Vol. 67.] KAINOZOIC MOLLTJSCA FROM CYRENAICA. 633 



imbricated surface adorns the summits of the costae. The valves 

 vary in size as the originals figured by Fuchs, being generally of 

 the same length as height, one of the largest yielding the following 

 measurements: — Dimensions (left valve).— Length= 43 milli- 

 metres; height = 43mm. 



Occurrence. — Mostly in a marly-looking greyish limestone, 

 sometimes weathering reddish-brown, with Opevculina and Litho- 

 thamnion. 



Localities. — Cyrene ; Ain Sciahat; Ain Sciahat, above camp; 

 before the shrine of Sidi Mahomet Mahridi, east of Slonta ; west of 

 Labruk. 



^Eqjtipecten camaretensis (Fontannes). (PL XLV, figs. 5 & 6.) 



Pecten camaretensis Fontannes, ' Etudes Periode Tert. Bassin du Rhone : pt. 3, 

 Bassin de Visan ' 1878, pi. iii, fig. 2 & p. 90. 



Remarks. — This form of pectinoid shell is represented by several 

 specimens in different states of preservation, although a more com- 

 plete valve is available for examination which does not belong to 

 Prof. Gregory's collection, but was presented to the British Museum 

 (Natural History) some time since by Mr. H. Weld-Blundell, who 

 obtained it from the rocks at the Fountain of Apollo, Cyrene. It 

 shows the subrotund and characteristic form of the species, together 

 with the sixteen or seventeen rounded radial costse widely sepa- 

 rated in the ventral region and covered with numerous delicate 

 squamose concentric lines, the intermediate grooves being orna- 

 mented with longitudinal rows of minute scabrous growths. Parts 

 of both auricles are present, ornamented with fine lines of radial 

 granulations. 



Dimensions (left valve). — Length = 50 mm. ; height = 50 mm. 



The species is characteristic of rather low Helvetian, being found 

 in the Yisan area of France with Ostrea crassissima, as originally 

 mentioned by Fontannes. A varietal form is figured and referred 

 to by Prof. Sacco as occurring in corresponding beds of Italy, 1 which 

 he includes under Matheron's P. scabriusculus ; while Dr. Blancken- 

 horn records a related form (cf. camaretensis) from the Miocene of 

 Bark a in Cyrenaica. 2 



Occurrence. — The specimens are in a greyish sandy matrix 

 containing Opevculina. 



Localities. — Fountain of Apollo, Cyrene; Ain Sciahat, above 

 camp ; Ain Sciahat. 



./Eqtjipecten scabrellus (Lamarck). 



Pecten scabrellus Lamarck, ' Hist. Nat. Anim. sans Vert.' 1819, vol. vi, pt. 1, 



p. 183. 

 JEquipecten scabrellus Sacco, 'Moll. Terr. Terz. Piemonte' 1897, pt. 24, pi. viii, 



figs. 1-6 & p. 24. 



Remarks.' — According to Prof. Sacco, this species is character- 

 istic of the Helvetian Miocene, although certain varieties occur in 



i ' Moll. Terr. Terz. Piemonte' 1897, pt. 24, pi. ix, fig. 2 & p. 32. 



2 Zeitschr. Deutsch. Geol. Gesellscli, vol. liii (1901) pp. 104, 108, 123. 



