OF THE NAVICULEJ;. 



005 



N. ohtusa (E.). — Small, oblong-lan- 

 ceolate, with obtuse, rounded apices. 

 EA. p. 131, North America, Asia, 

 Africa. Kiitzing thinks it probably 

 identical with N. appendiculata. 



N. injlexa (Greg.). — Small, lanceolate, 

 with subacute apices; costfe conspi- 

 cuous, 26 in -001", highly radiant, nearly 

 reaching the median line, except oppo- 

 site the central nodule, where they are 

 short, leaving a large, roundish blank 

 space. =Pinm(laria b^exa, TM. iv. p. 48, 

 pi. 5. f. 20. Scotland. Beneath each 

 apex is a strong, dark cross-bar, pro- 

 bably caused by a depression, Greg. 



N. fortis (Greg.). — Small, oblong- 

 lanceolate or somewhat rhomboid, \\-ith 

 obtuse apices ; costae conspicuous, 16 in 

 •001", not reaching the median line, 

 gradually shorter and more radiant near 

 the central nodide. = Pinnularia fortis, 

 TM. iv. p. 47, pi. 5. f. 19. Scotland. 

 Tm-gid ; costse prominent, so as to appear 

 more distant than they actually are. 



N. mutica(K.). — Very minute, smooth, 

 turgid-lanceolate, -udth distinct median 

 and terminal nodides. KB. p. 93, pi. 3. 

 f. 32. Wangerooge. 1-1560". 



N. Jurgensii (K.). — Minute, smooth, 

 turgid or oblong-lanceolate, with obtuse 

 apices and obsolete median nodide ; front 

 view broadlv linear, with truncate ends. 

 KB. p. 93, pi. 3. f. 8. Jsland of Wan- 

 gerooge, Germany. 1-720". 



l>s. viridula (K.). — Small, lanceolate, 

 with obtuse, slightly produced apices; 

 strise wanting or indistinct. KB. p. 91, 

 pi. 4. f. 10. 15. Europe. 



N. carinata (E.). — Large, lanceolate ; 

 front view linear, with a broad dorsal 

 longitudinal keel. EB. 1840, p. 18. 

 Fossil. Shores of the Rhine, in volcanic 

 schists. 1-216". 



N. diaphana (E.). — Large, smooth, 

 diaphanous, elongated, lanceolate, with 

 obtuse apices ; the umbilicus intercepting 

 the double median line. EB. 1845, 

 p. 78. Guiana. 1-192". Habit of Stau- 

 7'oneis phoenicenfc'ro}i. 



N. Schombto'f/kormn (E.). — Large, 

 elongated, lanceolate, with obtuse apices, 

 and the habit of iV. diapJuoia, but with 

 three longitudinal median lines. EB. 

 1845, p. 79. Guiana. 1-180" 



N. latiuscida (K.). 

 oblong or elliptic-lanceolate, with rather 

 obtuse apices ; strise shorter opposite the 

 central nodule, 10 to 12 in 1-1200". 

 KB. p. 93, pi. 5. f. A:0. = N.i)atula. SB. 

 i. p. 49, pi. 16. f. 139. Europe, Ireland. 

 Twice as long as broad ; front view 

 broadlv linear, with truncate ends. 



Bather large, 



N. ScJiomhurgMi (E., K.). — Large, 

 lanceolate, equal, three times as long 

 as broad, with subacute apices, and 25 

 stride in 1-1152". KA. p. 71. = Pin- 

 nularia Schornhurgkii, EB. 1845, p. 80. 

 Guiana. Is smaller and more obtuse 

 than N. cequaUs. 



N. palpehralis (Breb.). — Broadly lan- 

 ceolate, with subacute apices, and 27 

 radiant strise in -001", which do not 

 reach the median line. SD. i. p. 50, 

 pi. 31. f. 273. Marine. France, Britain. 

 Striae short, leaving a lanceolate median 

 blank space. 



N. angulosa (Greg.). — Broadly lanceo- 

 late or oblong, with subacute apices; 

 striae conspicuous, short, forming a nar- 

 row marginal band, shorter near the 

 middle, and leaving a smooth, rhomboid 

 median space. TM. iv. p. 42, pi. 5. f. 8. 

 Marine. Britain. N. angidosa is larger 

 than N. jmlpebralis, and the angidar me- 

 dian space is a good and permanent mark 

 of distinction; nodule definite. 



N. radiosa (K.). — SmaU, slender- 

 lanceolate, with subacute apices, and 

 fi'om 15 to 18 distinct, radiant striae in 

 1-1200". KB. p. 91, pi. 4 f. 23. = Pin- 

 nularia radiosa, SD. i. p. 50, pi. 18. f. 173. 

 Gei-many, Britain. With stronger striae 

 than N. gracilis. 



N. vulpina (K.). — Rather tiu'gid, lan- 

 ceolate, with acute apices; front view 

 broadly linear, with tnmcate ends and 

 punctate margins ; striae obscure. KB. 

 p. 92, pi. 3. f. 43. Germany. Inter- 

 mediate between N. gracilis and N. cus- 

 pidata. 



N. cuspidata (K.). — Broadly lanceo- 

 late, wdth acute apices, a very minute, 

 orbicular central nodule, and close, very- 

 fine transverse striae. KB. p. 94, pi. 3. 

 f. 24, 37 ; SD. i. p. 47, pi. 16. f. 131. = Na- 

 viculafulva, EM. many figm-es. Common. 

 Em-ope, Asia, Africa, x\merica. (xn. 5.) 

 Front view narrow-linear. 1-1150" to 

 1-180". The lateral view is broader and 

 more rhomboid than in N. gracilis. 



N. Cafitonensis (E.). — Broadly oblong- 

 lanceolate, with acute, slightly produced 

 apices ; striae wanting or indistinct. EB. 

 1847, p. 484. Canton. 1-480". It difters 

 from N. cusjridata in its shorter and acute 

 apices. 



N. amphisphenia (E.). — Lanceolate, 

 navicidar, gradually attenuated into the 

 apices, with an oblong median nodule; 

 striae wanting or obsciu'e. Exl. p. 129; 

 EM. pi. 9. 1. f. 16. America, Asia, Africa, 

 Europe. Distinguished from N. cuspi- 

 data by its oblong nodide. 



N. phyllepta (K.). — Minute, slender^ 



