NO. 4 CUSHMAN AND MCCULLOCH : SOME VIRGULININAE 221 



Genus LOXOSTOMA Ehrenberg, 1854 



Loxostoma convallarium (Millett) 



Plate 27, Figs. 13, 14 



Bolivina convallaria Millett, Journ. Roy. Micr. Soc, 1900, p. 544, 

 pi. 4, figs. 6a, b. — Heron-Allen and Earland, Trans. Zool. Soc. London, 

 vol. 20, 1915, p. 647. 



Loxostoma convallarium Cushman, Special Publ. 9, Cushman Lab. 

 Foram. Res., 1937, p. 191, pi. 22, figs. 11-13. 



Test very elongate, slender, about 4 times as long as broad, periphery 

 serrate in front view, rounded in end view ; chambers distinct, inflated, as 

 high as broad throughout, early ones smooth except for a spine at the 

 peripheral angle, later ones veiy deeply excavated on the lower side and 

 crenulate at the border, tending to become somewhat imiserial in the 

 adult; sutures distinct, depressed, very strongly so in the adult, oblique; 

 wall of early portion smooth, later portion smooth except for the crenu- 

 late border; aperture elongate, oval, with a distinct lip, tending to become 

 terminal. 



The records for this species are from the Malay Archipelago and 

 from the Kerimba Archipelago ofiF the east coast of Africa. Our specimens 

 have a tendency to be slightly more spinose than the types and in this 

 respect resemble somewhat Bifarina elongata Millett. 



Station: 616. 



Distribution. — The material from which these specimens were ob- 

 tained was collected at low tide on West Nole Island, Whitsunday Pas- 

 sage, east coast of Australia, by Miss Archie McLean, while visiting the 

 Great Barrier Reef in Australia. 



Loxostoma instabile Cushman and McCulloch, new species 

 Plate 27, Figs. 15-17; Plate 28, Figs. 1-7 



Test elongate, slender, especially in the earlier stages and in the micro- 

 spheric form, cylindrical in the young, later becoming much compressed, 

 periphery in the adult acute and keeled ; chambers distinct, in the micro- 

 spheric form very gradually increasing in size as added in the early por- 

 tion, later becoming rapidly larger and inflated in the median portion, 

 compressed and keeled at the periphery, the posterior angles extending 

 backward into distinct spines, later chambers becoming irregularly uni- 

 serial; sutures distinct, in the later portion depressed, more strongly 

 curved ; wall mostly smooth, rather coarsely perforate, the perforations 



