102 Messrs. W. K. Parker and T. R. Jones on the 



3. Nautilus pompilioides. Page 31, pi. 2. figs. a-c. " Recent : 

 zoophytic concretions, Mediterranean. Fossil : Coroncina, Tus- 

 cany." A small, coinmon, Nautiloid Nonionina. Subglobose, 

 with Hush cells, which are not so numerous as in N. asterizans, 

 umbilicate, smooth, intermediate as to the size of its perforations 

 between N. mcrassata and N'. granosa. This is one of the sub- 

 globose varieties of a subspecies, the peculiar features of which 

 are best represented by Nonionina asterizans. The N. umbilicata 

 of D^Orbigny's 'Modeles' (No. 86) and xV. Soldanii, B'Ovh. 

 (Foram. Foss. Vienne, pi. 5. figs. 15, 16), are closely related va- 

 rieties. The N. crassula, Walker, N. depressuh, Walker, and 

 N. umbilicata of Montagu (not Walker), are also nearly allied, 

 but they are thinner, and have the septal joints more deeply 

 sunken. N. tuberculuta, N. perforata, N. granosa, N. punctata, 

 N. communis, and N. Boueana (D'Orb. For. Foss. Vien. pi. 5) 

 are forms akin to N. Soldanii, and present varietal conditions 

 of outline, of ornament, and of foramina within the limits of 

 specific latitude. 



N. pompilioides is very common fossil in the Subapennine 

 clays, and recent in deep water (especially at from 100 to 500 

 fathoms) in the Mediterranean and other seas. 



N. pompilioides bears the same relation to A^. asterizans that 

 Rotalia Soldanii does to R. Beccarii, being a thick form with 

 flush cells, which in shallow water become more outspread with 

 gibbous chambers. 



The following references to Soldani's figures by Fichtel and 

 ]\Ioll, for this species, are correct : Soldani, Sagg. Oritt. p. ] 00, 

 pi. 2. fig. 16 / /, T T, V V, X X. ; Testaceogr. vol. i. p. 59, pi. 46. 

 fig. q q. 



4. Nautilus Scapha. Page 105, pi. 19. figs. d-f. "Recent : 

 Adriatic Sea." This is an oblong variety of Nonionina asterizans, 

 rapidly increasing in the size of its chambers. It is the Nonio- 

 nina communis, D'Orb. (For. Foss. Vien. pi. 5. figs. 7, 8). This 

 variety is of common occurrence in all seas, and also in the 

 Tertiary deposits. 



5. Nautilus Faba*. Page 103, pi. 19. figs. a-c. "Recent : 

 sand from Rimini and other parts of the Adriatic and Medi- 

 terranean. Fossil : Sienna, Volterra, and near S. Quirico." 

 This is an interesting variety, showing the first trace of passage 

 between Nonionina and Polystomella, — further links of union 

 being supplied by the next-mentioned variety (P. striatopunc- 

 tata), of which this may be said to be an oblong form. The 

 aperture is here crossed with little bars ; and the septal lines 

 also are bridged over in some specimens ; both of which features 



* This form is not related to the figures referred to in the works of 

 Soldani and Plancus. 



