MANN DIATOMS OJ I'll VLBATROSS V'OVAl 335 



Alg. 2: 93. 1891. ( I'M earn Proe. Roy. Irihh Acad. II. 2: 384 pi. ■■ nrtli- 



less . i v Vet. Akad. Handl. 2;; Pritch. Hist. Infus. 



ed. I. 899. 1861. 

 Vaxricula \ ca Ore variety; Schmidt, Atlas pi. l.f. - • Jahresb. 



K< .linn. Deut. Meere 2: y 5. 187 I. 



Vq reb. variety; V r an 1 1 < ur. Treat. Diat. 198 



This beautiful I rck claims, near to .V. smithii Breb., bul is vastly 



finer and, so far as Ih * the double-beaded striae of tl 



its striae being delicate and obscurely mon iliform. I tsxesemblan* 



- also superficial. Schmidt's figures of thai spe< I above are quite dis- 



i iini from Gregory - type, origii ally published thii Breb. variety 



its true name, foras Ralfs, who makes il il "differs from A. 



smithii Breb. in its much larger size and more distinct -trine." Ii is, then 

 more strongly in contrast with the presenl species, and I agree with Cleve and De 

 Toni in recognizing its distinctness. The peculiar termination of the two halves of the 

 raphe al the center of the valve & is well displayed in a specimen accompanying this 

 report. 



Found al station 2920H, Hawaiian Islands. 



Navicula anceps Ehrenb. Mann. 



Stauroneis anceps Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 306, 122, pi 



1843, Kiitz. Bacill. L05. pi - W. Smith. Synop. Brit. D 



1:60. pi 19. f. 190. 1853. Brun, Diat. Alp. 89. pi 9.f. 1 2. 1880. V T an I! 

 Synop. 68. j 8. L881; Treat. Diat. L60. pi l.f . L896. Schum. 



Schrift. Phys. Okon, Ges. Konigsb. 5: 22. pi 2. f. 27. L864. VVolle, Diat. 

 N. k.pl.l If. 8-9). L890. De Toni, Syll. Alg. 2:211. Cleve, Sv. 



Akad. Handl. 26- L47. 1894. Cleve & (.run. Sv. Vet. Akad. Handl. 17-: 48. 

 pi .,./. 65. 1880. 

 Stauroneis amphicepkala Kiitz. Bacill. I0b.pl. 30. f 25. L844, Pritch. Hist, Infus. 

 ed. 1. 912. L861. S< hum. Schrift. Phys. Okon. Ges. Konigsb. 22. pi 



oneis linearis Ehrenb. Phys. Abh. Akad. \\ "■'•-. Berl. 1841:300. pi. !. II. t. 11. 

 L843 V: Mikrog. pi S >. II. f. 106. L854. 

 In adopting the above name to represenl this widely known and variable diatom 

 I am led by consideral ions of policy only. If a stricl observance of prioritj were fol- 

 lowed Ehrenberg's linearis would probably have to supersede his - the f inner 

 appears earlier in both the texl and plates of his article. Cleve c questions the union 

 of Ii maris with this species. To me it seems impossible to diagnose either of them with 

 any accuracy. Certainly the numerous figures of both given by Ehrenberg re] 

 a considerable number of species. And il is because 1 can nol see the bound; 

 these two names by mean- of the original citations thai I am unwilling to overturn the 

 above accepted and widely -known specific name for a theoretically earlier* • Diatoms 

 di ffer from mosl other organisms in that their minuteness and delicacy of structurt 

 extreme that only by the finest lenses and tl sad drawings can theirspecific 

 characteristics be Been and recorded. As a consequence, mosl of the earlier observa- 

 fthe more minute diatom- arc untrustworthy, and too much weight is attached 1 • 

 the names assigned in these writings. A large pari are veritable nomina nuda. and 

 shouli sideration only when subsequenl repetitions establish their char- 

 a< ter. For this reason anceps is to be preferred to linearis. The union of the - 

 roneis diatom- with Navicula ha- been discussed under the genus. 

 Found al station 3669H, alona Kurile Chain. 



a Pritch. Hist. Infus. ed. I - 18 $61. 

 Schmidt, Atlas pi : . f. . 1875 

 Vet. Akad. Handl. 23 : 147. < 



