52 JURASSIC BIVALVIA AND GASTROPODA 



shell figured by Cossmann (1913a), who considers each pair of lines to mark the bases 

 of attachment of concentric lamellae which formed the ornament of the uneroded 

 shell. 



Entolium cingulatum (Goldfuss) 



PI. 6, fig. 5 



1836. Pecten cingulatus Goldfuss : 74 (partim), pi. 99, figs. 3a, b(}). 

 1926. Entolium cingulatum (Goldfuss) ; Staesche : 93, pi. 4, figs. 3, 4. 



Material. One valve (counterparts), no. LL. 35202. 



Locality and horizon. 5 miles N.E. of Tengeni (village on Pangani river), at 

 S. end of divide separating western tributary from main Maweni valley ; Upper 

 Jurassic. 



Remarks. This specimen, a valve about 30 mm. high, clearly shows the two 

 internal laminae, diverging from the beak and forming very acute angles with the 

 dorsal margins of the body of the shell, which are characteristic of this and certain 

 related species. There has been some difference of opinion as to the exact species to 

 which Goldfuss's name cingulatus should be applied. In his original description 

 Goldfuss attributed the species to Phillips and gave a reference to a figure published 

 by that author (1829, pi. 5, fig. 11), representing a specimen from the Oxford Clay of 

 England. Phillips, however, had merely recorded his specimen as Pecten sp. and for 

 that reason it had been given the name Pecten phillipsii by Thurmann (1833 : 32). 

 Thus Goldfuss, not Phillips, was the author of the name cingulatus, and when describ- 

 ing the species he recorded it from localities belonging partly to the Lias and partly 

 to the White Jura, without stating from which his figured specimens came. D'Orbigny 

 (1850a : 238, 257) assigned the names Pecten philenor and P. proeteus to species found 

 at different horizons of the Lias, in each case referring to Goldfuss's figures of P. 

 cingulatus. Staesche has maintained that this action amounted to the restriction of 

 Goldfuss's species to specimens from the White Jura, a doubtful conclusion, particu- 

 larly in view of the fact that d'Orbigny did not adopt the name cingulatus for speci- 

 mens from any horizon. The matter could be finally resolved only by the definite 

 selection of one of Goldfuss's figured specimens as lectotype of P. cingulatus, if the 

 specimens can be traced and their horizons are determinable. The name cingulatus 

 is, however, now adopted in the sense advocated by Staesche, according to whom 

 the species to which it is applied ranges throughout the White Jura in Germany. 

 The Oxford Clay specimen figured by Phillips, holotype of Pecten phillipsii Thurmann, 

 belonged to a species which is certainly distinct although not readily identified. 



Family PECTINIDAE Rafinesque 1815 



Genus EOPECTEN Douville 1897 



Eopecten aubryi (Douville) 

 PL 6, figs. 3, 4 



1886. Pleuronectites aubryi Douville : 228, pi. 12, fig. 3. 



1929. Velata inaequi striata (Futterer) ; Weir : 25, pi. 1, fig 24 only, (non Futterer sp.). 



