346 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



ROTALIA BROECKHIANA Karrer. 



Plate 72, figs. la-c. 



Rotalia broechhiana Karrer, in Drasche, Geol. Insel Luzon, 1878, p. 98, pi. 5, 

 fig. 26.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 705, 

 pi. 107, figs. 4a-c.— Ctjshman, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 68, pi. 27, 

 fig. 4; pi. 30, fig. 2, text figs. 61a-c. 



Although of wide distribution in the area this species is represented 

 at but 13 stations, and at most of these by very few specimens. The 

 specimens, however, are very typical, both in size and other specific 

 characters. 



The stations include the following localities : China Sea, off Formosa; 

 Verde Island Passage and Batangas Bay; Mindoro Strait; between 

 Siquijor and Bohol; east coast of Mindanao; off Jolo; Palawan Pas- 

 sage; and in the region to the south, off Bouro Island and Gulf of 

 Tomini, Celebes. 



In depth th^e stations range from 220 to 805 fathoms (403 to 

 1,472 meters), with the average depth 492 fathoms (901 meters). 

 Bottom temperatures range from 41.2° to 73.8° F. (5.1° to 23.2° C), 

 with the average 52.0° F. (11.1° C). 



Rotalia broechhiana — Material examined. 



ROTALIA ORBICULARIS d'Orbigny. 



Rotalia (Gyroidina) orbicularis d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 278, 



No. 1; ModMes, 1826, No. 13. 

 Rotalia orbicularis 11. B. Brady, Trans. Linn. Soc. London, vol. 24, 1864, p. 470, 



pi. 48, fig. 16; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 706, pi. 107, fig. 



5; pi. 115, fig. 6.— CusHMAN, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 68, pi. 



29, fig. 3; text figs. 62a-c. 



Typical specimens of this species seem to be rare. The fact that 

 later authors have departed more or less widely from the typical form 

 described by d'Orbigny has been noted by Heron- AUen and Earland.^* 

 At only two stations have specimens been found which have seemed 



2< Trans. Zool. Soc. London, vol. 20, pt. 17, 1915, p. 718. 



