R. BuUen Newton — Miocene Shelhfrom Egypt. . 207 



PECTEN ADUNCUS, Eichwald. 

 Feden aduncus, Eichwald : Natur. Skizze Lithauen, Volkyrden, und Podolien, 



1830, p. 213. 

 Tecten Josslingi, G. B. Sowerby : Quart. Journ. Geol. Soc, vol. iii (1847), p. 419, 



pi. XTi, figs. 10-12. 

 Ftcten convexo-costatus, Abich, " Ueber Steinsalz, etc., Ruasischen Armenien": 



Mem. Ac. Imp. Sci. St. Petersbourg, ser. yi, vol. ix (1859), pt. 1, p. 118, pi. i, 



fig. 4, 

 Fecten aduncus, Hoemes, " Foss. Moll. Tert.-Beck. "Wien": Abbandl. k. k. geol. 



Eeicbs., vol. iv (1867), p. 401, pi. lix, figs. 7-9. Fuchs: Palseontographica, 



vol. XXX (1883), p. 36 (54), pi. xix (xiv), figs. 1-5. 



Description. — Species with very convex lower valve and a 

 rounded, incurved umbone ; costee about 17, rounded, wide, 

 smooth, and separated by conspicuous sulci, or grooves, which 

 are ornamented with fine concentric striations ; upper valve 

 flat, with 12 narrow costse, more or less obsolete at the umbone. 

 Dimensions (of larger upper valve). — Height and length, 40 mm. 

 Eemarks. — Two upper valves of this species are contained in 

 the collection, the larger having its inner surface covered with 

 parasitic annelid tubes and a bryozoan (^Gellepora) . 

 Horizon. — Miocene (Helvetian). 



Distribution. — Poland (Eichwald) ; near Lisbon (G. B. Sowerby) ; 

 Eussian Armenia (Abich) ; Vienna Basin (Hoemes). Egypt: Nile 

 Valley (Fuchs) ; Camp 22. Coll. Geol. Surv. Egypt, No. 324, Box 

 No. 26^^^^ a. 



PECTEN BEUDANTI, Basterot. 

 Fecten Beudanti, Basterot, " Desc. Tert. Sud-Ouest France " : Mem. Soc. Hist. Nat. 

 Paris, vol. ii (1825), pt. 1, p. 74, pi. v, figs. \a-c. Hoernes, "Foss. Moll. 

 Tert.-Beck. Wien": Abhandl. k. k. geol. Eeichs., vol. iv (1867), p. 399, 

 pi. lix, figs. 1-3. Sacco : Moll. Terz. Piemonte, etc., 1897, pt. xxiv (Pectinidae), 

 p. 62, pi. XX, figs. 1-8. 



Description. — Species characterized by its valves bearing very 

 elevated, rounded, and radial costgs (14-16), ornamented with fine, 

 closely-set, regular, lamellose, and transverse striee. The lower 

 valve is very convex, furnished with an incurved umbone, a 

 moderately short cardinal line having vertically striated auricles 

 of apparently equal size ; the upper valve is flat and sometimes 

 rather concave. 



Dimensions (of largest lower valve). — Height, 85 mm,; length, 

 95 mm. ; diameter, 20 mm. 



Remarks. — This species need not be confused with either 

 P. solarium of Lamarck or P. Tournali, which are forms of 

 somewhat similar ornament, but possessing a convexity in both 

 valves. Sacco's examples from Italy, although of rather smaller 

 size and recognized under varietal names, appear to exhibit the 

 general structural features of this species. The occurrence of 

 this shell in Egypt is recorded here for the first time. 



Horizon. — Miocene (Helvetian), 



Distribution. — Bordeaux ; Portugal (Sowerby) ; Constantine 

 (Coquand) ; Italy ; Switzerland ; Vienna Basin, Egypt : Camp 

 22. Coll. Geol. Surv. Egypt, No. 322, Box No. 14a. 



