GASTEROPODA. 117 



very fine densely-arranged longitudinal lines. The latter features are not exhibited by the 

 specimen from Scarborough ; but one, of more advanced growth, from the Inferior Oolite 

 near Minchinhampton, is much larger and more satisfactory. The upper portions of the 

 whorls are flattened, smooth, and even a little sulcated ; the inner lip is thin ; the base is 

 rounded, so that it neither exhibits the thickened lip of Littorina, nor the basal produced 

 form of Turbo. Length of the Scarborough specimen 5 lines, transverse diameter of the 

 last whorl 4 lines. 



Locality. Great Oolite near Scarborough. 



TURBO PHILLIPSII. Plate XV, figs. 12, 12a, b. 



T. Testa trochiformi, cingillatdque costatd ; costis striato-nodulosis ; striis indentis ; 

 striis lonffitudinalibus numerosissimis ; anfractibus planis ; apertufd subrotundd, basi effusd, 

 v el production. 



Shell trochiform, encircled with numerous ribs ; ribs striated and nodulous ; striae 

 longitudinal, very numerous, indenting the ribs ; volutions flattened ; aperture rounded ; 

 its base effuse, or produced anteriorly. 



Two ribs, more prominent than the rest occupy the middle of the last whorl, and give 

 it rather an angulated figure ; the pointed extremity of the base removes it from the 

 Littorina. Longer diameter 9 lines, transverse diameter 7 lines. 



Named in compliment to the author of the ' Geology of Yorkshire.' 



Locality. Great Oolite near Scarborough. 



PHASIANELLA LATITJSCULA. Plate XV, fig. 16. 



P. Testa ovatd, spird acutd, elatd; anfractibus (6) latis, convexiusculis ; anfractu 

 ultimo subventricoso. 



Shell ovate, spire acute, elevated; whorls (6) broad, convex, the last whorl rather 

 inflated. 



This may be considered as a form connecting our P. elegans and P. tumidula ; the 

 spire is much more elevated than in the latter species, and the whorls are wider than in the 

 former. These remarks, however, are made with the reservation which must be exercised 

 in describing casts, for the specimen figured is in that condition. The length is 1 inch, 

 the transverse diameter 7 lines. 



Locality. Near Scarborough. 



16 



