210 R. Sullen Newton — Miocene 8hellsfrom Egypt. 



outwardly a series of depressed ribs ; both valves beiug convex and 

 sligbtly gaping. 



Horizon. — Miocene (Helvetian). 



Distribution. — Bordeaux ; Gironde ; Portugal ; Sardinia ; the 

 Azores ; Vienna Basin ; Constautine, etc. Egypt : Jebel Geneffe 

 (Fuchs) ; 9 kilometres S.S.W. of Camp 22. Coll. Geol. Surv. 

 Egypt, No. 355, Box No. 15a. 



PECTEN, sp. 



Kemarks. — Three valves of different pectinoid shells, too 

 imperfect for determination. 



Horizon. — Miocene (Helvetian). 



Distribution. — Egypt : Camp 22. Coll. Geol. Surv. Egypt, 

 No. 324, Box No. 26^ a. 



Genus AMUSSIUM [AMUSIUM], Chemnitz. 

 Conchyl. Cabinet, vol. vii (1784), p. 284, pi. Ixi, fig. 595. 

 Type. — Ostrea pleuronectes, Linnseus. 



AMUSSITJM CRISTATUM, Bronn, sp. (PI. VIII, Fig. 6.) 

 Ostrea pleuronectes, Brocchi : Conch. Foss. Subapennina, vol. ii (1814), p. 573 



{non Linnaeus). 

 Fecten cristatus, Bronn : Zeitsch. Mineralogie (Leonhard), vol. ii (1828), p. 542. 



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



vol. iv (1867), p. 419, pi. Ixvi, fig. 1. 

 Amussium cristatum, Sacco : Moll. Terz. Piemonte, etc., 1897, pt. xxiv, p. 47, 



pi. xiii, figs. 30, 31 ; pi. xiv, fig. 1. 

 Peeten cristatus, Eepelin : Bull. Soc. Geol. France, ser. in, vol. xxv (1897), p. 130. 

 Fecten {Cornelia) cristatus, Mayer-Eymar : Palfeontographica, 1898, vol. xxx, 



pt. 2, p. 65. 



Description. — Shell depressed, nearly orbicular, with a smooth 

 outer surface, and internally possessing 26-32 elevated, radial 

 costse, which are acuminate and slightly curved at their terminations, 

 and do not quite reach the ventral margin. 



Eemarks. — This species is represented in the collection by a 

 single fragment attached to a lower valve of Peeten acuticostatus. 

 It is the internal portion of a valve showing three pairs of costal 

 rays with bent acuminate ends, the intervening space between each 

 pair having a maximum width of 9 millimeti-es. According to 

 Mayer-Eymar this species ranges from Helvetian to Sicilian times 

 in the neighbourhood of the Pyramids. 



Horizon. — Miocene (Tortonian). 



Distribution. — Vienna Basin ; Southern France ; Italy ; Sicily ; 

 Sardinia; Algeria (Eepelin), etc. Egypt: probably from Camp 21. 

 Coll. Geol. Surv. Egypt, No. 365, Box No. 20^ a. 



Genus SPONDTLUS, Linnaus. 

 Systema Naturae, 10th ed. (1758), p. 690. 

 Type. — S. gmderopus, Linnaeus. 



SPONDYLUS, sp. 

 Spondylus, sp., cf. crassicostatus, Fuchs : Palaeontographica, vol. xxx (1883), 

 p. 25 (43), pi. viii (iii), fig. 14. 



Description. — The valves are suborbicular, compressed, and 

 ornamented with fine, closely arranged, tortuous ribs, Avhich separate 



