1873.] TATE PALEONTOLOGY OP SKYE AND RAASAY. 349 



indeed the specimens with an eroded spire, which are by far the 

 more numerous, very well agree with Actceon minimus, D' Archaic, 

 from the Bath Oolite. Nevertheless the callous columella and 

 subeffnse lip indicate an alliance with the Melaniadce, amongst 

 which the present species recalls many forms of Melanopsis and 

 Ptychostylus, but differs from the first by its entire lip, and from 

 the second by its non-plicated columella. The genus Melania, re- 

 stricted to the shells with a loop-like aperture, seems to offer the 

 best reception. 



Hydrobia calesonica, nov. spec. PI. XII. fig. 8. 



Shell small, cylindrical, attenuated at the apex ; whorls 6, gra- 

 dually enlarging, slightly convex, transversely wrinkled ; body- 

 whorl with a submarginal varix ; aperture ovate ; peristome entire ; 

 base imperforate. 



Dimensions. Length ^ inch, breadth -J^ inch. 



Horizon. Infra-Oxfordian estuarine beds, Loch Bay, Dunvegan 

 (J. B.). 



Paludina scotica, nov. spec. PI. XII. fig. 3. 



Shell black, obtusely ovately turbinated ; whorls 8 ('?), moderately 

 convex, densely transversely striated ; base with a slight umbilical 

 furrow. 



Dimensions. Height 1 inch nearly, breadth *7 inch. 



Horizon. Infra-Oxfordian estuarine beds, Loch Bay, Dunvegan 

 (J. B.) ; Vaterstein (E. T.). 



Leptoxis trochipormis, nov. spec. PL XII. fig. 4. 



Shell trochiform, few-whorled ; base rather flat, imperforate ; 

 aperture oblique ; whole surface ornamented with graved lines, 

 longitudinally and obliquely transverse. 



Position. Infra-Oxfordian estuarine beds, Loch Bay (</. B.). 



AxOMIA iESTUARINA, nOV. Sp. PI. XII. fig. 12. 



Upper valve hemispherical; umbone central and submarginal; 

 surface densely radiately costate ; costse but slightly elevated, and 

 somewhat undulose. 



Position. Infra-Oxfordian estuarine beds, associated with Mytilus 

 cuneatus ?, North Cliffs, Portree. 



Cyrena (Miodon) brycei, nov. spec. PI. XII. fig. 1. 



Transverse, ovate-trigonal, compressed or subventricose, consider- 

 ably inequilateral ; umbones small, subacute ; anteally rounded, 

 short ; posteally produced ; lunule inconspicuous ; ornamented with 

 a few slightly imbricating folds of growth. 



Dimensions. Length -fa inch, breadth T 8 F inch, thickness -p^inch. 



Horizon. Infra-Oxfordian estuarine beds, Stafnn (B. T.) ; Tor 

 Vaig, near Portree {11. T.) ; and Loch Bay, Dunvegan (J. B.). 



This species is variable in shape. The cuneate form which I have 



VOL. XXIX. — PART I. 2A 



