482 Messrs. W. K. Parker and T. Rupert Jones on Foraminifera. 



Schroter's figure (Neue Litterat. vol. iii. p. 283, pi. 3. figs. 22, 

 23), an attached specimen (with the lower side of the chambers 

 imperfect) of that form of Lituola which we termed Placopsilina 

 in our memoir on some Foraminifera from Norway [op. cit. 

 p. 29) . It was found affixed to the " Madrepora prolifera '' from 

 the coast of Norway. 



Lituola nautiloides is one of an immense group of varieties, of 

 which the type is Lituola nautiloidea, Lamarck. These are found 

 in every sea, and very frequently in the fossil state ; they occur 

 both fixed and free. 



(M.) Nautilus helicites (3371.6), figured by Schroter (Vollstan- 

 dige Einleitung, &c. vol. iv. (1784) pp. 368 & 377, pi. 10. fig. 2), 

 is possibly an Amphistegina. It is from the Chalk of Maestricht. 



(N.) Nautilus Beccarii /3. ammonoides (Gmelin,3370. 4; Gronov. 

 Zoophyl. 1781, p. 282, and Tabularum Explic.p.v.pl. 19. figs. 5, 6) 

 and iV. Balthicus (Gmelin, 3370. 5 ; Schroter, Naturforscher, 1 782, 

 vol. xvii. p. 120; and 'Einleitung Conch.' vol. i. p. 20) are refer- 

 able to the Foraminifer usually known as Operculina complanata, 

 Basterot, sp., which is the best form of this variety, and attains 

 a large size at the Philippine Isles and New Zealand, and occurs 

 also in the Mediterranean and Atlantic, and abundantly in some 

 of the tertiary strata. Gronovius's specimens were in sea-sand 

 from Bengal ; Schroter's from the Baltic, attached to the root of 

 a Fucus. Operculina is a subgeneric form of Nummulina. 



Tabular List of the Foraminifera enumerated by Linne and Gmelin. 

 Linnaean Names. Typical Species and Subspecies. 



Nautilus Calcar, L Cristellaria Calcar . . . 



obliquus, L Nodosaria (Dentalina) 



Raphanistrum, L. . Nodosaria 



Raphanus, L Nodosaria 



Fascia, L Nodosaria 



Granura, L Nodosaria ........ 



Radicula, L Nodosaria 



Legumen, L Vaginulina (Dentahna) J 



crispus, L Polystomella crispa. 



Beccarii, L Rotalia Beccarii. 



rugosus, L [?Planulina Ariminensis vel Operculina com- 

 planata ?] 



umbilicatus, L. . . Peneroplis 1 t» i x 



Semilituus, L Peneroplis / ^' Pl^natus. 



Serpula Seminulum, L. Miliola (Quinqueloculina) Seminulum. 

 Nautilus Spengleri, Gm. Rotalia (Calcarina) Spengleri. 



unguiculatus, Gm. Polystomella crispa. 



Lituus, Gm Peneroplis planatus. 



insequalis, Gm Vertebralina (Articulina) striata. 



Serpula nautiloides, Schr. Lituola (Placopsilina) nautiloidea. 

 Nautilus helicites, Schr. [? Amphistegina vel Operculina?] 



]5cccarii /3. ammonoides, Gm. "I 



ammonoides, Gron I Nummuhna (Operculina) complanata. 



Balthicus, Schr J 



N. Raphanus ^ 



