JS. Bullen Newton — Miocene Shells from Egypt. 213 



Tellina lacunosa, Hoernes, " Foss. Moll. Tert.-Beck. Wien" : Abhandl. k. k. geol. 



Eeichs., vol. iv (1859), p. 91, pi. ix, fig. 1. Fuchs : Denk. Akad. Wiss. (Wien), 



vol. xxxviii (1878), pt. 2, p. 36. 

 Tellina tumida, Seguenza, " Form. Terz. Reggio (Calabria) " : Mem. Atti E. Accad. 



Lincei, ser. iir, vol. vi (1880), p. 73. 



Description. — Shell roundly ovate, ventricose, possessing a wide 

 pnstero-median depression in the right valve and a peculiarly twisted 

 ventral region. 



Dimensions. — Height, 48 mm. ; length, 53 mm. ; diameter, 25 mm, 



Eemarks. — Represented by some casts exhibiting attached valves, 

 which have been compared with recent examples of this species 

 from Guinea, and found to agree in all essential details. They 

 show the central depression of the right valve, a more inflated 

 left valve, and the typical flexuosity of the ventral area. No scar 

 impressions are visible, but the posterior oblique area, reaching 

 from the beaks to the in fero- ventral margin, is well defined. Two 

 valves. Box No, 48^ c, are doubtfully referred to this species ; they 

 may be young forms. 



Horizon. — Miocene (Burdigalian), 



Distribution. — Eecent, from the Guinea Coast ; fossil from Italy, 

 Switzerland, South of France, Vienna Basin, etc. Egypt : Jebel 

 Geneffe (Fuchs) ; Camp 6 (52a) and S.E, Camp 19 (48^ c). Coll. 

 Geol. Surv. Egypt, No. 641, Box No. 52a ; No. 871, Box No. 48^ c. 



Genus MEEETRIX, Lamarck. 

 Mem. Soc. Hist. Nat. Paris, 1799, p. 85. 

 Type. — Venus meretrix, Linnaeus. 



MEEETEIX EETCINA, Linnssus, sp. 

 Venus erycina, Linnaeus: Systema Naturae, vol. i (1767), pt. 2, p. 1,131. 

 Cytherea erycinoides, Lamarck: Hist. Nat. Anim. sans Vert., vol. v (1818), p. 581. 

 Gallista erycina, H. & A. Adams : Genera of Eecent Mollusca, vol. ii (1867), p. 425. 

 Cytherea erycina, Hoernes, " Foss. Moll. Tert.-Beck. Wien" : Abhandl. k. k. geol. 



Reicbs., vol. iv (1861), p. 154, pi. xix, figs. 1, 2. 

 Cytherea erycinoides, Seguenza, " Form. Terz. Reggio (Calabria) " : Mem. Atti E. 



Accad. Lincei, ser. in, vol. vi (1880), pp. 62, 60, 119. 



Description. — Shell transversely oval, cuneiform ; wide, short, 

 and round anteriorly ; round, acuminate, and produced in rear ; 

 surface ornamented with depressed concentric sulcations. 



Dimensions (valves in situ). — Height, 48 mm.; length, 37 mm.; 

 diameter, 23 mm, 



Eemarks. — The Egyptian specimens referred to this species 

 are somewhat obscure and imperfect, though that from which the 

 above dimensions are taken is in fairly good condition and shows 

 the shape of the shell as well as the typical parallel, obtuse 

 sulcations which ornament its valves. There is a long synonymy 

 to the species which is well set out in Hoernes' work, but not 

 repeated here. 



Horizon. — Miocene (Burdigalian). 



Distribution. — Bordeaux ; North and South Italy ; Gironde 

 Basin ; Ehone Basin ; Portugal ; Yienna Basin, etc. Egypt : 

 Camp 6. Coll. Geol, Surv. Egypt, No. 640, Box No. 51a. 



