TYLOSTOMA SYRIACUM. 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 

 exhibitino; well-marked external varices on the front of the three laro-est 

 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 iu 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 ScarabccKS. 



I 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. Rochatummn Pictet and Campiche, from " I'Etage 

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

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

 and is proportionally longer and narrower. Coll. Bird. 



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

 nian marl. 



Tylostoma Syriacura Coxrad sp. 



riate I, flss. 6 a, 1), and Plate II, fig. 10. 



Cheiiopus Si/riacH.i CoxKAi), 1S52, Official Report, p. 220, PI. xii, fig. 71. 

 ? Nalica elalior* Coquaxd, 1862, Geol. et Paleout. de Couslaiitiue, p. 170, PI. iii, fig. 5. 

 ? Tj/lostoma fallax Piciet and Campiche, Sept., 1862, Foss. du Terr. Cret. de Stc. -Croix, IT, p. 331, PL 

 Ixxiii, figs. 3, 4. 



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

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

 G ff, i) : length, shortened at tip of spire, 83 mm.; original leugth, approx- 

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

 (PL ii, fig. 10): length, spire shortened a little, 70 mm.; original length, 

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



That the fossils to which I have assigned the name Tf/Moma S//ri(/rum 

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

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



* III Coquaiid's £.liides svpjtlemenlaires sur la Valtontologie Algerienne, 1880, received siuce the above 

 was written, tlie autlior lias eliauged the uanic of his Natica elalior to Tylostoma elatius. 



