. J 



MAKN DIATOMS OF THE ALBATROSS VOYAGES. 317 



Euodia gibba BaiL; Pritcli. Hist. Infus. ed. 4, 852. pi 8.f. 22. ISCVl. II. L. Smith, 



Sp. Diat. Typ. no. 161. 1874. Rabh. Fl. Eur. Alg. 1: 318. 18G4. De Toiii, Syll. 



Alg. 2: 1325. 1894. Van Ileur. Treat. Diat. 538. /. 285. 1S9G. Wolle, Dial. N, 



A. pi. GS.f. 26. 1890. 

 Dichomeris subtilis p]]irenb. Phys. Abh, Akad. Wiss. Berb 1861: 294. 18G2; 1872: 



205. pi 9 J, 8. 1873, 

 Euodia inornata Castr. Rep. Voy. Chalb Jiot. 2: 149. pi 12. f. L 1886? 



Th(^ last name above is doubtfuL It agrees very closely with ^\'allich's figure, but 

 is a larger diatom with finer markings. I do not include here I^hrenberg's Gonio- 

 tlecivtn anaulus.^ Though plainly a member of this genus^ it is not easily united with 

 this species.^ It is evidently a very coarsely marked form. HabirshaWj though 

 placing it with the at)ove, questions it. ^\'iUiout an accurate description, which it 

 lacks, I consider its union here somewhat arl)itrary and illustrative of tlie tendency 

 mentioned above, to l)lend all similar forms with the original species of Wallich. 



Hemidiscus rectus (Castr.) Mann. 



Euodia recta Castr. Hep. Voy. Chall. Bot. 2: 149. pi 12. f. S. 1886. De Toni, Syll. 



Alg. 2; 1326. 1894. 

 My specimens of this very large diatom have more evidently radial markings tlian 



the above figure. 



. Found at stations 2919, 2923, off southern California. 



Hemidiscus ventricosus (Castr.) Mann. 



Euodia ventricosa Castr. Rej). Voy., Chalb Bot. 2: 150. pi 12. f. 5. 1886. De Toni, 



Syll. Alg. 2: 1326. 1894. 



There is a possible doubt about this being more than a large and delicately marked 

 variety of 11. caneifovmis Wall. But after comparing my specimens with those of 

 that species from several localities I have found the contrast too wide to admit of 

 making them synonymous. 



Found at station 2920II, Hawaiian Islands. 



RUTILAKIA Grev, 



Rulilana Grev. Quart. Journ. Micr. Sci. u. s. 3: 227. pi 9. f. 1-3, 1863. Grev. 

 Trans. Micr. Soc. Lond. n. s. 14: 124. pZ. //. /. 9-12. 1866. Cleve, Bih. Sv. 

 Vet. Akad. Handl. 18': 19. 1881 (ex(4usiveof B. rccen.^(deve). De Toni, Syll. Alg. 

 2: 1020. 1894. Van Ileur. Treat. Diat. 433./. 136. 1896. 



The attempt to see a relationship l>etween this gonus and Xitzschia, as suggested 

 by Greville, or between it and Melosira^ as suggested by II. L. Smith, or between it 

 and Cymatosira, mentioned in that view by CUrve, appear all of them rather far- 

 fetched. 



■ 



Rutilaria epsilon (Ivitton) Grev. Quart. Journ. Micr. Sci. n. s. 3: 228. pi 9./. 1. 

 18t:3. Moeb. Diat.-taf. pi. 47. f. 1. 1890. Gr. & St. Journ. Quek. Micr, Club IT 

 3: 74 pi G.f. 13. 1887. De Toni, Syll. Alg. 2: 102L 1894. Temp. & Brun, 

 Mem, Soc. Phys. et Hist. Nat. Geneva 31^: 55. pi l.f. 12. 1891. 



Nitzschia epsilon Kitton, Quart, Journ. Micr. Sci. n. s. 3: 228. 1863, as synonym. 



Rulilana tenuicornis Grun.; Van Ileur. Synop. pL 105. f. 10. 1881. 



Rutilaria longicornis Temp. & Brun, Mem. Soc. Phys. et Hist. Nat. Geneva 31': 

 54. pi 1. /. 1. 1891, Van Ileur. Treat. Diat. 433./. 156, 1896. De Toni, Syll. 

 Alg. 2: 1021. 1894. Pant. P-eitr. Bacill. Ung. 3: pi S3,f, 478, 1893. 



Rutilaria hexagona Grun.; Van Ileur. S>iiop. pi 105, /. 8. 1881. Temp. & Brun, 

 Mom. Soc. Phys. et Hist. Nat. Geneva 31': 55. pi l.J, 2. 1891. 



oEhrenb. Mikrog. pi 33, XV2IT, f. 4. 1854. 



/ 



