18 SYEIAN MOLLUSCAN FOSSILS. 



spire, and seems therefore more .ippropriately to bear that generic name. 

 Coll. Bird. 



Locality and Position. — Abeih; from the arenaceous portion of the Turo- 

 nian marl. 



TYLOSTOMA Sharpe. 



This genus, instituted by Sharpe in 1849 (Quart. Journ. Geol. Soc. Lond., 

 V, p, 376), is identical with Varigcra, designated by d'Orbigny in 1850 

 (Prodr. de Paleont, 11, p. 103). It is characteristic of the Cretaceous system 

 in Portugal, from which Sharpe described four species. Pictet and Campiche 

 have since named eight from the Cretaceous beds of Sainte-Croix, Switzer- 

 land, and still later (1867) Stoliczka has recorded three species from the 

 Cretaceous of Southern India ; but the genus has not been recognized 

 hitherto among the fossils of Syria. It is assigned to the family Naiicidce. 



Tylostoma Birdanum, sp. nov. 



Plate I, fig. 4. 



Testa ovaio-elon(juta, subliirrila ; sjn'ra data, conlca, acuminata : anfractiis scptcm 

 convexi, vix gradati, striis incremenii crassioribus insigniti, vuricihis externis prope 

 continuis in ordines duos fere oppositos redactis muniti ; vltimns longitudincm spirce 

 paido siiperans et latior qiiam longior ; sidura pirofunda : apcrtura ovato-liinata, antice 

 roiundata, postice angido acuta terminans ; columella rimidata. 



Shell ovate-elongate, subturreted ; spire elevated, conical, acuminate : 

 whorls seven, convex, very slightly tabulated at the posterior margin, 

 marked with rather heavy lines of growth, and bearing two rows of nearly 

 continuous varices, distant from each other about half a volution ; last whorl 

 but little longer than the spire and wider than long ; suture deep : aperture 

 ovate-lunate, rounded in front and terminating behind in an acute angle; 

 columella slightly fissured. 



The species is described from a single specimen of the following dimen- 

 sions : length in j)resent condition, 38 mm. ; original length, aj^proximate, 

 40 mm. ; length of body-whorl restored, 21 mm. ; its width, 27 mm. ; length 

 of spire measured from body-whorl, 19 mm. 



Tlie specimen here described is one of very few of its genus which have 

 been found retaining the test. The only parts wanting are a small trian- 



