Nomenclature of the Foraminifera. 101 



general use, unless they are in duplicate, or otherwise quite 

 unnecessary ; but that these, and as many more as it may be 

 requisite to propose, must be used in descriptions and compari- 

 sons their really slight zoological value being always kept in 

 mind. 



1. Nautilus asterizans. Page 37, pi. 3. figs. e-h. " Recent : 

 Zoophytic concretions *, Mediterranean." This is a Nonionina, 

 small, many-chambered, and Nautiloid ; it has a slight umbili- 

 cus, around which an exogenous growth of shell-matter radiates 

 along the concave septal lines to about one-half their length. 

 It inhabits sandy shores and estuaries, and is common, in its 

 many varieties, both in the fossil and the recent state. This is one 

 of the typical forms of Nonionina (which, after all, are but low 

 forms of Polystomella). It exhibits the chief features which are 

 seen in different degrees of development in other related forms. 

 Its astral limbation is a feature which is much exaggerated in 

 N. limba, D'Orb. (Modeles, No. 11), and curiously modified with 

 flaps in N. stellifera, D'Orb. (Foram. Canaries, pi. 3. figs. 1, 2). 

 The figure in Soldani's ' Testaceograph.' referred to by Fichtel 

 and Moll with some doubt, as equivalent to N. asterizans, is 

 clearly not related. 



2. Nautilus incrassatus. Page 38, pi. 4. figs. a-c. " Recent : 

 Portoferrajo, Isle of Elba, Mediterranean." An umbonate va- 

 riety of Nonionina asterizans ; it has deeply sulcate septal lines, 

 and is more rounded at its periphery than the foregoing, from 

 which also it generally differs in having a closer texture with 

 finer pores. Many of the forms of Nonionince which have re- 

 ceived specific appellations exhibit considerable variableness in 

 the size of the perforations of their shells. N. incrassata, F. & M., 

 and N. Scapha, F. & M., have usually the finest, N. granosa, 

 D'Orb. and N. perforata, D'Orb., the coarsest pores. 



N. incrassata lives, with other varieties of N. asterizans, in the 

 shallow waters of the Mediterranean; it occurs fossil at Grignon, 

 and is the same as N. Icevis, D'Orb. (Modeles, No. 42), fossil 

 from Bordeaux. The umbo, in some of the astral forms, is 

 represented by granules, as in N. tuberculata, D'Orb. (For. Foss. 

 Vien. pi. 5. figs. 13, 14). 



A small delicate variety of N. asterizans (from Cuxhaven), 

 intermediate between N. depressula and N. crassula of Walker, 

 is accurately figured, with the colours of nature, by Prof. Ehren- 

 berg, in the ( Abhandl. Akad. Berlin, 1839' (1841), pi. 2, figs. 

 1 a-\ g. It is here termed " N. Germanica." 



* In the shelly deposits of the Mediterranean, and at the base of coral- 

 reefs, we find such concreted masses of broken shells, Bryozoa, Nullipores, 

 &c., as are here doubtlessly referred to. 



