220 ■ "TERRA NOVA" EXPEDITION. 



6, where it is coinmon, almost equally good at Stations 8 and 12. In the N.Z. 

 area, especially at Stations 2, 3 and 6, a variety occurs in which the involution 

 of the earlier whorls is carried to such an extent that the final chamber overlaps 

 and gives a nonionine appearance to the test. Fossils of the type occur at 

 Stations 2, 3 and 0. 



601. Rotalin soklann, var. arenacea, nov. PI. VII. figs. 29-31. 



At Station 28 a specimen, which we figure, built up of fine sand-grains with 

 ferruginous cement. The aperture is large and gaping. Surface-texture neat and 

 smooth, but without excess of cement. Its nearest ally, in the Lituolidae, would 

 probaltly be Haplophragmium (/lomeratum, with which it agrees in the number 

 and method of arrangement of chambers, but differs in the dissimilarity of the 

 axial extremities, one being drawn out as in H. glomeratmi). the other being flattened 

 and depressed as in the rotalian type. Brady, in his descrijition of H. glomera- 

 tum, appears to have met wth similar specimens, as he refers to asymmetrical 

 specimens, having one end broader than the other, and with excavated umbilici. 



We have similar specimens from Annam. 



Size: — Breadth, •40mm.; lieight, -30 mm. 



602. Rotalia papillosa, var. compressiuscula, Brady. 



Rotalia papillosa. var. compressiitsctda, Brady, 1881, FC. p. 708, pi. cvii, fig. 1 ; pi. cviii, 



fig. 1. 

 „ ■ „ Cushman, 1910, ftc, FNP. 1915. p. TO, |,l. XXX, fi.s. 1. 



Station 2. 



A fe'w fossil specimens. 



603. Rotalia craiiculata, Parker and Jones. 



RoUdia cmtirnhita, Parknr and .Tones, 1865, NAAF, pp. 387, 422, pi. xix. fig. 12. 



Station 6. 



A few specimens, mostly fossil, which are referable to this species, which, 

 judging from its markings and their occurrence at the Station where R. dathrata 

 reaches its maximum development, is probably a pauperate form of that species. 



604. Rotalia dathrata, Brady. 



RoUdia clalhmln, Brady, 1884, FC. p. 709. pi cvii, figs. 8, 9. 



Jones and Chapman, 1900, MCI. p'. 2.32, pi. xx, fig. 2. 



Stations 2-8, 10, 11. 



Common in the N.Z. area and reaching its maximum development and varia- 

 tion at Station 6. The species varies enormously in the relative convexity of the 

 two faces, and the degree of strength of the costae traversing the walls of the 

 chambers. In its most compressed form the superior face is absolutely flat and 

 the inferior but slightly convex. Such specimens are only separable externafly 



