FOKAMINIFEKA OF NORTH PACIFIC OCEAN. 



79 



TURRITELLELLA SHONEANA (Siddall). 



Trochammina shoneana Siddall, Proc. Chester Soc. Nat. Sci., pt. 2, 1878, p. 46, 



figs. 1, 2. 

 Ammodiscus shoncanus Siddall and H. B. Brady, Cat. Brit. Rec. Foram., 1879, 



p. 5. — Balkwill and Wright, Proc. Roy. Irish Acad., vol. 3, 1882, p. 546; 



Journ. Micr. and Nat. Sci., vol. 3, 1884, p. 25, pi. 1, fig. 4.— H. B. Brady, 



Rep. Voy.- Challenger, Zoology, vol. 9, 1884, p. 335, pi. 38, figs. 17-19. 

 Tiaritcllopsis shoncanus Rhumbler, Nachr. kon. Ges. Wiss. Gottingen, 1895, 



p. 84; Zeitschr. allg. Phys., vol. 2, 1902, p. 284, fig. 103. 

 TurritcUdla shoneana Rhumbler, Arch. Protistk., vol. 3, 1903, p. 2S3, text fig. 135. 



Description. — Test free, composed of a proloculum and long undi- 

 vided tubular second chamber, in a close coiled, elongate spiral, of- 

 nearly uniform diameter, wall finely arenaceous, with much cement, 

 rounded open end of the tubular 

 chamber serving as the aperture, 

 color reddish-brown. 



Length 0.25-0.5 mm. 



Distribution.— The only North 

 Pacific record for this species is the 

 deepest of the Challenger dredg- 

 ings, station 238, 3,950 fathoms, 

 east of Japan. In other parts of 

 the world this species has been 

 found in rather shallow water. 



Family 3. LITUOLID.E. 

 Test composed of agglutinated 



107 



108 



109 



material for the most part: consist- *""»■ io7-io9.-tukeitellella shoneana. x ioo 



* (after Brady). 



ing of two or more chambers; ar- 

 ranged in a linear, coiled or irregular series; apertures usually one to 

 each chamber, but sometimes more. 



The tests included in this family all have the wall composed of 

 agglutinated material with a varying amount of cement in the various 

 genera. Throughout the family as here used the tests are composed 

 of two or more chambers and a definite proloculum is apparent. 

 Usually the tests are composed of a series of chambers. There are 

 well marked genera in the coiled group which in their later growth 

 show a decided uncoiling and this may be carried to an extreme in 

 such forms as Ammobaculites agglutinans where only the early portion 

 shows any trace of coiling. 



Several new genera have been made to include species which are 

 very different in their plan of growth. The genera Ilaplophragmium 

 and Trochammina especially have been divided. According to the 

 type-species of Haplophragmium the test is uncoiled in later develop- 

 ment, closely coiled when young, more or less labyrinthic in the 



