28 DUJTDRY GASTEROPODA. 



descriptions, whicTi may be restorations of imperfect specimens. 

 The absence of the little sharp tubercles or spines on the ridges 

 is an accident of fossilisation probably. Though absent in our 

 figured specimen, they are well seen on another, which is plainly 

 and unmistakeably identical with it. 



The characteristic distinction of this species then we take to be 

 the greater size and prominence of two of the ridges on the middle 

 of the whorl, which leave an impression on the mould. 



Below these on the last whorl are 4—5 others ; all bear small 

 spines at intervals. The aperture when preserved is round with 

 an outline like the section of a fluted column. 



T. eapitaneus, IMu. seems to diff'er at first sight by the absence 

 of a ridge between the larger ones and the suture, but it is 

 doubtful whether this is a constant character, for it is absent in 

 one of our specimens on the last, but not on the other whorls. It 

 seems to me that T. spimdosus is merely a synonym of this 

 species. If T. capitaneus and spmulosus are really distinct species, 

 then Sowerby's appellation should fall to the ground, for it 

 includes both. It is a pity that his figures are so imperfect. 



Oppel cited T. capitaneus from Frocester Hill, (Juraf. p. 386,) 

 but not Littorina ornata. He notices however P. Belia, D'Orb., 

 from Bridport. This latter shell is considered by Laube, and 

 again by Brauns (Mittel-Jura. p. 177) as a synonym ; but herein 

 they labour perhaps under a mistake. " Dr. Lycett (Ann. Mag. 

 Nat. Hist. 1857, p. 176) cites T. capitaneus from the ''Upper 

 Lias Sands." Moore also cites it from the Upper Lias. 



There are ten specimens in the Museum. 



Locality— Dundry, Midford, &c. Inf. Ool, 



AMBEELEYA, sp. PI. 2, fig. 5. 



Length 45 mm. (if complete.) 



We have the cast of a shell which much resembles in form 

 Amlerleya nodosa, Lye. and Morris. Part' of the shell being left 

 near the base of the last whorl, we notice that there were spiral 

 ridges with oblique cross markings, as in ^. ornata^ Sow. 



