FORAMINIFEEA OF THE KEEIMBA ARCHIPELAGO. 667 



2 Stations. 



At Stns. 1 and 3, especially at Stn. 1, a considerable number of specimens were 

 found, of a very distinctive form, which we assign to Wright's variety. The tests 

 are characterized by the practically parallel surfaces of the shell, the central portion 

 being only slightly convex. The test is strongly built but very hyaline in the centres, 

 with thick milky-white borders, contrasting strongly with the clear central portion. 

 The centre of this clear portion, which, in the typical var. walleriana is furnished 

 with a solid stud of shell-substance, is, in the Kerimba specimens, thickened and 

 marked by one or more irregularly shaped spots of opalescent shell-matter, which 

 may coalesce so as to form a pair of brackets (), a horseshoe, or an incomplete ring, 

 giving a very striking appearance to the organism. These opalescent markings are 

 somewhat depressed or eroded into the clear shell-wall. The whole test is much more 

 solidly constructed than in the normal examples of L. orhignyana, and tlie orifice is 

 situated at the extremity of a short thick pbialine neck. 



281. Lagena orbignyana, var. kerimbatica, nov. (Pi. L. figs. 38-40.) 



3 Stations. 



Test very compressed, oval, furnished with three keels, the two outer ones 

 extending to the same width as the median, the space between the outer keels and 

 the median divided into equal spaces by a number of divisional wails which project 

 beyond tlie edges and give a denticulate appearance to the margin of the test. About 

 fifteen to twenty of these denticulations are visible on each edge of the test, increasing 

 in length towards the aboral end. The marginal wall of the test is separated from 

 the carina by a channel ; the aperture is on a short produced neck. Surface of the 

 test somewhat rough. 



Our Kerimba specimens may be compared with Sidebottom's L. hicarinata, var. 

 imhricata (S. 1912, etc., LSP. 1912, p. 419, pi. xx. fig. 2), to which they bear a 

 striking superficial resemblance. They differ, however, in the fact that there are 

 three well-defined carinse instead of two as in L. hicarinata, var. imbricata, and in the 

 fact that the processes between the carinee, which in L. hicarinata, var. imhricata, 

 alternate and extend only to a point midway between the two keels, in the Kerimba 

 variety of L. orbignyana form a definite wall running from one side of the test to the 

 other, joining all three keels and separating the intracarinal space into definite oblong 

 spaces as shown in our figure. 



Length 0'30-0-34 mm., breadth 0T7 mm,, thickness (measured between outer 

 edges of marginal carinse) 0'06 mm. 



282. Lagena castrensis Schwager, 



Lagena castrensis Schwager, 1866, FKN. p. 208, pi. v. fig. 22. 

 Egger, 1893, FG. p. 333, pi- x. figs. 71, 72. 

 „ orbignyana, var. castrensis Millett, 1898, etc., FM. 1901, p. 626, pi. xiv. fig. 20. 



