TURBO. 355 



289. " Tcrbo paludinoides." Plate XXIX, fig. 2. 



Description : 



Height ..... 10*5 mm. 



Width ...... 10-5 mm. 



Mean spiral angle .... 70°. 



Shell smooth, conical, turbinate, imperforate ; substance rather thin. The apex 

 is rather obtuse, with a change in the spiral angle about the third whorl. Total 

 number of whorls six or seven, convex, and well marked off by the suture ; without 

 ornament, and rather glabrous, though fairly wide growth-lines are visible in some 

 portions of the shell. The body- whorl slightly exceeds one-half of the total height, 

 and is regularly convex throughout, with a full and rounded base. Aperture fairly 

 wide and circular, outer lip thin; columella excavated, but only moderately 

 encrusted, and marked by a narrow sinuous furrow. 



It is not intended that this form, though figured, should take rank as a species 

 until we know something more of its true relationships. The aperture is more 

 circular than in Bourguetia ; at the same time the shell is very thin for a Turbo, 

 whilst the sutures are rather too close for a Paludina. 1 A single specimen, 

 presumably from the Concavus-bed of Bradford Abbas. 



290. Turbo (? Ataphrus) Lindecolinus, sp. nov. Plate XXIX, figs. 3 and 4. 



Description .- 



Height . . • . .9 mm. 



Width . . . . .7-5 mm. 



Mean spiral angle .... 55° — 60°. 



Shell conical, turbinate, rather thick, not umbilicated; spire slightly obtuse. 

 Number of whorls six, smooth, convex, and well marked off by the suture. The 

 body-whorl is about half the entire height, smooth, regularly convex, and with no 

 other indication of ornament than curved growth-lines ; basal angle rounded, base 

 full and smooth. Aperture subcircular and rather small ; outer lip thin and 

 semilunar ; columella short and inclined to be straight, with a moderate callus, and 

 in some specimens a slight columellar furrow. 



1 N.B. — There is a bed in the Chipping Norton district, somewhere about the junction of the 

 Inferior and Great Oolites, which yields a species of Paludina in considerable quantities. 



