106 
BULLETIN OF THE BUREAU OF FISHERIES 
those now grouped in the genus deviates so notably from the generic type in so many 
characters. 
The Paddvs Creek fish differ from species of the genera Ioa and Ammocrypta 
in that the body is not exceedingly elongate and the premaxillaries are not pro- 
tractile. They differ from Cottogaster (C. shumardi) in the small number of dorsal 
spines, in that the first dorsal is smaller than the second, which is larger than the 
anal; in having dorsals not separated, the opercles and gills naked, the gill mem- 
branes well connected, and the ventral fins close together. They differ from Hadrop- 
terus in that the soft dorsal is larger than the anal, the ventral fins are well separated, 
the gill membranes are broadly connected, and there are hardly half as many dorsal 
spines as in species of Hadropterus. 
The Paddys Creek specimens may be said to show affinities with Pcecilichthys 
iowse, Pcecilichthys ( Catonotus ) Jlabellare, Cottogaster shumardi, and Ioa vigil, but 
not to fall within the presumable limits of variation of any of these species. 
Richiella, nov. gen . 4 
Body not particularly elongate; mouth terminal or slightly inferior; premax- 
illaries not protractile ; skin of premaxillaries connected mesially with forehead by 
narrow frenum; teeth of jaws small; vomerine and palatine teeth present; parietal 
region of skull not strongly convex in cross section; gill membranes broadly united; 
body incompletely scaled, belly partly naked or covered with caduceous plates; 
head and region in front of dorsal naked; lateral line high anteriorly; first dorsal 
low with spines well separated by broad membranes, smaller than second dorsal, 
which is larger than anal; the first and second dorsals contiguous; anal spines 1 
or 2, nearly equal; ventral fins separated by space approximately equal to one-half 
the base of fin. 
Richiella brevispina, n. sp . 6 
D. VI or YII-12; A. I or II— 8 ; P. 12-12 or 12-11; scales 8-48 (49)— 9 ; head 3%; 
depth 5; eye 43^-5. 
Body not particularly elongate, rather compressed, tapering evenly from region 
of first dorsal to base of caudal. Caudle peduncle broad, depth about equaling 
length, or three-fourths of greatest depth of body. Back scarcely arched, dorsal 
profile being nearly straight from nape to caudal, but rising slightly just before 
origin of caudal; ventral profile somewhat round anteriorly. Parietal region of 
skull distinctly depressed. Cranium narrow between the eyes, the interspace less 
than eye. Eye small, its horizontal diameter slightly longer than vertical. 
Mouth rather wide, terminal, moderately oblique, lower jaw barely shorter 
than upper. Maxillary reaching a little past anterior margin of pupil. Lips rather 
heavy, premaxillaries not protractile, skin of premaxillaries connected with fore- 
head by very narrow frenum. Teeth small; vomerine and palatine teeth present. 
Gill membranes broadly united. 
» Type No. 87411, U. S. National Museum; two paratypes, U. S. National Museum, No. 87412. 
s Grateful acknowledgment is duo to Charles M. Breder, jr., for supervision of the drawing reproduced as Figure 1. 
