt representing 

 the young of different species, have been described from the Con- 

 necticut Valley and from New Jersey, but owing to one cause or 

 another, such as faulty preservation, inadequate description, or 

 subsequent injury to or loss of the type-specimens, the names 

 which have been proposed for them cannot be said to rest 

 upon a secure foundation. In this category may be placed 

 the so-called "Ischypterus parvus" founded upon a figure pub- 

 lished in Hitchcock's Geology of Massachusetts in 1835 > "Ischyp- 

 terus minutus" Newberry, from Durham, Connecticut; "Ischyp- 

 terus newberryi" Loper, also' from Durham ; and "Ischypterus 

 beardmorei" Smith, from Boonton. The last name was pro- 

 posed without definition for a specimen figured in the Metro- 

 politan Magazine for October, 1900 (p. 502). Except for its 

 small size, the original (which belongs to Mr. G. C. Berrien, of 

 Upper Montclair) is suggestive of Semionotus ovatus. Mr. 

 Loper' s species is considered by Dr. Eaton to be identical with 

 S. micro pterus. 



Genus Acentrophus Traquair. 



Trunk fusiform ; teeth slender. Fins small, with very large 

 fulcra; dorsal fin short, opposed to the space between the anal 

 and the pelvic pair; caudal fin symmetrical, slightly forked. 

 Scales rhombic, smooth or feebly ornamented ; no enlarged dorsal 

 ridge-scales ; the scales of the flank not much deeper than broad, 

 and those of the ventral aspect nearly equilateral. 



It will be noticed that the only trenchant distinction between 

 this genus and Semionotus consists in the absence of enlarged 

 ridge-scales. 



Acentrophorus chicopensis Newberry. 



1888. Acentrophorus chicopensis, J. S. Newberry, Monogr. U. S. Geol. Surv., 

 vol. xiv., p. 69, pi. xix., Figs. 3, 4. 



Under this name are described certain fishes of moderate size 

 ("six inches long by one and one-half inches wide," according 



