18G0.] JONES AND PABXXB — POB8H I ttBl M imkkka. -J.";:; 



and is identical also with B. elegans, lyOrb. (Ann. So. Nat. vol vii, 

 p. 276. no.54)andSoldani(App. Test. 01 Bagg. Orit.]pl. 2. Bgs. q. a). 



The next most numerous group comprises the well-known forms 

 which haw been distinguished by the designations Nodosaria, Den- 

 taUna, MtxrginxiUna, VaginuUna, Planularia, Frondicularia, Ftabel* 

 lina, and OristeUaria | Pis. XIX. & XX. Bgs. 1-43). These are the 

 chief members of the great Nodosarine genus. 



The genus that is next in numerical force is Nubeeula/ria | PI. XX. 

 \\'s-. 18-56), ;i genus thai has not yet been well worked out. Besides 

 the varieties comprehended onderthe name of N. hu-iftu/n by I)e- 

 france (Diet. Si. X'at., Zool. pL 44. fig. 3), we have here several 

 long jointed forms, such as occur under certain conditions in company 

 with tortuous and Bcale-like varieties in the mud of the Indian and 

 other seas. 



Polymorphina (PL XX. fig. 44), BuUmina (fig. I"'). and Idtuola 

 (fig. 17) arc represented in this clay by a few individuals of very 

 familiar varieties, such as occur plentifully both recent and fossil. 



JNodosarina (genus).- — Individuals belonging to the subgenus Nb- 

 dosaria occur fossil at Chellaston in a very simple state of growth ; 

 and others presenl us with numerous Btagea of development, bo that 

 we have two-celled, three-celled, four-, live-, and more-chambered 

 individuals; straight and curved; Bmooth and ribbed; circular in 

 !i, oval, and compressed : of straight growth and oblique, with 

 central and with lateral aperture. Indeed we can recognize ami 

 the many varieties, shell-, corresponding to those which have been 

 named Nodosaria (Gflandulbna) Qlans (PL JQX. fig. 7), N.Radieula 

 (figs. 1 -">). S. JwumUs (fig. 6), .V. Badmen8ia(6gB.8,9),J!{.Raphamu 

 (fig, 10), and y. tineolata (figs. II. L2). 



Amongst those with mure or less oblique chambers, we recognize 



/;, tUalina Jm vis( 1*1. X IX. figs. 23,24), V. pauper ata (fig. 22), D.com- 



munis (figs. 25, -''<). Vaginutina Legumcn (figs. 27, 28), V. strigillata 



. 29 35 ). V. Dunkeri (fig. 36), and Planularia reticulata (ti,u r . 38). 



The compressed form of Nodosaria humitis, constituting a Lingulina 



(figS. L3-15), U abundant here, ai it IS also in the hia-. 88 WC know 

 from our own collections, and from BoiUi inann's •• bia-- Formation 



von GKfttingen." The form we refer to is the Lingulina oarinata 

 (D'Orb.), both smooth and striated. The gradations be t w e en these 

 Linguline forms and Frondicularia are striking and abundant hen', 



in both smooth and striated shells, The Froudieulariau variety 



found here is chiefly the /■'. ttriatula of Reuse (figs. I •; 18), together 

 with a variety of P. oomp2anola of Defranoe (fig, L9), Thegradations 

 from Frondicularia to Flabellina, with a more or b as spiral arrange- 

 ment of the older part of the shell, are remarkable, ami produce 

 Flabellina rugosa, D'Orb. (1 it. Tin' ohevron-cham I 



Nodosarina are subject to much irregularity rth as n 



the Latendextensionof the chambers; nor are the DenUdina exempt 

 from similar distortion ofgrowth. 



It is impossible to mark tie- exact boundarios which limit the 

 VaginulincB, Planul I I this fauna. Minute 



flattened individuals of OristeUaria t ,41) are link' 



