•206 '-TERRA NOVA" EXPEDITION. 



542. Discorbinu bicoiicava, Parker and Jones. 



Disroihina hiconcam. Carpenter. Parker and Jones. 1862, ISF. p. 201, fig. 32(/. 

 Brady, 188 1, FC. p. 6.53. pi. xci, fig.s. 2, 3. 



Stations 2-6. 



Very rare and far from typical. Fossils at Stations 3 and 6. 



543. Discorhina wilsoni. sp. nov. Pi. VIT, figs. 17-19. 



Stations 23, 38. 48. 



Test free, oval in outline, highly convex on the superior, flat on the inferior 

 surface, but slojiing inwards to the umbilical apertural opening. Consisting of 

 about two convolutions of chambers, rapidly increasing in size, slightly swollen, 

 separated by limbate sutures rising into sharp ridges, and forming a sharp narrow 

 edge to the shell. Sm'face of the chambers between the sutm'al ridges rough, with 

 beads, forming in some mstances transverse costae. Colour opaque dull yellowish- 

 white on the superior side, clear and glassy on the inferior, where the sutural lines are 

 obscvu'e. Aperture, a depression on the inferior face of the terminal chamber, 

 bordered by radiatmg lines, leading down to a depression furnished with the 

 normal discorbine tooth. 



Diniensions : — Length. •32--37 nnu. : breadth. •27--32 mm.; heiu;ht, -13 mm. 



A few specimens only at each Station. Thoy have considerable resemblance 

 as regards the superior face to Brady's D. ventricosa (B., 1884, FC. p. 654, 

 pi. xci, fig. 7), but differ entirely from that species in the character of the under- 

 side, and of their decoration. Karrer's Pulvinidina erinacea (Karrer, 1868, 

 MFKB. p. 187, pi. V. fig. 6), which is an isomorph of D. ventricosa, has also 

 a certain resemblance to our species, which mav j^robably be regarded as an 

 isomorph of P. lateralis. 



544. Discorhina pulvinoides, Cushman. 



DIscorbis jndviitoide.s. Cushniau, 1910, etc., FNP. IDl.j, p. 2.'5, pi. vi, fig. 3. 



Stations 1, 2, 6. 27. 



We attribute om- specimens to Cushman"s species, but with some reservation. 

 His figure is unsatisfactory as it shows no edge-view ; he appears to have founded 

 the .species upon a single specimen, and does not refer to the peculiar secondary 

 chambers which are indicated in our specmieus, especially in the large and 

 typical example from Station 6. These secondary chambers clearly indicate the 

 close relationship of our specimens to D. linr/ulata. 



545. Discorhina limjukita, Burrows and Holland. 



Discorhina limiilala, Burrow.s and Holland in .1. P. & B., 1860, etc., MFC, 1896, p. 297, pi. vii, 

 figs. 33. n-c. 



Stations 1, 2, 8, 11. 



