650 MESSES. E. HEEON-ALLEN AlsD A. EAELAND ON THE 



MiMOSINA Millett. 



229. Mimosina rimosa, sp. n. (PL L. figs. 5-11.) 

 10 Stations. 



Test free, hyaline, consisting of three. to five pairs of chambers arranged in a regular 

 biserial order. The initial portion of the test is sometimes triserial. The chambers 

 somewhat inflated, giving slightly depressed sutural lines. Shell-wall coarsely per- 

 forate, in the usual mimosine manner; surface of the test smooth and glassy, usually 

 very transparent. Aperture mimosine or double, but abnormal, consisting of a long 

 fissure extending all round the lower half of each chamber midway between the two 

 faces of the test and forming a compressed funnel which opens into the internal cavity 

 of the chamber. In the fissure, and near the point of junction of the last two 

 chambers, is a small secondary opening into the chamber which is not connected with 

 the funnel. 



This well-marked form is one of the most distinctive of the Kerimba types, occurring 

 at nearly every Stn.. often moderately plentiful. It may be regarded as closely allied 

 to M. hystrix Millett, from which, hovs^ever, it differs in many points, notably in the 

 invariable absence of all spinous processes and in its very distinctive aperture. 



Breadth '18 mm., length "o mm., thickness T mm. 



230. Mimosina affinis Millett. 



Mimosina affinis Millett, 1898, etc., FM. 1900, p. 548, pi, iv. fig. 11. 



15 Stations. 



Universally distributed, often very common. This is one of the typical species of 

 the Kerimba dredgings, and is extremely true to type ; hardly any variation has been 

 observed except at Stn. 8, where a few of the specimens had the apical edge of the 

 chambers ornamented with short spines like Bulimina marginata, and at Stn. 12 

 where a few specimens had a single short stout apical spine. 



There do not appear to be any published records of this species except Millett's 

 original one from the Malay Archipelago, " occurring in great profusion at nearly all 

 the Stations," and its discovery in equal abundance at Kerimba on the other side of 

 the Indian Ocean, in common with so many other distinctly Malayan types, is certainly 

 of the greatest zoological interest. 



We have met with a few minute but typical specimens in a dredging from Vavau 

 in the Friendly Islands (S. Pacific, 16 fms.), and it would therefore appear to be widely 

 distributed across the Indo-Pacific area. 



231. Mimosina spinnlosa Millett. 



Mimosma spiuulosa Millett, 1898, etc., FM. 1900, p. 518, pi. iv. figs. 12, 13. 



16 Stations. 



Universally distributed, sometimes very common, but, on the wliole, less typical of 



