1892.] Zoology. '_>">! 



The Worm Gymnorhynchus Reptans.— M. Moniez ha: 

 recently found a perfect specimen of Oymnorhynehw reptnm ii 



(h-i/rhiiKi i/Iaiira. This genus h distinguished from other sj*ecies o 

 Tetrarhynchides, kpown in the larval state, by a curious app. ti.la-- a 

 the end of the sac into which the animal can retract the anterior par 

 of its body as in a ey-t. This appendage, about one meter in length 



Van Beneden, the sac into which the anterior part of the larva' ii 



this very long animal there remains only the neck and that small por- 

 tion of the tissues attached to which the name "zone generatriee " ha: 



rings which complete the animal. 

 M. Moniez consider^ igi eomparabU with tha 



found in several Cestodes of the tvpe of Tcenia serraUi. (Revue 1 >i<-l 

 Jan. 1892). 



New Fishes from Chihuahua, Mexico.— During the month: 

 of July and August, 1891, some collections of fishes were made by tin 

 author at several points in Mexico, from Orizaba to Chihuahua ; man} 

 interesting specimens were taken, several of which are believed to b* 

 new to science. The specimens here described were taken from tht 

 Rio de las Conchos at Chihuahua. The river bed here is half a mih 

 wide in places, with numerous sand bars and depressions. It is little 

 more than a river bed however, owing to the almost total lack of rain 

 fall throughout the entire year. The water in this large river bed is 

 reduced to a very diminutive stream that is brought from the moun 

 tains ten miles away by an aqueduct to supply the city with water. 



A mile below the city the stream is dammed, in order to use th< 

 water for irrigating purposes. Here on one side the bank is high and 

 rocky and the water is entirely too deep to be seined. The other bank 

 is composed of sand, sloping gradually to the deeper water, and ii 

 easily accessible. The bottom is covered with several inches of mud 

 and in many places the shallow parts are thickly grown with vanom 



These quiet waters swarm with fish, for the most part of the minnow 



At the upper end of the pond the water was shallow, dear, and n 

 places swift enough to form ripples, here a number of Cyprindontida 



