69 



ROSTELLARIA Parkinsoni, 



TAB, CCCXLIX— Figs, 1 to 5. 



Spec. Char. Turreted, costated, transversely 

 striated ; last whorl tricarinated ; aperture 

 expanded, with a one-angled entire lip ; su- 

 perior canal short. 

 Syn. Strombus Pes Pelicani, Srocchi, II. 385. 

 Rostellaria, having only one spur-like 



process Parkinson, Vol. III. G3. 

 R. Parkinsoni, Mcmtell Geol. Sussex, 

 p. 72 and 108. 



A SHELL strongly resembling Strombus Pes Pelicani, 

 but well distinguished by the shortness of the superior 

 canal of the aperture ; and as Parkinson observes, by 

 there being only one process from the wing-like lip ; in 

 Pes Pelicani the upper canal has a process besides the 

 three that proceed from the lip ; the striae, costa;, and 

 sreneral form are the same in both. 



The fossil Strombus Pes Pelicani of Brocchi is pre- 

 sumed to be the same as the one before us ; but whether 

 the green sand species mentioned by Parkinson, see his 

 tab. 5, fig. 11, and by Mr. Mantell, be also the same, 

 until we have more perfect specimens for comparison 

 than have hitherto been met with, is very doubtful. 



The present species occurs in the London Clay, and 

 in the sandstones beneath it, but above the Chalk. 



Fig. 1 exhibits the natural cast of the inside in a 

 ferruginous sandstone, and the artificial cast of the outer 

 surface from the opposite impression in the same stone, 

 from Maidenhead, between Bray and Windsor ; given 

 me by Mr. Walter ; it is accompanied by several other 

 fossil shells known in the London Clay, in some of which 

 the shelly matter still remains, especially of Dentalia. 



