MANX-^I)IAT0."\1S OF Till; ALISATllOSS VOVACKS. 335 



A[<X. 2: '.YA. 1891. O'.MrLini. Pnu'. Ruv. Iri-li A. ad. 11.2: :^84 (/)?. ^.^ /'. .:<>. wnrlh- 



lessV 1S75. CU'Vf, Sv. Vet. .\ka(l. ITandl. 26-: HI. 1S!M. Pritcli. lli<l, Infu?. 



ed. 4. HIH). 186 1. 

 A7//v'r///a _^^sra (Ire:^ vurit ly; Sclnui'.li. \{l\^ p!. 7./ / -f. !S7o; .hiliresh. 



Koniin. I)euL.Meere2: yv?. S,f. i^S. 1S7-1. 

 Aar(Vw/^/ ,^r//**Mn" Wrvh. vuririy; Van TTiMir. Treat. Diat. ]98. ISOG. 

 Tliis iKMulifiil iorm i^^. as Van Heiink claims, near In -V. Hmiihii l^reh., but is vaMly 

 finer and. so far as Iliave seen. ii never -Imws ilie .]nul>le-l>eade<l striae of thai speeies. 

 it^ striae beiiiir delirute and nl)sciirelv n^nni lift inn. Its reseinl>lan(e to X.fu.sca (Greg. ) 

 Raifs is also stipcrflcial. S( hniifits Ii;^niros mI tluit sjirtaes quoted above are <iuitedis- 

 tinclfroni (iregory V type. (^ri,<;inally pul)li.-he(l as X. f<}}iit}fn Breb. variety fffscaGreg.. 

 its true name Jor us Tlalfs, who makes it a sei>arnto species, says/' it'^liffers from N, 

 Sittllhli Hreb. in its much larirer size and more distinct striae." It is, therefore, even 

 mure strongly in contrast Avith the present species, and I agree Avith ricve and De 

 Toni in recognizing its distinctness. Thepeculiar termination of Uu^wu halves of the 

 raphe at the center of the vahe '> is well tlisplayed in a specimen accompanying this 



rejtorl. 



Ft)und at station 2020II. Hawaiian Ishuids. 



r 



Navicula anceps ([^hrenl>.) ^blI^l. 



Siavwnris amrp^ P:]irenl>. Phys. Aldi. Alsa(i. Wiss. Herb 1841: 300. 422. pL 2, J.f, 

 1S.\M\\. Kl'itz. [*>acilb lOo. yj/. .-'.v./. .;. 1S14. \V. Smith. Synop. Brit. Diat. 

 1: (JO. pJ. 19. f. VJO. isr>:]. Bmn, Diat. Alp. ^'\. pi. V./. i-J. 1880. Van Ileur. 

 Synop. GS. pi. .;./ ; .V. ISSl: Treat. Diat. Kif). pi U J. 55-:y7. 1890. Schnm. 

 sihrift- Phys. Okon. (ies. KOnigsl). 5: 22, 2>1. 2. f, 21. 1S(M, Wolle, Diat, 

 N. A. p\. S.f. 4 (not/. S U). ISIH). De Toni, Sylb Alg. 2: 211. CSeve, Sv. Vet, 

 Akad. Fhuulb 26-: 1 17. bS91. Tleve k Hrun. Sv. Vet. Aka<b llamlb 17-: 48. 



2)?. S.f. 65. ]880. 



Staffroneis aviphkrphahi KCitz. P-acill. 105. p]. .ULj. 25. 1844. T*riuh. Hist. Infus. 

 ed. 4. 912, 1861. S(hum. S(brift. Phys. Okon. (ies. Konigsb, 22. pJ. 2.f. 29, 18G4. 



StaurondsUncam Ehrcu\). Phy.-. Abh. Akad. W'-s. Ik^rb 1841: 800. pi. 1. ILf. IL 

 1843 ?; Mikrog. pi S9. JI.J. 106. 18o4. 



In adopting the above name to rei)resenl this widely known aTid variable tliatoni 

 I am led l;y considerations of policy on^y. If a strict observance of ])rioriiy were fob 

 h>wed Ehrenberg's Ihuaris would probably have to su]>erse<le his cmcfps. as the former 

 ai>i)ears earlier in both the text and plates of his article. Cleve^^ (piestions the union 

 of Uncaris with this species. To me it seems inii>ossihle to diagnose eitlier (»f ihem with 

 any accuracy. Certainly the numerous figures of both given l>y Ehrenberg represent 

 a (^onsiderable number of species. And it is because I can not see the boundaries of 

 these two namoe^by means of the original citations that Tarn unwilling to overturn the 

 ai>ove aceei>ted and widely-known si>ecific name for a theoretically earlier one. Diatoms 

 diff(T:Vrtni mostothert^rgauisms in that their minuteness and delicacy of structure are so 

 extreme that only by the Ihiest lenses and the most exact drawings can their specific 

 characteristics be seen and recorded. As a consecpience, most of the earlier observa- 

 t ions of the more minute diatoms are untrustworthy, and too much w^eight is attached to 

 tlu^ names assigned in these writings. A large part are veritable nomina nuda.and 

 should be given consideration only when subsequent repetitions establish their char- 

 acter. For this reason ana p^ \> to be preferrtMl to Jinrarh. The union of the Siau^ 

 roneis diatoms with. Xavi<-ula has lieen disi-usscd under the genus. 



Found al station IjOGDH. along Kurile ('luiin. 



'M'riich. Hist. Infus. (h1. 1. 898. ISiil. 

 ^'("i. Schmidt. .Atlas yj/. : . f. ^h 1875, 

 CSV. Vet. Akad. Handb 26': 147. 1894 



