230 MESSES. BRADY, PARKER, AND JOKES ON 



119. Nonionina exponens, n. sp. (Plate XLIII. fig. 16.) 



Characters. Test free, equilateral, planospiral; lateral faces convex or somewhat 

 flattened, peripheral edge rounded ; composed of from two to three convolutions, all 

 more or less visible on both sides of the shell, the final whorl consisting of about seven 

 or eight segments ; margin entire ; septa marked by fine lines, without superficial 

 depressions. Diameter t ^q inch (025 millim.). 



A form somewhat allied to If. depressula, but differing from that species in its 

 evolute mode of growth, its even sutures, and non-inflated segments. Obtained from 

 the sounding at Station I, ; 940 fathoms. 



120. Nonionina umbilicatula, Montagu, sp. (Plate XLIII. fig. 19.) 

 Nonionina umbilicatula, Chall. Report, p. 726, pi. 109. figs. 8, 9. 



Specimens of average dimensions, at four stations. 



121. Nonionina scapha, Fichtel & Moll. (Plate XLIII. fig. 20.) 



Nonionina scapha, Chall. Report, p. 730, pi. 109. figs. 14-16. 



A very few examples at Stations IV. and VIII. , of small size, and too thin to be 

 quite typical. 



Poltstomella, Lamarck. 



122. Poltstomella stkiatopunctata, Fichtel & Moll, sp. (Plate XLIII. fig. 17.) 

 Polystomella striatopunctata, Chall. Report, p. 733, pi. 109. figs. 22, 23. 



Not uncommon in the forty-fathom sounding. 



123. Poltstomella, sp. 1 (Plate XLIII. fig. 18.) 



A single worn and doubtful specimen, from 47 fathoms, of which it is not easy to say 

 whether it is a true Polystomella or an overgrown Nonionina. 



Subfamily NuMMULiTiKA 



Amphistegina, d'Orbigny. 



124. Amphistegina lessonii, d'Orbigny. (Plate XLIII. fig. 15.) 

 Amphistegina lessonii, Chall. Report, p. 740, pi. 111. figs. 1-7. 



Small specimens, tolerably common in the deepest and the shallowest soundings, but 

 not observed in any of the others. 



