POllAMINIFEEA OF THE KEEIMBA AECHIPELAGO. 583 



network, but they never result in deep pits such as are seen in Miliolina reticulata. 

 M. secans, as known to European Khizopodists, is singularly noi'mal in the character 

 of its shell-surface, even striate varieties being very rare, but in the Malay Archipelago, 

 according to Millett, the species appears to be subject to great superficial varia- 

 tions, ranging from smooth to papillate. The papillate form figured by him, which 

 strongly suggests our var. reticulata, except that the ornamentacion is raised instead of 

 being depressed, proves on examination of the types, which are now in our collection, 

 to be distinctive, and nearer to M. macilenta. 



Almost universally distributed, and most abundant at Stns. 1, 5, 6, 9, and 13, the 

 best specimens being at Stn. 9, The individuals are, as a rule, very compressed, but 

 some are of normal thickness. The Kerimba specimens are all toothless, a feature 

 which appears from Millett's drawing to be also characteristic of his Malay specimens. 



Length averages •75-"95 mm., breadth •62--92 mm., thickness •! mm. 



88. Massilina secans, var. rugosa, nov. (PL XLV. figs. 5-12.) 



6 Stations. 



The construction of the test is as in the type, but the entire surface is covered with 

 a firmly agglutinated layer of very fine sand-particles and mud, embedded in the 

 superficial layer of the calcareous test. This adventitious layer does not penetrate 

 the test to any appreciable depth, and can be scraped off" with a needle-point, revealing 

 the normal white test underneath. The sand-grains project very slightly, owing to the 

 small size of the particles habitually used. The colour varies at diff'erent Stns., 

 probably owing to the percentage and nature of the incorporated mud, ranging from 

 a very light grey to a dusky or even brown tint. 



This form, although not universally distributed, is quite one of the characteristic 

 Miliolids of the Kerimba gatherings, and is usually a predominant type at the Stns. 

 where it occurs, attaining a very large size. At Stn. 12 there is a tendency in the 

 large specimens to become wild-growing, the final chamber being thrown off at 

 abnormal angles from the axis. Two distinct forms occur in company at nearly every 

 Stn. — one roughly triangular in section, the other much more complanate. These no 

 doubt correspond with the forms b and a of Schlumberger's M. secans (S. 1893, MGM. 

 p. 77), as demonstrated by him in his sections of the type. 



Size very variable — average length l'O-2-O mm., breadth ■8-l"5 mm. 



89. Massilina macilenta (Brady). (Pi. XLV. figs. 13, 14.) 



Miliolina macilenta Brady, 1884, FC. p. 167, pi. vii. figs. 5, 6. 



Massilina secans, var. macilenta Millett^ 1898, etc., FM. 1898, p. 609, pi. xiii. fig. 4. 



2 Stations. 



Extremely rare, the records depending upon a few individuals, none very strongly 

 costate. 



VOL. xs.— PAKT XVII. No. 6. — November, 1915. 4 o 



