Nomenclature of the Foraminifera. 105 



and occasionally strongly spinous varieties^ has a peculiar and 

 interesting parallelism with Rotalia Beccarii. 



9. Nautilus strigilatus (two varieties). Page 49, var. a. pi. 5, 

 figs, c-e; var. /3. pi. 5. figs./, g. ''Recent: Poville, nearNovi, 

 Austrian shore of the Adriatic." Var. « is a somewhat flattened 

 P. crispa, with a small umbo, which, however, is relatively larger 

 than in the foregoing varieties. Var. /9 is a rowelled condition 

 of the same, and is the P. aculeata, D'Orb. (For. Foss. Vien. 

 ))1. 6. figs. 27, 28). Both are common shallow-water forms. 

 Fichtel and Moll refer correctly to Soldani, Testaceogr. vol. i. 

 p. 54, pi. 34. fig. I, for this form. 



10. Nautilus crispus. Page 40, pi. 4. figs. d-f. " Recent : 

 Adriatic. Fossil : Etruria." The references to Plancus and Sol- 

 dani for figures of this species are correct : Plancus, Conch, 

 p. 10, pi. 1. fig. 2 ; Soldani, Sagg. Orit. p. 100, pi. 2. fig. 17 y z ; 

 Testaceogr. vol. i. p. 54, pi. 33. fig. F, and pi. 34. figs. G, H. 

 This is the typical Pobjstomella crispa, Linnseus, being an inter- 

 mediate state of development between that of the thin, flat, de- 

 pauperated P. macella and the very thick, largely umbonate, 

 and frequently gigantic P. craticulata. It is of world-wide dis- 

 tribution, and occurs fossil in the Tertiaries. Its relationship 

 to Nonionina is alluded to at pages 101 & 103. 



11. Nautilus craticulatus. Page 51, pi. 5. figs. h-k. '^ Recent ; 

 Red Sea. From sea-sand in large shells : given by Spengler." 



This is the form of Polystomella which attains a very large 

 size among the coral-reefs of Fiji, Red Sea, Australia, and New 

 Zealand, also at the Canaries and the Philippines. In the figure 

 referred to the umbo is drawn large, but frequently we have met 

 with massive individuals, from the Australian reefs, having this 

 central exogenous growth extending over nearly the whole of 

 the shell, small patches only of the septal structure appearing 

 here and there towards the margin. Indeed, this masking of 

 the suiiace has been erroneously regarded by some as charac^ 

 teristic of a specific difi'erence. Not only in this large Polysto- 

 mellous species, but in many specific grou])s of Foraminifers, 

 superficial shelly matter may either be wanting or be developed 

 to any extent, without proving essential distinctness. 



It occurs fossil in the Miocene Tertiary beds of San Domingo. 



12. Nautilus radiatus. Page 58, pi. 8. figs. a-d. " Recent ; 

 Red Sea." In sea-sand from the interior of shells in Spengler's 

 collection. 



This is a small, smooth, lenticular Xummulina, about 1 line 

 in diameter ; maiked with twenty-four i-adiating, translucent, 

 septal lines, slightly sinuous, with an open sigmoid fiexure, 

 which extends from the periphery to the umbonal centre, and as 

 many intermediate short parallel septal lines towards the peri=. 



Ann. &; May. N. Hist. Ser. 3. Vol. v, 8 



