184 NEW UNIONID^, MELANID^, ETC., 



longitudinally and finely striate, minutely perforate ; whorls five ; aperture lunate, 

 three-toothed ; lip thickened and reflected. 

 Proc. Acad. Nat. Soi., 1857, p. 102. 



Eab. — Tamaulipas, Mexico, Dr. Berlandier. 



My cabinet and cabinet of the Smithsonian Institution. 

 Diam. "35, Length '17 inch. 



Remarks. — This is another of the new shells brought by Lieut. N. D. Couch, U.S.A., 

 from Tamaulipas, and presented to the Smithsonian Institution, being of Dr. Berlan- 

 dier's original collection. It is near to Troostiana and Couchiana, but still nearer if 

 it be not a variety of Texasiana, Moricand. It has one whorl less, and the 

 umbilicus is smaller. The form of the aperture and the teeth seem to be almost 

 exactly the same. 



Paludina Milesii. pi. 24, fig. 114. 



Testa Isevi, subpyramidata, subcrassa, imperforata ; spira exserta ; suturis valde impressis ; anfractibus 

 senis, subinflatis ; apertura parvinscula, subovata ; labro acuto, parum sinuoso ; columella superne et 

 inferne parum incrassata. 



Shell smooth, subpyramidal, rather thick, imperforate ; spire drawn out ; sutures 

 very much impressed ; whorls six, somewhat inflated ; aperture rather small, sub- 

 ovate; outer lip acute, slightly sinuous; columella slightly thickened above and 



below. 



Proc. Acad. Nat. Sci. 1863, p. 156. 



jffab. — Branch Lake, Antrim County, Michigan, M. Miles. „ 



'" My cabinet and cabinet of Mr. Miles. 

 Diam. -57, Length 1-03 inch. 



Remarks. — Three specimens were sent by Mr. Miles. This species is more elongate 

 than Integra, Say, being less inflated in the body whorl, and need not be confounded 

 with subpurimrea, Say, on one side, nor coarctata, (nobis,) on the other. It seems to 

 be more regularly pyramidal than any other species, if we can judge from three rather 

 imperfect specimens. It is to be regretted that perfect specimens could not be pro- 

 cured, but Mr. Miles informs me that he has not been able to find more than 

 those sent for my inspection. They are all without the epidermis and without the 

 opercula. The aperture is about six-sixteenths the length of the shell. The color of 

 the epidermis therefore remains to be ascertained. I have pleasure in naming this 

 after Mr. Miles, who is the discoverer of the species. 



Paludina Elliottii. pi. 24, fig. 115. 



Testa subcarinata, pyramidata, subcrassa, viridi-oliva, arctissime umbilicata, ls9vi ; spira elevata, subacuta, 

 ad apicem cornea ; suturis excavatis ; anfractibus septenis, rotundatis, superne obtuse carinatis, ultimo 

 parviusculo ; apertura subrotundata, parva, intus albida. 



