104 MOLLUSCA FROM THE GREAT OOLTTE. 



Act^onina? parvula, Boemer, sp. Plate V, figs. 11, 11a, 12. 



Buccinum parvulum, Roemer. 1836. Nordd. Oolith., p. 139, t. xi, fig. 23. 

 Acteonina pakvula, If Orb. 1850. Prod. Paleont., p. 353. 



A. Testa parvd, ovato-conicd ; anfractibus (4) subconvexis super ioribus, lateribus sub- 

 planis ; aperturd Integra elongatd, basi angustatd, columella contortd. 



Shell small, ovately conical ; whorls (4) rather convex upon their upper portions, but 

 flattened upon their sides ; aperture entire, elongated ; base narrow ; columella twisted. 



This little shell varies much in the length of the spire, specimens with narrow whorls 

 having a greater degree of convexity at their upper part than the others, but in all of them 

 the spire is shorter than the last volution. The largest specimens have an axis of 4 lines, 

 and a transverse diameter of nearly 3 lines. 



Locality. Minchinhampton. It is found not unfrequently in all the quarries of the 

 district, and is common to the shelly beds. 



Act/Eonina? bulimoides. Plate VIII, fig. 15. 



A. Testa ovato-elongatd, lavi ; spird elatd obtusd ; anfractibus (3 — 4) subconvexis, 

 anfractu ultimo subcylindrico ; aperturd ovatd ; labro sinistro incrassato. 



Shell ovately elongated, smooth, with an obtuse elevated spire ; whorls (3 — 4) some- 

 what convex, the last whorl subcylindrical ; aperture ovate ; inner lip thickened but not 

 broad. 



The general figure is pupgeforni ; the aperture in length does not exceed half that of 

 the entire shell. 



This species has been provisionally arranged under Actceonina, although the great 

 thickness of the shell and expanded columellar lip do not well agree with that genus, and 

 rather approximate it with Bulimus. In general form it is very near to the Chemnitzia 

 Cornelia, D'Orb., ' Terr. Jurass,' t. 245, figs. 2, 3, from the Coral Rag of France ; and 

 both species may hereafter be found to belong to a genus distinct from Chemnitzia and 

 Actceonina. 



Locality. Minchinhampton. The specimen figured is the only example which has 

 come to our knowledge. The exact bed from which it was obtained is rather doubtful ; 

 but, judging from the matrix to which it is attached, we should infer that its position was 

 probably the upper portion of the Great Oolite. 



