MWN DIATOMS OF I II I ALBATROSS VOYA< 321 



Two references found In Ehrenberg's works should be excluded here.° In both of 

 these casee Ehrenberg expresses doubt by an interrogal ion |>"im . Grunow' — lection 

 of the specific name parallt la over thai of stricta, copied bj I »• Toni, is inadmissible. 



Found al station 2807, Galapagos [slands. 



TESSELLA Ehrenb. 



Tessella Ehrenb. [nfus. 202. pi. ■ L838 In pari exclusive of Striatella 



Forms, e. g. Tesella arcuata Ehrenb. . Ralfs, Ann. Mag. Nat. Eist. 12: 104. pi. 



:./. !. L843 qoI Ralfs in Pritch. Hist. [nfus. ed. 1 804. pi. 8.J.5; qoI Kutz. 



dot < >'Meara . 

 - iatellaC. Ag. in part; Ralfs, Ann. Mag. Nat. Hist. 11: 155. pi. 9.f. 6. L843. 

 Rhabdonema Kin/. Bacill. L26. pi. 21. II. f. U pi. 18. f. 6. L844. \Y. Smith, Synop. 



Brit. Diat. 2: 32. pi 38. 1853. Rabh. Fl. Eur. Alg. 1:305. L864. Pritch. Hist. 



[nfus. ed. 4. 804. 1861. Van Heur. Synop. L65. L881; : ///. 



L896. De Toni, Syll. Alg. 2: 760. L892. Grun. Verh. Zool. Bot. Ges. Wien 



12: 422. L862. 

 This L r ''ini< was constituted in L838, though the name appears in literature in KIT.'; 

 As defined and figured by Ehrenberg il is truly synonymous with Kiitzing's Rhab- 

 donema. Its type species, / caU na, is idenl ical with />'. arcuatum Kiitz., and bo 

 nized by Kutzing; while Kutzing's type species, /.'. minutum, is recognized by him to 

 be T. catena Ralfs ool Ehrenb. and its citation quoted. Ii is true thai Ehrenberg 

 probably included a species of Striatella < !. Ag. in his genus Tessella, namely, T 

 rupta\c l)in he recognizes Striatella C. Ag. as a distind genus, gives it with diagnosis 

 and figures, and thereby iimiis by exclusion his own genus Tessella. A reading of his 

 discussion of Striatella d will make il evidenl thai his Tessella can nol be the same. 

 All of the three species named by Kutzing in his new genus Rhabdonema were pre- 

 viously named and figured as species of Tessella and are so recognized by him. He 

 therefore should have emended the genus of Ehrenberg rather than have superseded it 

 with Rhabdonema. He does, it is true, give Tesselia as a separate genus, bul ii fails 



rrespond to the original and the Bingle -peri,- he mentions i- a Striatella. Under 

 these circumstances Ehrenberg's name should be restored and simply emended by 

 exclusion of rrustules having interrupted septa. 



Tessella adriatica Kutz. Mann. 



Rhabdonema adriaticum Kutz. Bacill L26. pi. 18. f. 7. L844; Sp. Alg. L15. L849. Pritch. 

 Hist. [nfus. ed. 4. 805. pl.lS.f. 27. L861. W.Smith, Synop. Brit. Diat. 2: 35. pi. 

 • f.S05 b, a', &'. L856. Grun. Verh. Zool. Bot. Ges. Wien 12:424. L862. 

 Jan. & Rabh.in Rabh. Beitr. 1:11. pi. S.f. 20. L863. Rabh. Fl. Eur. Alg. 1: 306. 

 L864. O'Meara, Proc. Roy. Irish Acad. II. 2: 319. L875. H. L. Smith, Sp. Diat. 

 Typ. no. 432. L874. Van Heur. Synop. L66. pl.54.f. tl IS. L881. Truan,Anal. 

 - c. Espan. Hist. Nat. 14: 68. pi. 8. /'. 15. L885. I>. Toni. Syll. Alg 2: 

 L892. Wolle, Diat. X. A. pi. 51. f. I :. L890. Schmidt, Atlas pi. 217. f. 

 L895; pi. 221. f. /.. L896. 

 Tessella sp.?Lobarz. Linnaea 14: 270. pi. ,./. 2. 1840, according to Kiitzing and I><- 



Toni. 

 Found a i >tati<m- 2836, 3698H, 3712H, -if Lower California and in < Okhotsk - . 



o Phys. Abh. Akad. Wiss. Berl. 184'7: 448. pi. :. Illy ... 1849; probably 

 liesof Fragillaria; <<\>. «it. 1870: 72. pi. 1. I. f. [8 a-d. L871; probably a Navicula. 

 & Pin-. Abh. Akad. Wiss. Berl. 1835: L73. I-:.:. 

 ■ Ehrenb. [nfus. 202. L8 



d Op. tit. 229-230. 



