^02 E. PENARD OX SOME RHIZOPODS FROM SIERRA LEONE. 



The shell (fig. 5a), about 128 /x in length, whilst showing the 

 ordinary pyriform appearance, is relatively very narrow, tapering 

 into a very long, straight neck, which abruptly terminates in 

 an orifice bordered by a thin, transparent, somewhat curved rim 

 or lip (Fig. 5c). This appearance of a lip-like border, which 

 ould be seen on all the specimens, is quite peculiar to itself and 

 has never been observed in any variety of D. i^yriforinis. 



The test itself is thin, chitinous with cemented flat grains mud 

 particles and somewhat compressed, so that a transverse section, 

 through the middle of the test, would figure as an ellipse, the 

 small a;iis of which would measure about three-fourths of the 

 long one. 



Fig. 55 shows the test as seen from the side. 



Difflugia lingula sp. no v. (PL 10, Fig. 6). 



This Rhizopod also reminds one at first sight of some varieties 



of D. 2)]p'iforrtiis, and one might easily be tempted to refer it to 



the figures 14, 15, 16, pi. xii, of Leidy's great work ; but it 



is much larger, more compressed, smoother, and shows a peculiar 



appearance which points to a distinct species. 



Seen from the broader side (Fig. 6ct), the test, 220 to 240 /a in 

 length and about 170 /x broad, and covered with fiat siliceous 

 particles, has a cordiform or linguiform appearance. It is regu- 

 larly rounded on its sides, and from a little behind its middle 

 it tapers rapidly to an abrupt, relatively narrow, circular (not 

 compressed) orifice. Posteriorly, the shell is terminated by a 

 sort of keel or apex, which is very often eccentrical, being 

 displaced left or right ; very rarely there is no appearance of 

 an apex, and the two sides simply meet each other abruptly, 

 forming an angle. 



The test is much flattened, and from above shows an elongated 

 elliptical contour, the length of the ellipse being about double 

 its breadth (Fig. Qc, where the circular mouth is seen in the 

 middle). In Fig. 6^ the shell is seen laterally. 



This species was rare in the collection ; about twenty specimens, 

 however, were found. All the tests were empty, or only con- 

 tained some dried, decayed yellowish matter, all that was left of 

 the plasma. 



