340 Messrs. W. K. Parker and T. E,. Jones on the 



rare," according to Walker. We may here remark that we 

 retain " Vaginulina" as a subgeneric term, in preference to 

 " Dentalina," used by Professor Williamson, because Vaginulina 

 is the most perfect mean between the two extremes Nodosaria and 

 Cristellaria ; whereas Dentalina is as intimately connected with 

 Nodosaria on the one hand, as Marginulina is with Cristellaria 

 on the other. At the same time, we must repeat that there is 

 no real divisional line existing between any of these forms. 



(J.) Fig. 89, described by Walker and Jacob (p. 25) as 

 "Echinus subrotundus planus lobatus. The colour opaque 

 white. From Reculver; rare," is manifestly (from its minute 

 size, faintly drawn spire, and peculiarly placed aperture) a com- 

 mon variety of Globigerina bulloides, D'Orb., which is found on 

 our shores. Walker's fig. 89 has not been previously recognized 

 (we believe) as representing a Foraminifer. 



The opposite Table shows the species and varieties figured by 

 Walker. 



The Foraminifer a figured and described in Montagu's ' Test. Brit.' 

 and ' Supplement.' 



Subsequent to Walker's work on the minute shells of the 

 Kentish coast, little was done in England in the natural history 

 of the Foraminifera until Colonel G. Montagu produced his 

 ' Testacea Britannica*,' in 1803, and the ' Supplement-)-' in 1808. 

 Walker's species, however, had received names in Kanmacher's 

 second edition of G.Adams's 'Essays on the Microscope' (1798) ; 

 and John Adams and other naturalists had noticed a few of the 

 more common littoral species. 



On the Continent several fossil forms, chiefly Nummulites, 

 had been during this time noticed and figured by Tozzetti, Faujas, 

 Fortis, and others ; and Soldani had produced his gigantic Mo- 

 nograph on the fossil and recent Foraminifera and other minute 

 shells of Tuscany. With the same date as that of the 'Test. 

 Brit.', there was published at Vienna a handsome volume devoted 

 to Foraminifera — the ' Testacea Microscopica/ &c, by Fichtel 

 and Moll, containing good figures and careful descriptions. 

 This work we hope to analyze in our next communication. 



Professor Williamson has the following useful remarks on 

 these works in the Introduction to his Monograph (p. vi.) : — 



" The appearance of Montagu's ' Testacea Britannica' in 1803, 

 and the ' Supplement' in 1808, marked a new era in the study 



* Testacea Britannica; or, British Shells. Parts I. & II. 4to, Romsey 

 and London, 1803. In the ' Bibliograph. Zool. et Geol.,' published by the 

 Ray Society, the date of this work is misprinted " 1803-1808." 



f Supplement to the Testacea Britannica, with additional plates. 4to, 

 Exeter and London, 1808. 



