910 



SYSTEMATIC HTSTOPvY OF THE I'N'FUSORIA. 



dilated. = Pinmdaria inj(im(Ba, EM. 

 pi. 10. 1. f. 9 ; MJ. iv." pi. 1. f. 8. 

 Europe. 



N. lepida (Grreg.). — Minute, hyaliue, 

 oval, or oblong, with obtuse ends ; striae 

 indistinct from tlieir transparency, 

 slightly radiant. MJ. iv. p. 7, pi. 1. 

 f. 25. Scotland. 



N. oceanica. — Elliptic-oblong, twice 

 as long as broad, with subacute apices, 

 small, round, cleaiiy-dciined umbilicus, 

 and double median line; margin deli- 

 cately but widely striated ; pinnules 20 

 in 1-1200". Southern Ocean. 1-570". 



K. Median line Jlexuose. 



N. tumicla (Breb.)- — Large, tumid, 

 striated, twisted, oblong, with obtuse 

 apices, a liexuose median line, and close, 

 fine strife, which reach the median line. 

 KA. p. 77. = iV. Jennerii, SD. i. p. 49, 

 pi. 16. f. 134. Marine. France, Britain. 

 (VII. 55.) Front view broad linear ob- 

 long, with rounded angles; frustules 

 t\vasted, so that the hyaline central por- 

 tion appears ilexuose. 



N. coni-exa (S.). — Large, tumid, stri- 

 ated, twisted, linear oblong, with conic 

 apices, a ilexuose median line, and 21 

 strife in -001", which do not quite reach 

 the median line. SD. i. p. 49, pi. 18. 

 f. 136. Marine. England. Front view 

 broadly linear-oblong, with rounded 

 angles, and a narrow, flexuose, longi- 

 tudinal median band. 



N. Westii (S.). — Broadly lanceolate, 

 with subacute apices, and 38 delicate 

 strise in -001", which nearly reach the 

 slightly flexuose median line. SD. i. 

 p. 49, pi. 16. f. 135. Marine. England. 

 Colour of dry valve dark purple; front 

 view linear, ^vith rounded angles, and a 

 narrow, slightly ilexuose median band. 



N. ? camjjylogramma (E.). — Small, 

 o\ate, obtuse, smooth, with a flexuose, 

 sigmoid median line, and orbicular cen- 

 tral nodide. EB. 1853, p. 36. Bavaria, 

 Rhine. Probably identical with Aehnan- 

 thidiumjlexellum, since Ehrenberg states 

 that he has seen it, together with Aeh- 

 nanthes ? Bavarica, distributed imder the 

 name of CymheUaJlexella. 



N. tortuosa (E.). — Smooth, crystalline, 

 rather turgid, and somewhat tortuous, 

 so that one end has a more obtuse apex. 

 EB. 1843, p. 271. 1-288". 



N. dissimilis (S.). — Frustules oblique ; 

 elliptic ; median line somewhat diagonal 

 from the obliquity of the frustule, re- 

 curved at extremities; striae obscure. 

 ANH. 1857, xix. p. 8, pi. 2. f. 6. Pyrenees. 



L. Frustules luncdehj curved in the 

 front vieiv. 



N. c/emiflexa (K.).— Parasitic, smooth, 

 narrow-lanceolate, obtuse; front view 

 linear, with truncate ends, Innately 

 em-ved. KB. p. 101, pi. 21. f. 6. Marine. 

 Peru. 



M. Frustules lunatehj curved in the 

 lateral view. 



N. Neapolitana (Bab.). — Luuately 

 curved, linear, with truncate ends, and 

 transverse striae. = Falcatella Neajwli- 

 tana, Rab D. p. 46, pi. 5. f. 3. Italy. 



N. lunata (K.). — Smooth, small. In- 

 nately cmTed, narrow-linear, with 

 slightly romided ends ; front view 

 linear, truncate. KB. p. 101, pi. 4. 

 f. 1. 4,. = Falcatella lunata, Rab D. p. 46. 

 Italy. 



]:^.Roma7ia (Rab.). — Smooth, attached 

 by a gelatinous base; Innately curved, 

 linear, wdth truncate ends ; front view 

 linear lanceolate, truncate, = Falcatella 

 Romana, Rab D. p. 46, pi. 5. f. 1. Italy. 



Doubtful or insirfficienthj described 

 Species. 



N. varians (Greg.). — Form and size 

 variable ; strife oblique, 1 4 to 18 in 

 •001", nearly reaching the median line, 

 more conspicuous opposite the central 

 nodule, and highly radiant. TM. iii. 

 p. 12, pi. 2. Britain. In this species 

 Professor Gregor}' disregarded form and 

 size, considering the number and dispo- 

 sition of the strise as the essential cha- 

 racters. 



N. mutabilis (Greg.). — ^Form and size 

 variable ; strife as in N. varians, but 

 finer, and from 24 to 26 in -001". TM. 

 iii. p. \L= Pinmdaria exigua, MJ. ii. 

 pi. 4. f. 14. Britain. We concur in 

 opinion with the late Professor Smith, 

 that these species are too vaguely de- 

 fined, and that probably they are con- 

 stituted of forms belonging to various 

 other species. 



N. mimdissima (Rab.). — Exceedingly 

 minute, but with distinct median nodule. 

 Rab D. p. 39, pi. 6. f. 80. Persia. 



N. meqalodon = Pinnularia mecjalodon, 

 EM. pi.' 33. 14. f. 21. America. The 

 central portion of a large, oblong species, 

 with stout, distant, parallel costfe, which 

 do not reach the median line. 



N. ompludia (E.). — Large, iridescent, 

 Math very fine, granulated, decussating 

 lines; umbilicus orbicular, solid, hyaline, 

 divided by the straight median line. 

 Fossil. Fragments in Bermuda deposit. 



