908 



SYSTElVLiTIC HISTOEY OF THE INFUSORIA. 



slender, linear-oblong or linear lanceo- 

 late, with obtuse apices ; 12 to 14 radiant 

 costte in 1-1200", shorter opposite the 

 central nodule. KB. p. 97, pi. 4. f. 18. = 

 Pinmdaria viricUs, E., in part ? ; Nadcula 

 viricMa, E. (ix. 133-136.) Common. 

 1-3000" to 1-280". 



N. hemiptcra (K.). — Narrow, linear- 

 oblong-, with obtuse, conic apices, and 

 14 or 15 radiant costie in 1-1200", which 

 do not reach the median line. KB. 

 p. 97, pi. 30. f. 11. = Pinnularia hemiptera, 

 SD. ii. p. 95. America, Europe. Front 

 view linear, with rounded angles. Often 

 overlooked from its resemblance to A^. 

 viricUs, fi'om which it is distinguished by 

 its finer stiifo and narrower valve. 



N. cequinoctiaUs (Mont.). — Rather 

 large, linear-oblong, with rounded apices, 

 and 4 stout, radiant pinnules in 1-2600". 

 Montague, Annales des Sciences Nat. 

 1850, p. 309. Guiana. 1-260" to 1-150". 

 In form it resembles N. Dactijlus, but 

 differs in its size and much larger striae. 

 In the latter respect it approaches to N. 

 ixichyptera, but has not the median infla- 

 tion of that species. 



N. pleuropliora (K.). — Large, stout, 

 oblong, or linear-oblong, with broadly 

 rounded ends, and 6 stout costse in 

 1-1200". KA. p. 79. =Pimmlaria costata, 

 EM. pi. 4. 2. f. 5 ; Pimmlaria megaloptera, 

 EM. pi. 3. 1. f. 4. America, Asia. 



N. Suecica (E.). — Oblong-elliptic, with 

 broadly roimded ends, short, stout, rather 

 distant marginal costce, and large central 

 blank space. E Inf. p. 189, t. 21. f. 18. = 

 Pinnularia Suecica, EM. Fossil. Sweden. 

 N. lota (Breb.). — Large, linear-ob- 

 long, with roimded apices, and 8 stout 

 costre in -001", which do not reach the 

 median line, and are shorter and some- 

 what connivent opposite the central 

 nodule. KA. p. 79. = Pinnularia lata, 

 SD. i. p. 55, pi. 18. f. 167. France, Bri- 

 tain. Front view very broad linear, with 

 rounded angles, truncate ends, and 

 striated margins; the central nodules 

 large. This species approaches closely 

 in character to iV. Suecica. 



N. Digitus = Pinmdaria Digitus, EM. 

 pi. 33. 8. f. 15 ; pi. 38 a. 3 b. f. 1. Ame- 

 rica, Java. This species is figm^ed as 

 large, linear-oblong, with broadly 

 rounded ends, and stout, parallel costae 

 which do not reach the median line. 



N. Dux =i Pinmdaria Dux, EM. pi. 8. 2. 

 f. 5. Fossil. Hungary. Ehreuberg repre- 

 sents it as large, elliptic-oblong, with 

 rounded ends and divergent costae, which 

 do not reach the median line, and are 

 shorter opposite the central nodide. 



N. ostrearia (K.). — Small, elliptic- 

 oblong, with rounded ends, large central 

 nodule, and close, fine striae. KA. p. 77. 

 Marine. France. 



N. retusa (Breb.). — Striated, nan'ow- 

 linear, with roimded ends ; front view 

 broad, quadrate, with rounded angles, 

 ti-uncate ends, and concave and striated 

 lateral margins. Breb DC. p. 16, pi. 1. 

 f. 6. Marine. Europe. The frustules 

 are much compressed ; and consequently 

 the front view is so much broader than 

 the lateral surfaces, that it is difiicult to 

 obtain a good sight of the latter. N. 

 retusa, N. apiculata, and a few allied spe- 

 cies probably ought, as suggested by M. 

 de Brebisson, to form a separate group, if 

 not a distinct geniLS, distinguished by 

 the great comparative breadth of its 

 front view, with its striated and sinu- 

 ated or constricted lateral margins. 



N. scita (S.). — Nitescent, linear-ob- 

 long, with attenuated, obtuse ends; striae 

 verv faint, 45 in -001" ; nodule small. 

 ANH. 1857, xix. p. 8, pi. 2. f.4. Pyrenees. 



N. parvula (Greo-.). — Small, narrow 

 linear "lanceolate, with obtuse ends and 

 distinct costa3, which do not reach tlie 

 median \me. = Pinnularia parva, MJ. ii. 

 p. 98, pi. 4. f. 11. MuU. 



2t Valves linear or oblong, with 

 cimeate ends. 



N. ampkigomphus (E.). — Large, 

 broadly linear, with sharply cuneate ends, 

 with or without obscm-e longitudinal 

 lines ; striae obsolete or distinct. EA. 

 p. 129, pi. 3. 1. f. 8 ; EM. many figm-es. 

 America, iVsia, Europe. Lough Moume 

 deposit. j3, striae distinct. = Pinnularia 

 ampUigmnphus, EM. pi. 14. f. 11. 

 Cayenne, France. 



N. dilatata (E.). — Large, oblong or 

 broadly linear, with obtuse, cuneate ends, 

 and furnished with longitudinal lines 

 near the margins. EM. many figiu*es. 

 Europe, Lough Mourne. 



N. disjyhenia (E., K.). — Linear, elon- 

 gated, with shai-ply cuneate ends, finely 

 striated near the margins. KB. p. 93, 

 pi. 28. f. 54. = Pinnularia clisjjhenia, EA. 

 p. 132. America, Australia. Approaches 

 to N. amjyJiigomphus. 



N. acuta (K.). — Narrow-linear, smooth, 

 with acute, shortly cimeate apices. KB. 

 p. 93, pi. 3. f. 49. Island of Wangerooge, 

 Australia. 



N. subaada= Pinnularia suhacuta,'FM. 

 pi. 35 A. 6. f. 12. Perth, Australia. 

 Ehrenberg's figure represents this species 

 as linear, with cimeate apices, fine, close, 



