480 Messrs. W. K. Parker and T. R. Jones on the 



modifications, which still retain their own peculiarities of struc- 

 ture, mode of growth, and ornamentation. 



(E.) Nautilus rugosus (1162. 277) is not safely determinable, 

 there being no figures to refer to, and the description being 

 applicable to several Foraminifers. It appears most like the 

 Planulina Ariminensis or the Operculina complanata. It is from 

 the South Sea. 



(F.) Nautilus umbilicatus (1163. 278) and N. Semilituus (1163. 

 280) are varieties of a species of Peneroplis, the type being the 

 Peneroplis planatus (D'Orb.), a passable figure of which is given 

 by Schroter in his 'Neue Litterat.' (1781), vol. i. pi. 1. fig. 7. 

 Another specimen figured on the same plate (fig. 9) is a narrower 

 form of P. Semilituus, the chambers being nearly cylindrical, and 

 the shell well representing a crozier {Lituus) ; the P. Semilituus 

 has its chambers flattened, so that the staff and head of the 

 " crozier" are no longer formed of a cylindi-ical body ; P. umbili- 

 catus is also flattened, and does not possess the straight portion 

 of the shell, being nautiloid, and representing only the head of 

 the crozier, flattened ; lastly, P. planatus has its latter chambers 

 widely flattened out, and resembles in outline a bonnet I'ather 

 than a crozier *. 



D'Orbigny^s Dendritina is also a true Peiieroplis, without the 

 straight portion, and not flattened. Some of the Spirolince of 

 authors are Peneroplides with stick-like crozier-forms (some, 

 however, belong to Lituola). 



[Nautilus Siphunculus (1164. 287) has nothing to do with 

 loraminifei-a, but probably belongs to the Serpmlce. Soldani 

 figures numerous specimens ("Tubuli armillati," &c.) varying 

 in details; 'Testae, ac Zooph.^ pi. 27.] 



(G.) Serpula Seminulum (1264. 791) is the Quinqueloculina 

 Seminulum, — a good type for the vastly numerous group of 

 quinqueloculine Miliolce, which occur in every sea. 



Gmelin's edition of the ' Systema Naturse' (1788) contains 

 seven names of Foraminifa'a in addition to those given by Lin- 

 naeus. These were determined on the evidences aSbrded by 

 figures and descriptions by Spengler, Schroter, and Gronovius. 



(H.) Rot alia {Calcarina) Spengleri is the Nautilus Spengleri 

 (Gmelin, 3371. 10). This shell has been well figured also by 

 Schroter (from the Adriatic), and by Fichtel and Moll (from the 

 Indian and Red Seas). Spengler's specimen (Danske Ski-ift. 

 N. S. vol. i. pi. 2. f. 9 a-c) was from Amboyna. 



Lamarck^s Siderolites calcit?-apoides (Anim. sans Verteb. vol. vii. 

 p. 624) is the same species, from Maestricht. 



* It has already been observed by Mr.Hanley (Ipsa Linn. Conch, p. 158) 

 that Montagu's N. Semilituus is not that of Linnaeus (after Plancus in 

 Fabius Colonna's ' Phytobasis '). 



