Manchester Memoirs, Vol. Ixii. (1917) 9 



9. Spiroloculina crenata, Karrer. 



Spiroloculina crenata, Karrer, 1868, Sitz, k. Ak. Wiss. Wien., 



LVIII, Abth. 1, p. 135, pi. 1, fig - . 9. 

 vS. crenata, Brady, 1884, Chall. Rep. p. 156, pi. X, figs. 24-26. 



Very rare, only one small specimen being found. 



(The specimen is very small and not very typical. It shows 



a broad milioline aperture and is perhaps nearer to Quinque- 



loculina plicatula, Reuss, which Karrer referred to as being 

 "very like" his species.) 



10. [Spiroloculina dorsata, Reuss.] 



[Spiroloculina dorsata, Reuss, 1870, Sitz. k. Ak. Wiss. Wien, 

 vol. LXII, Abth. I, p. 97, pi. XXXVII, figs. 24-32.] 



ioa. Spiroloculina limbata, Bornemann. 



Spiroloculina limbata, Bornemann, 1855, Zeitschr. deutsch. 



geol. Ges., vol. VII, p. 348, pi. XIX, fig. 1. 

 S. limbata, Reuss, 1863, Sitz. k. Ak. Wiss. Wien, vol. XLVIII 



Abth. I, p. 64, pi. VIII, figs. 89, a, c. 



The specimens which I have thought necessary to assign 

 to Bornemann's species are rare in my collections and closely 

 resemble the figures given by Reuss; there are also some 

 others (two or three) which are broader, and have not the same 

 excessive sutural limbation, and conform more to the "canali- 

 culata" type. These might be named S. dorsata, Reuss, but 

 as the few specimens found are a good deal decomposed and 

 worn it is not desirable to record that species definitely, though 

 they very probably do belong to it. In making use of Borne- 

 mann's name as the authority for the specific appellation 

 "limbata," I do not forget that d'Orbigny in 1826 made use 

 of the same name, but it was not applied to the same form and 

 is more applicable to the variety of S. canaliculata assigned by 

 Reuss to 6\ dorsata, viz : — that with chambers having slightly 

 limbate sutures or excavate lateral surfaces, and a square or 

 very slightly rounded periphery. This mode of regarding these 

 nearly allied forms will, I think, be found a convenient one, 

 as the strongly limbate form above described may be regarded 

 as an elongated 6\ dorsata which has put on an extra amount 

 of sutural limbation, or as a 6". impressa which has added a 

 limbation to the already salient peripheral edges of its cham- 

 bers. Moreover the reference of any specimens to the exact 

 form figured by Reuss leaves no doubt as to the variety which 

 is now recorded as occurring in the Biarritz marls. 



