730 MESSES. E. HEEON-ALLEN AND A. EAELAND ON THE 



Family NUMMULINID/E. 



Subfamily Poltstomellin^. 

 NONIONINA d'Orbigny. 



441. Nonionina depressula (Walker & Jacob). 



Nautilus depressulus Walker & Jacob. 1798, AEM. p. 641, pi. xiv. fig. 33. 

 Nonionina granosa d'Orbigny, 1846, FFV. p. 110, pi. v. figs. 19, 20. 



„ depressula Bradj', 1884, FC. p. 725, pi. cix. figs. 6, 7 (References). 



Egger, 1893, FG. p. 427, pi. xix. figs. 88, 39. 

 „ „ Millett, 1898, etc., FM. 1904, p. 599 (References). 



„ Cushman, 1910, etc., FNP. 1914, p. 23, pi. xvii. fig. 3. 



14 Stations. 



Generally distributed and usually fairly abundant. Two distinct types occur, one a 

 typical N. depressula characterized by fine perforations, the other a variety which may 

 be referred to the N. granosa of d'Orbigny, which is characterized by its turgid 

 chambers, coarse perforations, and secondary deposit of shell-substance in the form of 

 beads round the umbilical depression. The two forms occur in company at nearly all 

 Stns. and usually in about equal proportions, but at Stn. 11 typical N. depressula 

 only was observed. At Stn. "? A only A^ar. granosa. At Stn. % B typical N. depressula 

 was common, and var. granosa was rare. The best specimens of both forms were 

 observed at Stn. 4. 



442. Uoiiionina asterizans (Fichtel & Moll). 



Nautilus asterizans Fichtel & Moll, 1798, TM. p. 37, pi. iii. figs. e-h. 



Nonionina asterizans Parker & Jones, 1859, etc., NF. 1860, p. 101. no. 1. 



Polystomella crispa, var. (Nonionina) asterizans Parker & Jones, 1865, NAAF. p. 403, pi. xiv. 



fig. 35, pi. xvii. fig. 54. 

 Nonionina asterizans Brady, 1884, FC. p. 728, pi. cix. figs. 1, 2. 



Heron-Allen & Earland, 1913, CI. p. 143, pi. xiii. figs. 12, 13. 



11 Stations. * 



Generally distributed, but never abundant, the specimens usually small and weakly 

 developed, the best and largest being at Stn. ? X. We have discussed this somewhat 

 unsatisfactory type at some length in our Clare Island Monograph [ut supra), and 

 quite agree with Brady's remarks on the species in the Synopsis (B. 1887, SBRF. 

 p. 924). 



443. Honionina umbilicatula (Montagu). 



Nautilus umbilicatulus Montagu, 1803, TB. p. 191 ; Suppl. p. 78, pi. xviii. fig. 1. 

 Nonionina umbilicata Terquem, 1882, FEP. ]). 42, pi. ii. (x.) fig. 7. 

 „ umbilicatula Brady, 1884, FC. p. 726, pi. cix. figs. 8, 9. 



Egger, 1893, FG. p. 426, pi. xix. figs. 36, 37. 

 „ „ Millett, 1898, etc., FM. 1904, p. 600 (References). 



Chapman, 1900, FLF. p. 202. 



