NOTBS ON RBTICULARIAN RHIZOPODA. 37 



genus Proteonina} The Rev. A. M. Norman, in his in- 

 teresting paper on Haliphysema and forms apparently allied 

 to it^ has thrown much light on the group to which the 

 " Porcupine" species probably belongs, and discarding the 

 supposed affinity to the so-called Proteonina, which is a 

 feeble Lituoline form of the Haplophragmiuni series, has 

 given it the new generic name, Marsipella. In this course 

 T entirely concur. 



As the occurrence of Marsipella elongata, Norman, is 

 pretty much confined to areas in the Atlantic, further north 

 than any point in the line of the " Challenger" cruise, its 

 history need not be dwelt upon here, but a form which 

 appears more nearly allied to it than to any other described 

 type is occasionally met with in southern latitudes. This I 

 propose to call Mai'sipella granulosa. It agrees with M. 

 elongata in its fusiform contour, and in having an aperture 

 at each extremity of the test, and these perhaps may be 

 regarded as the essential characters of the genus. On the 

 other hand, the test is composed entirely of fine sand, and it 

 is much less compactly built than that of M. elongata, the 

 walls being thick in the middle and thinning away towards 

 the ends. A specimen, laid open, is shown in PI. Ill, fig. 9, 

 but portions of the slender extremities have crumbled away in 

 the process of grinding. Figure 8, of the same plate, repre- 

 sents a nearly perfect individual. The material selected for 

 the construction of the test, in the absence of sponge spicules, 

 is an even-grained, light-coloured, very fine sand, and as the 

 amount of cement (whatever it may be) secreted by the animal 

 is very small, the requisite solidity appears to be attained by 

 the thickening of the walls, and this takes place to such an 

 extent that the central cavity is little more than a tube of 

 nearly even diameter. The interior is smooth and stained 

 reddish brown to a greater or less degree, and the same 

 colouration is also apparent externally at the extremities of 

 the test around the orifices. 



The best specimens of Marsipella granulosa have been 

 found in a dredging off the Azores, at a depth of 1000 

 fathoms. 



Ge«w5— RHABDAMMINA, M. Sars. 

 Rhabdammina linearis, n. sp. PI. Ill, figs. 10, 11, 

 Characters. — Test free, linear ; straight or curved ; con- 



1 Carpenter, 'The Microscope/ fifth ed., 1875, p. 533, fig. 273, 

 d. e./.— Willliamson, ' Rec. For. Gt. Br.,' p. 1, pi. 1. figs. 1—3. 



2 ' Annals and Mag. Nat. Hist.,' ser. 5, vol. i, p. 281, pi. 16, fig. 7, 



