286 Messrs. W. K. Parker and T. Rupert Jones on some 



like O. granulosa, sometimes strongly ribbed like O. canalifera, 

 and sometimes approaching the smoothness of 0. ammonea and 

 O. coinplayiata^ ; there being indeed apparently no essential 

 specific difference between our minute specimens, the broad re- 

 cent forms of the Philippines, &c., and the large fossil varieties 

 above mentioned from France, Italy, Varna, and India, 



The little Operculina under notice occurs abundantly in some 

 localities of the North British coasts (Shetland, Skye, &c.). It 

 is one of the most common forms in the Norway dredgings. 



Planulina Arhninensis, D'Orb., is evidently referable to this 

 species, the model No. 49 exactly representing our specimens. 

 Some slight differences, however, may be recognized between 

 D'Orbigny's figures and both his model and our shells, especially 

 in the aperture, which is rather excentric in his figure. 



8. Nonionina crassula, Montagu, sp. PI. XL figs. 5, 6. 



Nautilus, Walkert, Test. Min. pi. 3. f. 69 & 70. 



Nautilus umbilicatulus and N. crassulus, Montagu, Test. Brit. vol. i. p. 190 ; 



iii. p. 7B. pi. 18. f. 1, 2, and perhaps N. depressulvs, ib. f. 9. 

 Nautilus incrassatus, Ficht. & Moll, p. 38. pi. 4. fig. a, b, c. 

 Nonionina incrassata, D'Orb. Ann. des Sc. Nat. vii. p. 293. no. 6. 

 Nonionina crassula, D'Orb. ib. p. 294. no. 7- 



Shell hyaline, discoidal, nautiloid, somewhat depressed, edge 

 rounded; chambers from about eight to sixteen in the outer 

 whorl, triangular in side-view and faintly curved, more or less 

 overlapping the upper and lower surfaces of the former whorls ; 

 septa somewhat excavated, especially between the later chambers; 

 umbilicus deep, but sometimes filled up. Aperture varying from 



* The beautiful Foraminifer from Malta figured and noticed in the An- 

 nals Nat. Hist. 2 ser. vol. xv. p. 275. pi. 7- f- 4, as " Lenticulites compla- 

 natus," is the Heterostegina depressa, D'Orb. 



t Mr. Walker's figures, like many of the old illustrations of the Fora- 

 minifera, are of little aid in the recognition of specific forms. Still, as 

 monuments of the labours of earlier naturalists, they necessarily command 

 respect ; and, whenever possible, they are regarded as points of reference 

 for known species. Col. Montagu refigurcd the Sandwich specimens, and 

 added others (chiefly from drawings supjjlied by Mr. Boys). Walker's 

 figures and descriptions would certainly be of veiy little value to us without 

 Montagu's subsequent remarks and illustrations. But even in these later 

 and far superior engravings, much is wanting in the definition of import- 

 ant characters in these minute shells. Mr. Walker should not be quoted as 

 the authority for the specific appellations chosen by Montagu for the 

 Sandwich and other Foraminifera, certainly first figiu-ed and diagnosed by 

 Walker, but left imnamed by him in accordance with his avowed intention 

 of not giving his new specimens trivial (Linna;an) names. 



We take this opportunity of stating that some of the Foraminifera collected 

 by Boys and Walker at Sandwich, Sheppey, &c., and figured by Walker 

 and Montagu, are undoubtedly fossil sjjccimens washed from the cliflFs : 

 particularly figs. ^G & 73, Walker ; and pi. 14. figs. 4, 5, & pi. 19. figs. 1,2, 

 3, 5, Montagu. 



