FORAMi:r<:iFEBA OF THE PHILIPPINE AND ADJACENT SEAS. 373 



It has occurred at the following localities: Chhia Sea, off southern 

 Luzon; off Jolo Jolo; off Tawi Tawi; off Romblon; off eastern 

 Panay; between Burias and Luzon; Gulf of Davao; Verde Island 

 Passage; and Darvcl Bay, Borneo. 



Amphistegina lessonli, var. radiata. — Material examined. 



Genus OPERCULINA d'Orbigny, 1826. 



Nautilus (part) Gronovius, Zooph. Gron., 1781, p. 282. 



Lenticulites (part) Defrance, Diet. Sci. Nat., vol. 25, 1822, p. 453. 



Opcrculina d'Orbigny (Type, 0. complanata Defrance), Ann. Sci. Nat., vol. 7, 



1826, p. 281.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 



742. — Carpenter, Introd. Foram., 1862, p. 247. 



Carpenter has given a very detailed account of the structure of 

 this genus, and mentions especially its relations to Iletcrostegina, the 

 relations which are very clear in a series of Philippine specimens 

 studied. Among his material Carpenter had specimens from the 

 Philippine region, and his notes on these, after studying the Alba- 

 tross Pliilippine collection, are very interesting. There is, undoubt- 

 edly, much variation, as Carpenter mentions, but this seems to be 

 along definite lines, and from a study of the several thousand speci- 

 mens of available Philippine material the various forms seem to fall 

 into definite categories. 



In looking up the literature the first species to be described is 

 0. complamita Defrance. This species, which is known from 

 d'Orbigny 's figure,^" and from the Modeles, No. 80, is a definite many- 

 chambered, very flat, unornamented test, the coils rapidly increasing 



»o Ann. Sci. Nat., vol. 7, 182^, pi. 14, figs. 7-10. 



