1 30 HALKYARD, Fossil Foraminifera of the Blue Marl 



bers with a stout acutely pointed spine attached to the terminal 

 edge of the successive chambers. The spine is perforated by 

 a median canal broad at the base where it communicates with 

 the interior of the chamber and tapering to a very minute tube 

 opening at the extremity of the spine. Umbilicus somewhat 

 depressed as also are the sutures, chambers slightly inflated. 

 The growth of the spines does not apparently begin until a com- 

 plete whorl of chambers has been formed. Aperture very 

 obscure, apparently typically nonionine. (All the specimens 

 except very immature ones are broken in the final chambers.) 

 The surface of the chambers finely perforate, somewhat rough. 

 Only the chambers of the final convolution visible. 



Breadth: .4 — 4.5 mm., Diameter: .25 — .35 mm. without 

 spines. Spines average .2 mm. in length, .075 mm. at base. 



322. Rotalia papii.losa, var. comprkssiuscula, Brady. 



Rotalia papulosa, var. compressiuscula, Brady, 1884, Chall. 

 Rep., vol. IX, p. 708, pi. CVII, fig. 1, a, b, c; pi. CVIII, 

 fig. 1, a, b, c. 



Very rare. My specimens resemble the latter drawing of 

 Brady's with the difference that the sutures 011 the inferior sur- 

 face are bent at an angle of about half their length, and do not 

 take the slightly curved direction from the centre to the peri- 

 phery of the test as shown in the above figures. 



(The specimens are far from typical.) 



FAMILY NUMMULINIDJE. 



SUB-FAMILY POLYSTOMELLIN/E. 



Genus Nonionina, d'Orbigny. 



323. Nonionina depressula, (Walker & Jacob.) 



Nautilus depressulus, Walker & Jacob, 1798. Adam's Essays, 

 Kannmacher's Ed., p. 641, pi. XIV, fig. 33. 



Nonionina depressula, Brady, 1884, Chall. Rep. vol. IX p. 725, 

 pi. CIX, figs. 6-7. 



Rare. The specimens are also of a weak form. The shell 

 is very thin, and the chambers are much inflated and few in 

 number, only about six making up the last whorl. The umbili- 

 cus of the test is depressed and partially filled up with granular 

 shell-matter. 



