322 CONTRIBUTIONS PROM nil. NATIONAL BERBARITTM. 



Tessella catena Ehrenb. [nhiB. 202. pi. O.f. L838, Dot kali-. Ann Mag. Nat 

 12: 04. -' r. L843. 



- it- .. Dan. 180. pi. St. L819? 



;• 16.1832. Ralfe, Ann. Mag. Nat. Hist 11:456 pl.9. 

 L843? qoI S / Ehrenb. [nfua. 230. pi L838 



Km/. Bacill. 126. pi L844. \\ Smith, Synop. I'.rn. 



Diat. 2: 34. pi. ■ • a b . L853 . < leve, Bih. 8v. Vet. Akad. 



111:.:. L873 Pritch. Bist. [nfua. ed. 4. 804. />!. W.f. 



L861. II. I.. Smith, Sp. Diat.Typ.no. 133. L874. Cleve A Moll, type q< 

 - ini.li. Atlas pi. W Grun. Verh. Zool. Bot.Oe8.Wien 12: 423. 



1862. Van Heur. Synop. pl.54.f. U 16. L881; Treat. Diat. 360./. Ml. pi. I 



O'Meara, Proc. Roy. [fish Acad. II. 2: 318, Dot pi. 1875. 



Rabh. Fl. Eur. Alg. 1: 306. L864. De Toni, Syll. Alg. 2: 761. 1892. 

 Ehrenb. Mikrog. pi. 35 A. XXIII. /. i, 16. L854. 

 donema crozierii Grun. Verh. Zool. Bot. Gee. Wien 12: 123. L862, Dot /■ 

 Ralfs in Pritch. Bisk [nfua. ed. I. B05. pi. .;./. ;.;. L861, dot II. L. Smith, Sp. 

 Diat.Typ.no. 134. L874, aor Schmidt, Atlas pi. ItO.f.S 11. L899; pi. ttl.f. i hi. 

 moil. 



A- w ill be seen by the above synonymy, there i? greal confusion among the names 

 assigned to this diatom. A.- Cleve points out, fl there is do important difference 

 between R. arcuatum Kutz. and Grunow's R based on S. crozierii Ehrenb., 



the Bimple difference of outline being of do account. Bu1 the R. crozierii of Ralfe 

 is an altogether different thing, h corresponds in its < l i 1 n t < -* I center with the 

 variety of arcuatum which Cleve calls variety ventricosumfi but in all other respects 

 il i- unlike it. Probably, as Cleve states, it is reproduced by Janischt and called /.'. 

 arcuatum. Whereas R. arcuatum Kutz. and R. < ozu Ehrenb. Grun. has monili- 

 form striae or Btriae so nearly divided as to appear like a string of beads, the diatom 

 shown by Ralfs, 11. I.. Smith, and Schmidt has transverse costae bearing fine punctate 

 dots in a Bingle median line, and whereas I he zonal divisions of the former are strongly 

 beaded, those of the Latter are finely doited with one or two rows of puncta. Babir- 

 shawd masses all these forms together, with the resull that he make- this species and 

 Tessella arcuata Ehrenb. I Striatella, probably S. wnipunctata) synonymous, an evi- 

 dent absurdity. 



I think Diatoma arcuatum Lyngb., and Striatella (intuitu C. Air., are Dot the same 

 diatom; a question doI relevanl here, as neither can be Bafely identified with this 

 species. My specimens are uniformly of the outline of Cleve's variety ventri- 

 cosum, but with coarse beading on the valves and heavy markings of the zonal septa, 

 as figured by Schmidt . ' 



Found at stations 3607, 3688H, 3712H, Bering and Okhotsk seas. 

 Tessella japonica (Temp. & Br. I Mann. 



Rhabdonema japonicum Temp. & Br. Mem. Soc. Phys. el Bist. Nat. Geneva 30'-': 

 53. pi. /../'. 6. L889. De Toni, Syll. Alg. 2: 762. L892. Schmidt, Atlas pi. 118. 

 f. ; •;/. pi. 119. f. 1-4, 6-12. L899; pi. .'.'/./. U. L900. 



Rhabdonema mikado Pant. Beitr. Bacill. Qng. 3: pi. SS.f. [69 [70. L893 Schmidt. 

 Aila- pi. 119. f. .'-', (note). L899. 



I have examined a large Dumber "t" specimens, compared with care all literature, 

 together with figures, to get a clear-cul and satisfactory basis for distinguishing between 



a Bih. Sv. Vet. Akad. Bandl. 1": 24. L873. 

 b< ip. en. pi ;./. it. 

 c Rabh. Beitr. 1: L2. pi. S.f. 19. L863. 

 <*Hab. Cat. 301. L877. 



e Schmidt , Atlas pi. 220. J. 1899. 



