449 



44. Coscinodiscus centralis, Ehr. 



45. „ iiitidus, n. sp. 



46. „ umbonatus, n. sp. 



47. „ punctulatus, n. sp. 



48. „ concavua, Ehr. 



49. Melosira ? n. sp. 



50. Eupodisciu subtilis, Ralfs. 



51. Campylodiscus Ralfsii, Sm. 



52. „ centralis, n. isp. 



53. „ angularis, n. sp. 



54. „ ezimius, n. sp. 



55. „ limbatus, Breb. 



It will be seen, that two of these forms have been described by 

 Ehrenberg, who figures them in the fossil deposits above alluded to, 

 and one by De Brebison, who found it near Cherbourg. The form 

 to which Mr Ralfs's name is attached was supposed by him to be 

 Coscinodiscus concinnus, Sm., but proves to be a very remarkable Eu- 

 podiscus. I had not seen it when Mr Ralfs first observed it ; but 

 since then, Dr Greville observed it on one of my slides, and I have 

 myself repeatedly noticed it since. I give a figure of it, as it has 

 not yet been figured. Campylodiscus Ralfsii I figure, because it 

 occurs in these dredgings, twice or thrice the size of Professor 

 Smith's figure, from which, moreover, it differs in several points ; 

 but I believe it to be the same species. The remaining forms are 

 new and remarkable. That which I suppose to be a Melosira is 

 doubtful as to genus. 



Group V. 

 Amphiprora. 

 There are not many new species of this genus, but all of them are 

 remarkable. 



56. Amphiprora lepidoptera, n. sp. 

 •">7. „ obtusa, n. sp. 



58. „ pusilla, n. sp. 



59. „ elegans, Sm. 



60. Amphiprora plicata, n. sp. 



61. „ maxima, n. sp. 



62. „ ? complesa, n. sp. 



The first was described, and the F.V. figured in my last paper on 

 the Glenshira sand ; while the S.V. had been figured in my first 

 paper as Amphiprora vitrea (3. But as both figures were imperfect, 

 and the form not quite understood, I have now figured it again. 

 The remaining species, except No. 59, are all new and distinct, 

 and Amphiprora maxima is a splendid form. 



The last is a very remarkable form, which I doubtfully refer to 

 the same genus. Segments of it had occurred in the Glenshira sand, 

 but it was only in the Corallina gathering that I found the entire 

 form. I exhibit enlarged figures of Amphiprora maxima, and of 

 Amphiprora ? complexa, both the segments and the entire form. 



Gboup VI. 

 Amphor(e. 

 This group is by far the largest, containing upwards of thirty 



