On the Genus Botellina. 189 



together at various angles forming rude chamberlets which open out 

 into a main tube (or chamber), which runs through nearly the whole 

 test. 



Incomplete specimens only known. 



DEFINITION OF NEW SPECIES. 

 Botellina pinnata, sp. nov. 



Test free, erect, arenaceous, comparatively smooth externally, 

 tubular, in the form of a slightly compressed or rounded robust 

 pinnate structure ; the pinnate outgrowths rounded and slightly 

 swollen, compressed or lobulated at their distal ends, with a series 

 of pseudopodial apertures at the apex, — these are covered with a 

 very fine, pale-coloured cement, from which (in the fresh state) 

 numerous delicate transparent spicules project irregularly. Size, 

 1 to 2-J inches (25 to 62 mm.) in height, with a diameter of -fa to 

 f inch (3*5 to 6 mm.) rising from a basal or primordial more or less 

 inflated chamber § to about \ inch broad (9 to 12 mm.) ; oval, 

 subglobular, subangular, or more or less compressed, from which 

 arises a short cone-shaped neck before becoming divided into 

 regular alternate pinnate outgrowths, which at times again divide 

 into radiating branches or offshoots, but always retaining the 

 pinnate character. Walls thick, of very firm consistence, finely 

 cemented externally, and with minute chambers, which communicate 

 into a main tubular passage running through the whole structure 

 opening out freely, vestibular-like, into the pinnate outgrowths. 

 Colour in various shades of red and brown, or ferric-brown. 



The specimens on which the genus Botellina has been founded 

 differ from all other known Asteoehizid^e, not only on account of 

 its size, but in the general structure of its test, the walls of which 

 are chambered, and therefore represents one of the highest types of 

 structural development among the recent arenaceous Foraminifera. 



In Botellina pinnata we have a well-defined method of building 

 up the test ; the main body of the test is composed of coarse 

 materials. The walls are of firm consistence, j\ to -f^ of an inch 

 (35 to 10 - 5 mm.) in thickness, composed of siliceous grains, with a 

 mean diameter of 0*5 mm., made up chiefly of Quartz, Kir con, and 

 a sprinkling of Glauconitic particles, with an occasional Garnet or 

 two, the whole incorporated by a siliceous and ferruginous cement. 

 A thin layer on the exterior is more or less solid and imperforate, 

 giving the whole structure a smooth and solid appearance. The 



