MWX DIATOMS OF I III. ILBATROSS VOYAGES. .'117 



Euodia gibba Bail.; Pritch. Hist. Infus. ed. 4. 852. pi. & < L861 II I Smith, 



Sp. Diat. T?p. no. 161. L874. Rabh. Fl. Eur. Alg. 1: 318. 1864. DeToni, Syll. 



Alg. 2: 1325. 1894. Van Heur. Treat. Dial ■"■.- L896. Wolle, Diat. N. 



A. pi 68. f. 16. L890. 



Dichomeris subtilis Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1861: 294. L862; 1872: 



265. pi 373. 



Euodia inornata Castr. Rep. Voy. Chall. Bot. 2: L49. pi. /'../'. /. L88 

 The lasl name above is doubtful. It agrees very closely with Wallich's figure, but 

 is a larger diatom with finer markings. I do nol include here Ehrenberg's Gonio- 

 thecium annul us." Though plainly a member of this genus, ii is uol easily united with 

 this Bpecies.6 h i- evidently a very coarsely marked form. Babirshaw, though 

 placing it with the al ove, questions it. Without an accurate description, which it 

 huk~. I consider it- union here somewhat arbitrary and illustrative of the tendency 

 mentioned al ove, to blend all similar forms with the original species of Wallich. 

 Hemidiscus rectus Castr. Maim. 



Euodia recta Castr Rep. Voy. Chall. Bot. 2: 1 19. pi 12. f. 8. 1886. De Toni, Syll. 



Alg. 2: L326. L894. 

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

 the above figure. 



Found at stations 2919, 2923, off southern California. 

 Hemidiscus ventricosus (Castr. Maim. 



dia ventricosa Castr. Rep. Voy. Chall. Bot. 2: L50. pi 12. f. 5. L886. DeToni, 

 Syll. Alg. 2: L326. L894. 

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

 variety of //. cuneiformis Wall. r>ut after comparing my specimens with tl. 

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

 making them synonymous. 



Found at station 2920H, Hawaiian Islands. 



RUTILARIA Grev. 



Rutilaria Grev. Quart. Journ. Micr. Sci. n. s. 3: 227. pi. 9. f. 1 ... L863. Grev. 

 Trans. Micr. Soc. Lond. n. s. 14: V24.pl 11. f. 9 12. L866. Cleve, Bih. Sv. 

 Vet. Akad. Bandl. 18': L9. L881 (exclusiveof R. recensCleve . DeToni, Syll. Alg. 

 2: 1020. 1894. Van Beur. Treat. Dial. 433./. L36. LS 

 The attempt to see a relationship between this genus and Nitzschia, as suggested 

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

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

 fetched. 



Rutilaria epsilon Kitton) Grev. Quart. Journ. Micr. Sci. n. b. 3: 228. pi 9.J. l. 

 is:;. Moeb. Diat.-taf . pi 47. f. 1. L890. Gr. & St. Journ. Quek. Micr. Club II. 

 3: 74 pi 6.J. is. L887. De Toni, Syll. Alg. 2: L021. L894. Temp. & Brun, 

 Mem. Sue. Phys. et Bist. Nat. Geneva 31 : 55. pi l.f. 12. L891. 

 Nitzschia epsilon Kitton, Quart. Journ. Micr. Sci. n. b. 3: i"_ )s v 1863, as synonym. 

 Rutilaria tenuicornis Grun.; Van Beur. Synop. pi. 105. f. 10. l ss l. 



Rutilaria hum'" - Temp. & Brun, Mem. Soc. Phys ■ Bist Nat. Geneva 31 : 



54. pi l.f. i. L891. Van Beur. Treat. Diat. 133./. 156. L896. De Toni, Syll. 

 Alg. 2: L021. L894. Pant. Beitr. Bacill. Ung. 3: pi - L893. 



Rutilaria hexagona Grun.; Van Hem-. Synop. pi 105. f. 8. I ss l. Temp. & Brun, 

 Mem. Soc. Phys. et Bist. Nat. Geneva 31': 55. pi l.f. :. L891. 



a Ehrenb. Mikrog. pi ■■■'•. Will. f. .. L854. 



Mf. <,mf. & Benf. Micr. Diet. ed. 3. 347, pi -. L875. 



