282 Frederick Chapinan : 



This interesting little form, doubtfully pelagic, is moderately 

 common in washings from the Lepidocycliiia rock of the Filter 

 Quarries. It has been recorded from the Balcombian of Muddy 

 Creek by Mr. Howchin. 



Fam. ROTALIIDAE. 



Spirillina ci. inaequalis, Brady. 



S. inaequalis, Brady, 1884, Rep. Chall. vol. IX., p. 631, pi. 

 LXXXV. Figs. 8-11. 

 A single example was found in the rock from the Filter Quar- 

 ries. It is concave on one face, and slightly convex on the 

 other. The periphery is rounded rather than flat, as in Brady's 

 figured examples. Otherwise it agrees in general characters with 

 the above species. Howchin found S. inaequalis in the Bal- 

 combian of Muddy Creek. As a living form it seems confined 

 to the southern hemisphere, in the region round Australia and 

 the S. Pacific. 



Discorhina orbicularis, Terquem sp. 



Eosalina orbicularis, Terquem, 1876, Anim, sur la Plage de 

 Dunkerque,, p. 75, pi. IX. Figs, ia, b. Discorbina 

 orbicularis, Terq. sp. Egger, 1893, Abhand, k. bayer, 

 Akad. Wiss., CI. II., vol. XVIII., p. 389, pi. XV. Figs. 

 16-18, 76-78. 



An example of this little shallow- water form was found in the 

 Lepidocyclina rock of the Filter Quarries. It is more convex 

 on the superior face than usual. D. orbicularis is a well-known 

 species in Miocene and Pliocene strata, and has also occurred in 

 beds as old as the Lower Cretaceous in England. Howchin re- 

 cords it from the Balcombian of Muddy Creek. 



Discorbina pileolus, d'Orbigny sp. 



Valiulina pileolus, d'Orbigny, 1839, Foram. Amer. Merid., p. 

 47, pi. I., Figs. 15-17. Discorbina pileolus, d'Orb. sp., 

 Brady, 1884, Rep. ChalL, vol. IX.,. p. 649, pi. LXXXIX., 

 Figs. 2-4. 



