■R. Bullen Newton — Shells from Raised Beaches^ Red Sea. 549 



specimen and some young forms (No. 2,109, Box No. 32;'; Nos. 

 2,121-2,138, Box No. 50/). 



Alectryonia, allied to crista-galli, Linnaeus. (PL XXII, Figs. 5, 6.) 

 Mytilus crista-galli , Linmuus : Systeraa Natur<\j, 10th ed. (1758), p. 704. 



A short, deeply plicated form, ornamented with wide transverse 

 lamellae. Cardinal line horizontal, with a small central triangular 

 ligamental area. There is only one specimen of this shell in the 

 collection, both valves being in contact, one being rather fragmentary. 

 It is, however, particularly well marked, and appears to be inter- 

 mediate between A. crista-galli and A. turhinata, Lamarck (Hist. 

 Nat. Anim. sans Vert., 1819, vol. vi, pt. 1, p. 212), both of which 

 are Indian Ocean species and prominently plicated. This example 

 is probably an extinct form. 



Dimensions. — Height 45 mm., width about 40 mm. 



Coll. Geol. Surv. Egypt : raised beach north of Kosseir (Nos. 

 2,121-2,138, Box No. bOj). 



Alectryonia Virleti, Deshayes. 

 Ostrea Virleti, Deshayes: Exped. Sci. Moree, vol. iii (1833), pt. 1 (MoUusques), 

 pp. 122-124, pi. xxi, figs. 1-6. 



This species is accompanied by casts of Anadara radiata, Dosinia 

 radiata, Lcevicardium like oblongum, etc. 



Distribution. — Miocene of Morea (Deshayes) ; Armenia (Abich) ; 

 Persia (Fuchs) ; Egypt (Fuchs, etc.) ; Pliocene of Italy (Gregorio, 

 etc.). Coll. Geol. Surv. Egypt: plain east of Jebel Mellaha, low 

 range east of Red Sea Hills (No. 2,255, Box No. 337t) ; beach No. 2, 

 north-west of Camp 40, plain east of Jebel Mellaha, east of Red Sea 

 Hills (No. 2,193, Box No. 'SOh) ; foothills of Jebel Dara, Wadi Dara 

 (No. 2,261, Box No. 3^). The specimen from the last-mentioned 

 locality consists of a fragmentary valve, and is therefore of doubtful 

 determination. 



Family PECTINID^. 



Pecten lividus, Lamarck. 



Feefeu lividus, Lamarck : Hist. Nat. Anim. sans Vert., vol. vi (1819), pt.l, p. 178. 



A fragment of this species partly encrusted with a small form of 

 Balanus. 



Distribution.— Red Sea, Mauritius, Aden (E. A. Smith) ; Red 

 Sea (Issel). Coll. Geol. Surv. Egypt: raised beach north of Kosseir 

 (Nos. 2,121-2,138, Box No. 50/). 



Pecten Vasseli, Fuchs. (PL XXII, Figs. 7-9.) 



Fecten Vasseli, Fuchs: Denksch. Math. nat. CI. k. Ak. Wiss., vol. xxxviii (1877), 



p. 40, pi. ii, fig. 3. 

 Syx. Fccten radtda, var. subfossilis, Fraas : Aus dem Orient, 1867, p. 189. 



This species is distinct from all others, and is not known in 

 existing seas. It is a rounded, shallow shell, characterized by 

 possessing dichotomizing ribs, which, together with the intermediate 

 grooves, are finely sculptured with almost microscopic, closely-set, 

 transverse striations. In worn examples the stri» are scarcely 

 evident on the ribs themselves. Dimensions of an adult lower 

 valve : height 57, width 63, depth 15 mm. 



