250 PLIOCENE MOLLUSCA. 



Mangilia indistincta, Monterosato. Plate XXIX, figs. 19, 20. 



1869. Mangelia coerulans, var., A])pelius, Boll, malac. ital., vol. ii, p. 137, pi. iv, fig. 1. 



1875. Marujelia indistincta, Monterosato, Nuova Riv. Conch. Medit., p. 43. 



1884. Mangelia indistincta, Monterosato, Nomen. gen. spec. Conch. Medit., ]). 129. 



1905. Mangelia indistincta, Kobelt, Icon, schalentrag. europ. Meeresconch., vol. iii, p. 342, pi. xciv,^ 



figs. 13, 14. 

 1910. Mangilia indistincta, CeruUi-Irelli, Palaeont. Itul., vol. xvi, p. 52, pi. v, fig. 3. 



Specific Cluiracfers. — Shell solid, ovato-fusiform ; whorls 7 — 8, slightly convex, 

 not angulated above, the last much the largest, two-thirds the total length ; 

 ornamented by strong longitudinal costse, narrower than the intervening spaces, 

 reaching the suture and the base of the shell ; suture fairly deep ; outer lip 

 thickened outside by the labial rib ; mouth oval, with a well-marked labial sinus, 

 passing without break into a short canal. 



Dimensions. — L. 10 — 12 mm. B. 4 — 5 mm. 



Disfrihution. — Recent : Tyrrhenian Sea, Sicily, Sardinia, Corsica, Prevesa, 

 Fossil : Waltonian Crag : Walton-on-Naze, Little Oakley. 



Upper Pliocene : Monte Mario. 



Bemarhs. — The fossil represented under this name is one of half a dozen I have 

 found at Oakley corresponding more or less nearly with a Recent specimen of 

 Maiujilia indistincta belonging to Mr. Tomlin, which he received from the 

 Marchese di Monterosato and has kindly allowed me to figure. Some of the 

 Oakley shells approach to some extent the form I have taken as the Crag repre- 

 sentative of M. Smitltii, but the body-whorl of the latter is wider and is not 

 angulated above. Prof. Kobelt, describing if. indistincta, says the last whorl is 

 more inflated than in M. ecBvuIans, of which Appelius originally regarded it as a 

 A'ariety. 



Mangilia ambigua (Brugnone). Plate XXIX, figs. 17, 18. 



1862. Pleurotoma ambigtmm, Brugnone, Mem. Pleur. foss. Palermo, p. 40, fig. 31. 



1875. Rapliitoma amhigua, Seguenza, Boll. R. Com. G-eol. Italia, vol. vi, p. 210, no. 227. 



1877. Mangelia amhigua, Bellardi, Moll. Terr. Terz. Piem., pt. ii, p. 289, pi. viii, fig. 33. 



1889. Mangelia amhigua, Sacco, Boll. Soc. Ital. Geol., vol. ix, p. 282, no. 4306. 



1896. Mangilia amhigua., Cossmann, Ess. Paluoconch. Comj)., vol. ii, p. 119. 



1914. Mangilia amhigua, Cipolla, Palaeont. Ital., vol. xx, p. 137, pi. xiii, fig. 5. 



Specific Characters. — Shell small, fusiform, fairly solid, turreted, slender ; whorls 

 7 or 8, somewhat convex, regularly decreasing in size, the last slightly more than 

 half the total length ; ornamented by eight or nine strong, clearly sculptured 



