558 MESSES. E. HEE()]S^-ALLEN AND A. EAELAND ON THE 



the species with M. suhrotunda. Biloculine, tviloculine, and quinqueloculine specimens 

 occur. As Millett has pointed out [ut siqjra), the biloculine form is the Biloculhia 

 ventruosa of Eeuss (R. 1887, FSW. p. 69, pi. i. fig. 9), whilst the quinqueloculine 

 form is hardly distinguishable from Af. subrotunda (Montagu). He also identifies the 

 species with Triloculina eno^lostoma, var. grammostomum Reuss {op. cit. p. 72, pi. ii. 

 fig. 5). 



25. Miliolina circularis, var. sublineata Brady. (Pi. XLI. figs. 9-11.) 



MilioUna circularis, var. sublineata Brady, 1884, FC. p. 169, pi. iv. fig. 7. 



„ „ „ Millett, 1898, etc., MFM. 1898, p. 501, pi. xi. fig. 4. 



Egger, 1893, FG. p. 237, pi. ii. figs. 78, 79. 

 „ „ „ Heron-AUcu & Earland, 1913, CI. p. 28. 



10 Stations. 



Generally distributed and often very abundant, especially a large thick-shelled type 

 with coarse sulci, not always extending over the whole shell, recalling M. seminuda 

 (Reuss). Specimens with cribrate apertures were found at Stns. 6, 10, and 1 A, all 

 belonging to a small thin-shelled type closely resembling Millett's figure {ut supra) 

 except in their small size as compared with the normal specimens. Millett states 

 that his cribrate specimens considerably exceeded in size the specimens of 21. circularis 

 with which they were associated. 



26. Miliolina circularis, var. cribrostoma, nov. (Pi. XLI. figs. 12-16.) 



3 Stations. 



At three Stns. specimens of a Miliolid of the circularis type, but having a large and 

 projecting cribrate aperture, were found. They are all of a very inflated triloculine 

 type, and the cribrate shell-mass closing the aperture forms an inflated cushion 

 projecting from the top of the shell and extending down the sutural lines on both 

 faces of the test as far as the point of intersection of the chambers. Millett 

 figures a somewhat similar but more regular type of aperture as M. circularis, var. 

 sublineata (M. 1898, etc., FM. 1898, p. 501, pi. xi. fig. 4). 



Cribrate apertures are of rare occurrence in the recent Miliolinse, but of more 

 frequent occurrence in fossil species. Munier-Chalmas and Schlumberger have dealt 

 at some length with the fossil forms (Bull. Soc. Geol. France, 1885 and 1905). They 

 attribute a structural importance to this character of aperture which does not appear 

 to be borne out by more general research. It seems probable that the cribrate 

 aperture may be assumed at times by many species which do not invariably present 

 it {vide sub No. 25). Among species characterised by this pronounced form of 

 aperture are Q. fabularoides Karrer and Miliolina alveoliniformis Brady. Compare 

 also Massilina alveoliniformis Millett {post No. 90). 



The length and breadth of the specimens are about equal, averaging •3-'4 mm. 



