68 EAFINESQTJE'S 



but an ombilio. Many sp. 1. 0. cuprea. Subovat, 4 spires, 

 smooth, brittle, diaphanous coppery, shining^ opening very large. 

 In Kentucky. 



29. TRIODOPSIS, Raf. 1819. Differ Helix, opening with 3 

 teeth. 2 above, 1 below, an ombilic. 1. Tr. lunula. Depressed, 

 mouth narrow With thick lips, pmbilie lunulated. In Kentiicky. 

 Forms S. G. menomphis. 



30. XOLOTREMA, Raf. 1819. Differ from the last by no 

 ombilic, opening linear. 1. X clausa. Subdepressed, 5 spires' a 

 little striated, openipg almost hidden. I have m.any more land and 

 fluviatile univalves, too many to enumerate here ; but I add two 

 beautiful Agatinas from the south. 



31. ■ Agatina Variegaia, Raf. 1820. Six spires, smooth, yellowish, 

 variegated with brown spots near the sutures, first spire with some 

 narrow coloured strias concentric Nearly two inches, from 

 Louisiana. 



32. Agatina Fuscaitt, Raf. 1822. Eight spires, smooth, reddish 

 brown, with broad longitudinal black bands on the spires, of- a lan- 

 ceolate flexuos^ shape. Over two inches, From Texas. Both col- 

 lected by Dr. Strong. 



Vll. FOSSIL BIVALVE SHELLS. 



Z3. MytilusexotiluSi'Ra.f. 1820. Oblong oboval, minutely striated, 

 strias broader below, curved near the sides. Breadth two thirds of 

 length, thickness 4-9. From the lim,estone near Boon creek, Ken- 

 tucky, petrified, over 2 iiQchep. 



84. APLEIIROTIS, Raf. 1819, and tract of October, 1881. K 

 G. very near mytiluSjhut winged and perforated. 1. Apl. pectenoides, 

 Raf. Oboval, iipper valve convex striated, wing well marked, lower 

 valve flat, scarcely striated. Breadth 4-5 of the length, which is 

 oyer 2 inches, 'i. Apl. pusilla, Raf. Oblique oboval, flattened, 

 mi|B,iitely striated, wing small. Breadth | of the length, which is less 

 than one inch. Both from Knobhills of Kentucky. 



36. OXISMA, Raf. 1819. N. G. near Pinna. Base truncate, 

 [4] 

 end gaping, equivalve, hinge lateral plicate on one valve, angular on 

 the other. 1, 0. 6(/ida,.Raf. Shell bifid by valves acute and gaping 

 before, outside black and rough, sides straight, length 3-8 of the 

 breadth, hardly one inch. Knobhills. 



37- Terehratulites Eriensis, 'B.&t 1%1%. Base smooth, remainder 



