120 BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



belong with the Rotalidae. If fossilized it would be difficult to dis- 

 tinguish such tests from truly arenaceous ones by superficial exami- 

 nation. 



Germs TROCHAMMINA Parker and Jones, I860. 



Nautilus (part) Montagu, Test. Brit., Suppl., 1808, p. 81. 



Rotalina (part) Williamson, Recent Foram. infera of Great Britain, 1858, p. 50. 

 Globigerina (part) Williamson, Recent Foram. infera of Great Britain, 1858, p. 56. 

 Trochammina (part) Parker and Jones, Quart. Journ. Geol. Soc, vol. 16, 



1860, p. 304. — W. B. Carpenter, Parker, and Jones, Intr. Study Foram., 



1862, p. 141.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 



337. — Eimer and Fickert, Zeitschr. wiss. Zool., vol. 65, 1899, p. 695. 



Type, T. inflata (Montagu) = Nautilus inflatus Montagu. 

 Lituola (part) Parker and Jones, Trans. Roy. Soc. London, vol. 155, 1865, p. 



407. 

 Haplophragmium (part) Siddall and H. B. Brady, Cat. Brit. Rec. Foram., 1879, 



p. 4.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 312. 

 Ammoglobigerina Eimer and Fickert, Zeitschr. wiss. Zool., vol. 65, 1899, p. 704. 



Description. — Test free or sometimes adherent, spiral, trochoid, 

 chambered; all chambers visible when viewed from above, only the 

 chambers of the last formed volution visible from below ; wall arena- 

 ceous usually with considerable cement; aperture an arched slit on 

 the ventral side of the chamber at its contact with the preceding 

 volution. 



As here considered, Trochammina is restricted to those species like 

 T. inflata or T. squamata, which have a true spiral, trochoid test with 

 all the chambers visible only from' above. 



TROCHAMMINA SQUAMATA Jones and Parker. 



Trochammina squamata Jones and Parker, Quart. Journ. Geol. Soc, vol. 16, 

 1860, p. 304. — W. B. Carpenter, Parker, and Jones, Intr. Study Foram., 

 1862, p. 141, pi. 11, fig. 1. — Parker and Jones, Trans. Roy. Soc. London, 

 1865, p. 407, pi. 15, figs. 30, 31 a-c— H. B. Brady, Ann. Mag. Nat. Hist., ser. 4, 

 vol. 6, 1870, p. 288, pi. 11, fig. 4; Quart. Journ. Micr. Sci., vol. 19, 1879, p. 

 56.— Haeusler, Neues Jahrb., 1883, pt. 1, p. 60, pi. 4, fig. 8.— H. B. Brady, 

 Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 337, pi. 41, figs. 3a-c— Haeus- 

 ler, Neues Jahrb., Beil., vol. 4, 1885, p. 29, pi. 3, fig. 30.— Balkwill and 

 Wright, Trans. Roy. Irish Acad., vol. 28, 1885, p. 331.— Haeusler, Abh. 

 schweiz. pal. Ges., vol. 17, 1890, p. 65, pi. 10, figs. 27-29, 40.— J. Wright, 

 Proc. Roy. Irish Acad., vol. 1, 1891, p. 469. — Egger, Abh. kon. bay. Akad. 

 Wiss. Miinchen, vol. 18, 1893, p. 264, pi. 5, figs. 4-6.— Eimer and Fickert, 

 Zeitschr. wiss. Zool., vol. 65, 1899, p. 695, fig. 43 (in text). — Millett, Journ. 

 Roy. Micr. Soc, 1899, p. 362.— Sidebottom, Mem. and Proc. Manchester 

 Lit. and Philos. Soc,' vol. 49, No. 5, 1905, p. 5. 



Trochammina proteus Karrer (part), Sitzb. kais. Akad. Wiss. Wien, vol. 52, 

 1865, p. 494, pi. 1, fig. 6 (not 1-5, 7, 8). 



Description. — Test free or sometimes adherent, trochoid spiral, 

 flattened, consisting of three to four volutions with four or five cham- 

 bers in each, convex above, flattened or somewhat concave below, 

 all chambers visible on the dorsal surface, onlv those of the last formed 



