8 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. [1885. 



cles scaly. Head, 3^ in length; depth, 5^. D. XI-12 ; A. II, 9. Scales, 

 9-65 to G7-11. 



The scales are a little smaller than in Indiana specimens (lat. 1. 63), 

 bat probably no permanent distinction exists. 



28. Hadropterus phoxocephalus, Nelson. 



Not abundant in the river channel. D. XII-13. Lat. 1. 70. 



29. Boleosoma olmstedi maculatum, Agassiz. 

 Common in Village Creek. 



30. Ammocrypta clara, sp. nov. 



Allied to Ammocrypta pellucida, but with the squamation much less 

 perfect. 



Head, 4^ ; depth, 8. D. XI-10 ; A. 1, 8. Lat. 1. 69. Length, 2^ inches. 

 Body elongate, hyaline, subcylindrical, formed as in A. pellucida. Head 

 formed as in A. pellucida, the snout a little more acute. Mouth sub- 

 terminal, the upper jaw protractile, the maxillary extending nearly to 

 front of eye, its length 4| in head. Teeth rudimentary, excessively 

 minute, appreciable along the edge of the jaws only with the lens, none 

 evident on vomer. Eye moderate, 4^ in head, nearly as long as snout 

 and more than double the width of the narrow, grooved, iuterorbital 

 space. Cheeks and opercles with rather few thin scales imbedded in 

 the skin. Opercular spine well developed. Gill membranes very little 

 connected. 



Bodj' naked, except for a strip of scales along the lateral line, con- 

 sisting of 5 or 6 series of small, imbedded, wide-set, ctenoid scales. 

 Uu the caudal peduncle this band widens out, covering the whole depth 

 of the tail. 



Fins of moderate height, developed about as in A. pellucida. Yen- 

 trals slightly shorter than pectorals, which are a little shorter than 

 head. 



Color in life, translucent, yellowish on top of head. Some dark points 

 on snout, middle of back, and tail; a few along lateral line. Traces of 

 faint orange spots along sides, connected by a lateral streak. Two dark 

 spots, one before the other at base of caudal. Fins all pale. 



A few 8i)ecimens taken in a sandy part of the river opposite Ottumwa. 



Specimens were also obtained in Eed River at Fulton, Arkansas, and 

 in the Sabine River at Longview, Texas. 



B. — Chariton River. 



The Chariton River at Chariton, Iowa, is a narrow, sluggish stream, 

 with a muddy or sandy bottom, in summer reduced to a succession of 

 greenish pools of dirty water. 



1. Noturus gyrinus, Rafinesqae. 



Young specimens. 



