36 BULLETIN 104, UNITED STATES NATIONAL MUSEUM. 



Genus TROCHAMMINOIDES Cushman, 1910. 



Trochmmninoidcs Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 97. (Type, 

 Trochammina proteus Karrer.) 



Descrijdion. — Test free, typically planospiral, coinposed of several 

 coils, each constrioted into a num})er of cham])or-like portions with 

 the openings between large; wall of fine sand and a yellowish -l)rown 

 cement; a]iorture simple at the end of the last-formed chaml)er, 



Tiiis sjiecies frequently shows a tendency to continue the Ammodis- 

 cus condition through one or more of the early coils, and the later 

 portion only may be divided, or in other specimens the divisions may 

 occur much earlier. By its early development the genus seems to 

 have been derived from an Ammodiscus condition, as its earlier 

 development consists of a proloculum and long coiled chamber as in 

 Ammodiscus, but its later constricted condition foreshadows the 

 condition of complete division seen in the chambered coiled forms 

 usually assigned to Haplophragmiu'tn and Trochammina. 



TROCHAMMINOIDES PROTEUS (Karrer). 



Plate 8, fig. 7. 



Trochammina proteus Karrer, Sitz. Akad. Wiss. Wien, vol. 52 (Abtli. 1), 1865 

 (1866), p. 494, pi., fig. 8 (not 1-7).— H. B. Brady, Rep. Voy. Challenger, 

 Zoology, vol. 9, 1884, p. 341, pi. 40, figa. 1-3. — Haeusler, Neues Jahrb., 

 Beil, vol. 4, 1885, p. 28, pi. 3, fig. 24 (25-27?).— Egger, Abh. Bay. Akad. 

 Wigs. Munchen, vol. 18, 1893, p. 266, pi. 5, figs. 7, 8 (?).— Goes, Bull. Mus. 

 Comp. Zool., vol. 29, 1896, p. 33. — Eimer and Fickert, Zeitschr. Wisa. 

 Zool., vol. 65, 1899, p. 694, fig. 42 (in text).— Flint, Rep. U. S. Nat. Mus., 

 1897 (1899), p. 281, pi. 25, fig. 3.— Bagg, Proc. U. S. Nat. Mus., vol. 34, 1908, 

 p. 128. 



Trochammmoides proteus Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 98, 

 fi^gs. 142-144. 



Ammodiscus proteus Rhumbler, Arch. Prot., vol. 3, 1903, p. 281, fig. 131 (in text). 



Descriftion. — Test free, typically planospiral, composed of several 

 coils, the earlier ones usually unconstricted and undivided, the later 

 ones divided into several chambers with corresponding constrictions 

 of the wall ; material of the wall fine sand and a yellowish or reddish- 

 brown cement, fairly smooth; chambers of unequal length; aperture 

 large with the border thickened. 



Diameter, 1-1 ..t mm. 



Distribution. — From the records this is a widely distributed but 

 not common species. The Challenger specimens are from off the 

 Canaries, 1,125 fathoms (2,057 meters); two stations off Culebra 

 Island, West Indies, 390 and 450 fathoms (713 and 823 meters) ; 

 and off Brazil, G75 fathoms (1,234 meters). Goes had it from the 

 Caribbean and Fhnt from both the Caribbean and Gulf of Mexico. 

 I have had it in the Alhaiross material from off Nova Seotia, in 

 the Gulf of Mexico, off Yucatan, and irom the Caribbean. 



