^.J~fl - I M -m- ^,r- w r- .— ^ D ' P 



MANX DlATOMtS OF TilE ALBATROSS VOYAGES. 333 



Small specimens of the presonf speckles approach ('lo.«(^ly to robu^^t ppociincTis of 

 C. adrianca Kiitz., a \'A\'\v[y ol C. scMkilinn Ehronb., (lie i)est mark of distinrfion 

 being ihe round and wid(^ly set beads of (\ splrndida and the more compaet and 

 reetangular beads of C scutellitm. 



Found at station 'MM'>j off Honshu Island, Japan. 



• NAVICULA Bory. 



Xaiinda Bory, Encycl. Meih. d'llist. Nat. 2: 5(52. 1824. Ehrcnb. Infus. 173. 1838. 

 Kill/.. Bacin. 88. 1844. De Toni, SylL Alg. 2: (1. 180L W. Smith, Synop. IJrit. 

 Dial. 1: 40. 1853. Donk. Brit. Diat. 2. 1871-1873. Van Ileur. Synop. 71. 1881; 

 Treat. Diat. 162. 189G. Caslr. Kep. Voy. Chall. Bot. 2: 22. 188G. Pritch. Hist. 

 Infus. ed. 4. 892. 1861. Rabh. Fl. Eur. Alg. 1: 168. 1864. Cleve, Sv. Vet. Akad. 

 Handl. 26-: 4, 136. 1894; 274 If). 1895. Heve & Grun. Bih. Sv. Vet. Akad. 

 Handl. 17-: 27. 1880. Grun. Verb. Zool. Bot. Ges. Wien 10: 513. 1800. Brun, 



Diat. Alp. 63. 1880. 

 riunidarla Ehrenb. Ber. Akad. Wiss. Berl. 1840:213. 1841. W. Smith, Synop, 



]5rit. Diat. 1: 54. 1853. 

 Diplonns Elirenb. Ber. Akad. Wiss. Berl. 1844: 84. ]845. Clevo, Sv. Vet. Akad. 



Ilandl. 26-: 76. 1894. 

 Slauroptera Ehrenb. Phys. Abh. Akad. Wiss. I?erl. 1841: 134. 1843. 

 ^tauroncis Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 134. 1843. Kiitz. Baeill. 



194. 1844, De Toni, Syll. Alg. 2: 204. 1891. Van Ileur. Treat. Diat. 158. 1896. 

 rhuroataiiron Rabh. in part; Grun. in Fenzl, Reise Novara Bot. 1: 101. 1870. 

 />frHfia Berk, in part; Van Ileur. Synop. pL if;./. i6), 1881; Treat. Diat. 233. 1896. 

 Anomoeoneis Pfitz.; Cleve, Sv. Vet. Akad. Handl. 27*': 6. 1895. 

 XrifKurnVfitz. in Ilanst. liot. Abhandl. 2: 39.1871. Cleve, Sv. Vet. Akad. Ilandl. 



26': 68. 1894, 

 Cahmeis Cleve, Sv. Vet. Akad. Ilandl. 26': 46. 1894. 

 Stenoncis Clcve, Sv. Vet. Akad. Ilandl. 27-^: 123. 1895. 

 Fraalulia G. Ag. in part; Kiitz. Einnaea 8: pL l-J-f. i6'. 1833. 

 Cynibdla ('. Ag. (^Cocconema Ehrenb.) in part; Gonsp. Diat. 8. 1832. 

 Syiialra Elirenb. in part; Kiitz. Baeill. 63. pi. 3. J. 29. 1811. 

 Aii^phiprora Ehrenb. in part; Mikrog. pL3. I. f. 10-11, III. f. Sa-r, ]S54. 

 Schizonema G. Ag. in part; W. Smith, Synoj). Brit. Dial. 2: 71. 1856. 

 Colletonfrrta^reh. in part; W. Smith, Synop. Brit. Dial. 2: 70. pi. 56. f .351-353. 1856. 

 Achnanthnlium Kiitz. in part; W. Smith, Synop, l^rit. Dial. 2: 31. pi. 61./. 3SiL 1856. 

 Pleurosigma W. Smith in part; Ehrenb. Infus. 180. pL 13, f. 10, Kiitz. Baeill. 102 

 v'no. 127, 128, etc.) pi. 4j- 25, 26. etc. 



The enormous size of this genus has incited many authors to attempt its division 

 upon more or less tenable ground-s. Thus Ehrenberg divided it into Navieula (Pmry) 

 Ehrenb, and Pinnularia Ehrenb., the chief distineti(m being that the formcT had 

 smortth, th(* latter ribbed, valves. But the distinction was seen to be fictitious, and 

 Kiitzing and Brebisson refused to accept it. William Smith revived the names, 

 making the distinguishing feature th(^ character of the striation, that in Pinnularia 

 being composed of smooth costa^, while Xavicula had the striae broken more or less 

 iiUo moniliform or Ijeaded lines. This would 8erv(^ admirably to distinguish such 

 species as Pinnularia nohilis Ehrenb. from yaviciilti aspcra Ehrtmb. But two diflicul- 

 *^ies have stood in the way (jf making application of this distinction in general; first, 

 very frw of the multitude of species in the g(*nus can be positively clasHifiiHl by this 

 criierion, every conceivable gradation between plain (or apparently plain) costae and 

 rows of independent beads being presented: and, second, in <'\vu the extreme Pinrnila- 



r 



ria type the apparent pr(^senc(M>r absence of perf(H'lly smooth bars or costae is largely 

 anuitterf>f illinninatirm. ]t is true that seientifi( <'lassifif'ations are chiefly valuable 



