666 PROF. J. W. GREGOET ON [Nov. IQII, 



Dimensions in 

 millimetres. 



Cy60. 



S. striatula 

 Cotteau's fig. 



£. tenera 

 Laube. 



S. cavipetala 

 Laube. 



Length 



50 

 57 



11 

 6 



22 



50 

 52 



13 

 5 



23-5 



56 

 58 



11 

 5'5 



25 



67 



Breadth 



Antero-lateral petal : — 



Length 



Breadth 



Distance from proximal 

 end of that petal to 

 margin of test 



68 



16 



8 



32 







Distribution. — Lower Oligocene : Tongrian of Northern Italy ; 

 in the tuffs at Laverda, Gnat a di JSalcedo, and Sangonini di Lugo, 

 In Cyrenaica, in the Slonta Limestones at Labruk (Cy 60) ; Bir Hu, 

 5 miles south of Cyrene (Cy 297) ; and ? north of Ain Sciahat 

 (Cy 73). 



Affinities. — Dames has pointed out that the depression of the 

 petals in S. cavipetala was due to pressure, and that the species 

 must be merged in S. tenera. 



This species is represented by three specimens ; but the third, 

 found at Ain Sciahat, is poorly preserved, and its identification is 

 somewhat doubtful. 



The species resembles in outline Scutella ammonis Fuchs, from 

 the Miocene of Siwa, which has, however, longer petals. In 

 S. tenera the ratio between the length of the anterior petal and 

 the distance from its inner end to the edge of the test is as 11 : 27, 

 whereas in S. ammonis the ratio is as 16:29. The petals of 

 JS. tenera are also broader and more ovate than in S. ammonis. 



Scutella tenera is unquestionably closely allied to S. striatula 

 Marc, de Serr., the well known Lower Oligocene species, the range 

 of which has been extended down to the Middle Eocene by Cotteau ] 

 in the Gironde, and to the Priabonian by Commander Flick in 

 Tunisia. 2 Laube's figure of S. tenera has a less sinuous outline, 

 but that of his S. cavipetala agrees with that of S. striatula ; and 

 S. cavipetala having been merged in S. tenera, the regular outline 

 is not available as a distinction. Laube remarked, as a character 

 separating S. tenera from 8. striatula, that in the former the petals 

 are wider in proportion to the length ; and according to that feature, 

 as shown by the above table of dimensions, the specimens from 

 Cyrenaica agree with JS. tenera. 



Scutella sp. 



A large Scutella with long petals occurs in the limestone on 

 the plains east of Benghazi ; but the fragments collected are 

 undeterminable, and I was unable to return to the locality to get 



1 ' Ech. Eoc, Pal. Fran?. : Terr. Tert.' vol. ii (1891) p. 242. 



2 ' Priabonien en Tunisie ' C. P. Acad. Sci. Paris, vol. cxxx, p. 149. 



