114 



BULLETIN 71, UNITED STATES NATIONAL MUSEUM. 



Description. — Test of two distinct parts, an early close-coiled por- 

 tion and a long tubular uncoiled later portion; wall arenaceous, with 

 an excess of cement, either indistinctly or irregularly divided. 



This genus seems related, on the one hand, to Ammodiscus through 

 such a form as Trochamminoides proteus (Karrer), but shows a definite 

 senescent character in its uncoiled form. Besides certain fossil 

 species this genus includes the following recent species: 



LITUOTUBA LITUIFORMIS (H. B. Brady). 



Trochammina lituiformis H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, 

 p. 59, pi.. 5, fig. 16; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 342, pi. 40, 



figs. 4-7.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 281, pi. 20, fig. 1.— Bagg, Proc.U.S. 

 Nat. Mus., vol. 34, 1908, p. 128. 

 Lituotuba lituiformis Rhumbler, Nachr. kon. Ges. 

 Wiss. Gottingen, 1895, p. 84. 

 Description. — Test composed of a close- 

 coiled earl} 7 portion and a later uncoiled por- 

 tion, straight and tubular; irregularly or in- 

 distinctly divided into chambers; wall aren- 

 aceous with an excess of cement, aperture 

 at the end of the tubular portion; color yel- 

 lowish-brown. 



Length up to 3.7 mm. 

 Distribution. — Bagg records a single speci- 

 men of this species from Albatross station 

 D4000 in 104-213 fathoms near the Ha- 

 waiian Islands. Single specimens have oc- 

 curred at two Nero stations, 1330 in 1,543 

 fathoms, and 1439 in 1,901 fathoms, in the western North Pacific, 

 north of Guam. 



This species appears to be rare in the North Pacific, but three speci- 

 mens having been obtained from the dredgings. 



Genus AMMOBACULITES, new genus. 



Spirolina (part) d'Orbigny, Foram. Foss. Vierme, 1846, p. 137. 

 Haplophragmium (part) H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1S84, 

 p. 301. 



Description. — Test free, chambered, early portion close coiled in 

 one plane, later portion uncoiled and made up of a more or less linear 

 series of chambers; wall coarsely arenaceous, fairly thick; aperture 

 single at the center of the terminal face of the uncoiled portion, but 

 in the coiled portion at the base of the apertural face. 



This genus is more like the typical Haplopliragmium described by 

 Reuss, but although it is uncoiled in later growth it does not have the 

 multiple apertures or the interior structure of that genus. It is evi- 

 dently derived from the genus Ilaplophragmoides and its early devel- 

 opment is similar to that genus. The true Haplopliragmium is repre- 

 sented in the recent ocean by few species which have the multiple 



Fig. 175. 



-Lituotuba lituiformis. 

 X 50. 



