PEELTMINAIIY DESCRIPTIONS OF A NEW GENUS AND 

 THREE NEW SPECIES OF CRUSTACEANS FROM AN 

 ARTESIAN WELL AT SAN MARCOS, TEXAS. 



By James E. Benedict, 



Aiisistaiit Curator, Department of Marine Inrrrtehratci 



On January IS, 1890, the United States Fisli Commissiou com- 

 pleted an artesian well at San Marcos, Texas. The depth of the well is 

 188 feet. The flow of water obtained amounts to more than 1,00(> 

 gallons per minute. The water is i)ure and of excellent quality, and 

 has a temperature of 7.3° Fahrenheit.' 



Since the completion of the well, tliere have been taken from the 

 Avater several specimens of a tailed batrachian, numerous shrimps of 

 the genus Falcvmonetes, a lesser number of Isopods of a new genus, and 

 a very few Amphipods. All are blind. 



PALi^MONETES ANTRORUM, new species. 



xVs might be expected, the eye-stalks of the specimens are without 

 pigment spots of any kind, nor does clearing the stalk in glycerine 

 show lens structures. The rostrum is short and deep, with from ten 

 to twelve sharp teeth on the ui)per margin and none on the lower. 

 The point of the rostrum is sharp and very short. The antennal scale 

 extends beyond the rostrum one-half of its length. The flagella of 

 the antennic are 30 mm. in length, in s[)ecimens 18 and 20 mm. long-. 

 The flagella of the antennnla? are elongated, the longer ones equaling- 

 the length of the bodj". The feet are all very long and slender, reaching 

 far l)eyond the antennal scale. 



Type.—^o. 19326, U.S.N.M. 



CIROLANIDES, new genus. 



Eyes ncme. Peduncle of antennuhe with three segments and an elon- 

 gated flagellum. Peduncle of antenna' with live segments. Peduncle 

 of uropods not produced at the inner posterior angle. Lacinia of the 



' From ii iioto by Prof. B. W. Evermann accompanying the specinien-s 



iTocei-dinss of tlic riiitfil Statos National Miisemn, Vol. X\'III — Xo. 1087. 



[AdvaiK'c .slitcts of this iiapcr were i)iil)lialie(l April 14, 1H96.] 



615 



