896 



SYSTEMATIC HISTORY Or THE INFUSORIA. 



Australia. 1-84" ; nodules large ; costae 

 16 to 18 in 1-1200". 



N. gigas (E., K.). — Very large, elon- 

 gated ; broadl}^ linear, with gibbous centre, 

 and broadly rounded, slightly attenuated 

 ends ; costae broad, close, not reaching 

 the median line. KA. p. d>0.=Pinnidaria 

 gigas, EM. pi. 2. 3. f. 1. America. Akin 

 to N. nobilis; nine pinnules in 1-1200". 



N. major (K.). — Large, turgid, linear- 

 oblong, with slightly tumid centre and 

 broadly rounded ends ; costse converg- 

 ing at the centre, stout, 12 in 1-1200". 

 KB. p. 97, pi. 4. f. 19, 20. = Pimmlaria 

 major, SD. pi. 18. f. 161 ; Pimmlaria 

 viridis, E., in part. Common. (^t;i. 65 ; 

 XII. 15, 31; XYi. 1-6.) This species 

 scarcely differs from N, nobilis and JV. 

 gigas, except by its somewhat smaller 

 size and closer pinnules. 



N. acrosphceria (K.). — Elongated, 

 slender linear, with dilated centre and 

 ends, rounded apices, and seventeen short 

 thick costse in 1-1200", which do not 

 reach the median line. KB. p. 97, pi. 5. 

 f. 2. = Pimmlaria acrosphceria, RabD. 

 p^ 45, pi. 6. f 36 ; SD. pi. 19. f. 183. 

 Europe. Front view narrow-linear. 



^ . p)achi/p)tera (E., K.). — Large, bacil- 

 lar, but short and stout, with gibbous 

 centre and broadly rounded ends, which 

 are not constricted ; pinnules stout, not 

 reaching the median line, 6 in 1-1200". 

 KB. p. 98, pi. 28. f 58. = Pimmlaria 

 pachyptera, E. Labrador, Australia. 



N. hehes (Ralfs). — Small, oblong, with 

 gibbous centre and broadly obtuse ends ; 

 strise distinct, 33 in -001", nearly reach- 

 ing the median line.=iV! ohtusa, SD. i. 

 p. 50, pi. 16. f. 140. Britain. 



N. cocconeiformis (Greg.). — Small, 

 subelliptic, with tumid centre and slightly 

 contracted, broad, obtuse ends ; striae in- 

 distinct, median line straight, nodide 

 definite. MJ. iv. p. 6, pi. 1. f. 32; 

 Grey. ANH. 2nd series, xy. pi. 9. f. 6. 

 Scotland. It much resembles Acknanthi- 

 dium Jlexellum, but its median line is 

 quite straight, Greg. 



N. 3Iacida (G.). — Small, oblong, with 

 tumid middle, and very broad, subtrun- 

 cate ends ; striae very fine, parallel, nearly 

 reaching the median line, except opposite 

 the large, transverse, quadrate indefinite 

 median space. TM. iv, p. 43, pi. 5. £ 9. 

 Marine. Britain. Stri^ about 70 in 

 •001". In shape not unlike large speci- 

 mens oiAchnanthidium Jlexellum, but the 

 median line is straight. The central 

 nodule is obsolete and is replaced by the 

 large, stain-like blank space, Greg. 



N. gibba (E., K.). — Bacillar, striated. 



lanceolate, with dilated capitate ends. 

 KB. p. 98, pi. 28. f. 70. = Pimmlaria 

 gibba, EA. pi. 1. 2. f. 3; SD. pi. 19. f 

 180. Common. Europe, Asia, Africa, 

 America. Striae close, not reaching the 

 median line, 30 in -001". 



IS.Tabellaria (E., K.).— Bacillar, elon- 

 gated, striated, rather turgid, ventricose 

 at the middle, with dilated, broadly 

 rounded apices. KB. p. 98, pi. 28. f. 79. 

 = Pimiidaria Tahellaria, EA. pi. 2. 1. 

 f 26 ; SD. i. pi. 19. f. 181. Europe, Asia, 

 Africa, America, (xn. 21.) The central 

 dilatation tapers less than in N. gibba, 

 and the striae are more distant. It is 

 more slender than N. nobilis. 



N. por recta (E., K.). — Large, elon- 

 gate-lanceolate, broadly tumid at the 

 middle, and gradually tapering into the 

 broadly obtuse apices; striae oblique. 

 IlA. p. 81. = Pimmlaria porrecta, EA. 

 p. 133. North America. Akin to N. 

 decurrens. 



N. decurrens (E., K.). — Striated, nar- 

 row, elongate-lanceolate, tumid at the 

 centre, somewhat narrowing towards the 

 ends, which are broadly rounded. KA. 

 p. 81. = Pimmlaria decurrens, EM. many 

 figures. /3 slenderer, = P/wwi//ana Tra- 

 becula, E. y, striae obsolete, = Navicula 

 Trabecula, E. Ehrenberg gives upwards 

 of 80 habitats. Akin to N. gibba. 



N. Esox (E., K.). — Large, elongated, 

 striated, narrow-lanceolate, with slightly 

 gibbous centre and attenuated but obtuse 

 ends ; striae parallel, nearly reaching the 

 median line. KB. p. 94, pi. 28. f. 53. = 

 Pinmdaria Esox, EA. p. 133, pi. 1. 2. £ 4. 

 Chili, (xii. 43.) 



D. Valves with a sjnooth, transverse 

 ■middle fascia. 



N. cardinalis (E.). — Large, broadly 

 linear, with rounded ends ; costae stout, 

 radiant, 9 in -001", interrupted by a 

 smooth, transverse median band. =Pm- 

 nidaria cardinalis, SD. i. pi. 19. £ 166 ; 

 Stauroptera cardinalis, EM. several fi- 

 gures ; Stam'oneis cardinalis, KB. p. 106, 

 pi. 29. £ 10. Europe, Asia, Australia, 

 Africa, America, (xii. 72.) A well- 

 marked species, easily recognized by its 

 large size, rounded not attenuated ends, 

 and coarse striae, which are shorter near 

 the transverse median fascia. Perhaps 

 this and other species having a trans- 

 verse smooth median fascia might ad- 

 vantageously be retained in Stam-oneis, 

 notwithstanding that the fascia is not 

 formed by a thickened prolongation of 

 the central nodule. 



N. divergens (S.). — Large, oblong- 



