TYLOSTOMA SYEIACUM. 19 



gular portion of the anterior extremity, a little of the outer lip, and a small 

 oval patch on the dorsal side of the penultimate whorl, where is found a 

 perforation into the interior of the shell. The specimen is remarkable for 

 exhibiting well-marked external varices on the front of the three largest 

 whorls, distinguishable also upon the back, but less perfectly preserved. 

 They are remains of somewhat dilated margins of successive outer lips, 

 directly within which occur the internal varices characteristic of the genus, 

 but not visible in our example. In several species no traces are found of 

 external varices, which therefore have been regarded as not of generic value, 

 though in some instances they may have been worn away, as often happens 

 to shells of Scarabceus. 



1 have named this species after Rev. William Bird, missionary of the 

 American Board, now and for many years stationed at Abeih. In the spire 

 it closely resembles T. Rochatianum Pictet and Campiche, from " i'lStage 

 Aptien inferieur," (Descr. des Foss. du Terr. Cret. de Stc. -Croix, II, p. 356, 

 PL lxxiii, figs. 12, 13,) which, however, is not known to have external varices, 

 and is proportionally longer and narrower. Coll. Bird. 



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

 nian marl. 



Tylostoma Syriacurn Conrad sp. 



Plate I, figs. 6 a, b, and Plate II, lig. 10. 



Chenopus Syriaeus Coneab, 1852, Official Report, p. 220, PI. xii, fig. 71. 



I elatior* CoQl \\i>, 18G2, Geol. et Paleonf. de Constantino, p. 179, Fl. hi, fig. 5. 

 ? Tylostoma fallax Pictet and Campiche, Sept., 1862, Foss. du Terr. Cret. de Ste. -Croix, II, p. 331, PI. 

 lxxiii, tigs. ;>, 4. 



Five interior casts, of which three are very imperfect. Of the best two 

 the following are the dimensions. The larger, Coll. Merrill (PI. i, figs. 

 6 a, b): length, shortened at tip of spire, 83 mm.; original length, approx- 

 imate, 92 mm.; width, compressed, 45 nun. The better. Coll. Thomson 

 (PI. ii, fig. 1(1): length, spire shortened a little, 70 mm.; original length, 

 about 75 mm. ; width, natural, 44 mm. 



That the fossils to which 1 have assigned the name Tylostoma Syriacurn 

 may be identified with absolute certainty, comparison should be made with 

 Conrad's type; but his Syrian types are not at present to be found. There 



* In Coquand's Etudes supplementaires sur la PaleorUologie dlgirienne, 1880, received since (lie above 

 was written, the author has changed the name of Ilia Watica elalior to Tylostoma elatius, 



