AND OTHER FAMILIES. 227 



Remarks. — This is perhaps the most attenuated Lymnaea yet ob- 

 served in this country. It approaches most to the rejlexiis (Say), but 

 is more elongate than that species. The most remarkable character of 

 the exilis is, perhaps, the reflection of its labium, which is not laid on 

 the body of the whorl. Where it joins above with the labrum, the 

 angle is quite acute, and is separated from the body whorl. The spe- 

 cimen figured was not taken alive, and the epidermis being destroyed, 

 the description and representation are partially defective. The aper- 

 ture is about two-fifths the length of the shell. 



Physa elliptica. Plate XIX. fig. 83 



3' 



l^estd sinistrosd, ellipticd, tenuissimd, pellucidd, castaned, nitidd; spird brevius- 

 culd; anfractihus quaternis ; labro marginato ; aperturd angustatd. 



Shell sinister, elliptical, very thin, pellucid, chesnut coloured, shining; spire rather 

 short ; whorls four ; outer lip margined ; aperture narrow. 



Hab T. G. Lea. 



My Cabinet. 

 Diam. -2, Length -5 of an inch 



Remarks. — This species is less inflated and more of a chestnut colour 

 than any I am acquainted with. Its colour is almost reddish, and the 

 light coloured margin of the outer lip is remarkable. The aperture 

 is rather contracted, and the whole shell somewhat elongate. 



Ampullaria Hopetonensis. Plate XIX. fig. 84. 



Testa subventricosd, Isevi, superne suhplanulatd, perforata, luteo-fuscescente, 

 fasciata ; suturis impressis ; anfractibus quinis ; aperturd subovuta, albd. 



Shell subventricose, smooth, flattened above, umbilicate, yellowish-brown, banded ; 

 sutures impressed ; whorls five; aperture subovate, white. 



