MANN DIATOMS OF THE ILBATROSS VOTAl 26"! 



Hemiptychus. This latter was lo >ked upon by Le Conte as sufficiently distincl to be 

 given i" a genus of < loleoptera in 1865.° Ae this firsl name of Ehrenberg's is valid and 

 as his diagnosis is clear and his type species well defined, namely, //. ornatus, il musl 

 replace the better known and far more descriptive name invented by Deane. 



Hemiptychus ehrenbergii Bail. Maim. 



Arachnodiscus ehrenbergii Bail. Ber. Akad. Wiss. Berl. 1849: 63. L850'; Wilkes 

 I S. Explor. Exped. 17: 17 1. L874. W. Smith, Synop. Brit. Diat. 1: 26. pi SI. 

 f.256. 1853. Schmidt, Atla Jan. Abh. Schles. Ges. Vaterl. Cult. 



1862 : 158. pi 2A.f. S. U. L862. Pant. Beitr. Bacill. Ung. 1: 69. pi 19. f. 169. 

 L886. Truan & Witt, Diat. Bayti, pi /../". 3. L888. 

 Arachnoidiscus japonicus Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1872: L98. L873 

 (nol A. japonicus Shadb. which is A.ornatus Ehrei p. Micro, ed. 8. 612. 



pi 12. 11)01. 

 The specimens found at station 3604 are the variety called californica Grun.6 

 Found at stations 2287H, 2844, 2848, 2860, 3604, 3635H, 3691H, 3693H, 3694H, 3712H, 

 3784H, 1013H, W19H, 1023H, W25H, 1029H, Bering Sea, Aleutian Islands, off British 

 Columbia, Okhotsk Sea, and off Honshu Island, Japan. 



Hemiptychus indicus Ehrenb. Mann. 



Arachnoidiscus indicus Ehrenb. Ber. Akad. Wiss. Berl. 1854: 165. L855; Mikrog. 

 pl.S6.f.S4. L854. Witt. Verh. Russ. Min. Gesell. II. 22: L53. pi 8. f. 4. L886. 

 Pant. Beitr. Bacill. Ung. 1:69. pi 19. f. 171. L886. Schmidt. Atlas pi 68. f 

 L881; pi :•../'. 2. L882; pi 201. f. 2-6. L896. De Toni, Syll. Alg. 2: 1312. 1894. 



This species approaches by close gradal ions to //. ehn rib* rgii. 



Found at station 3635H, Bering Sea, between Pribilofand Aleutian Islands. 



Hemiptychus ornatus Ehrenb. Ber. Akad. Wiss. Berl. 1848: 7. L849. 



1 actmoidiscus ornatus Ebrenb. Ber. Akad. Wiss. Berl. 1849: 64. 1850. Pritch. Hist. 



[nfus. ed. :'». 842. pi 15. f. 18-21. 1861. Schmidt, Atlas pi 78. f. :-!>>. L882. 



Truan A: Witt. Diat. Ilayt'i 11. pi 2.f. 15. 1888. Jan. Abh. Schles. Gee. Vaterl. 



('nil. 1862 2 :22. pi lA.f.8,pl. lB.f.5. L862. De Toni, Syll. Alg. 2: L311. L894. 



II. L. Smith, Sp. Diat.Typ. 45. L874. Eng. & Pr. Pflanzenfam. l lb : 69./. 95. L896. 

 Arachnoidisciis japonicus Shadb. Trans. Micr. Soc. Lond. 3: 319. pi 24. f. 



L852 (no1 A. japonicus Ehrenb., which is .1. ehrenbergii Bail.). 

 Arachnoidisciis nicobaricus Ehrenb. Ber. Akad. Wiss. Berl. 1854: L65. L855; Mikr>u r . 



pi SO. f. S5. 1854. 

 Found at station 3698, off Honshu Island. Japan. 



STICTODISCTJS Grev. 



Stictodiscus Grev. Trans. Micr. Soc. Lond. n. b. 9: 39. pi L861. Truan & 



Win. Dial. Bayti L8. pi 5. 1888. De Toni, Syll. Alg. 2: L313. 1874. Castr. 

 Elep. Voy. Chall. Bot. 2: Ml' L16.1886! Van Heur. Treat. Diat. 506./. 254. 



Cyclotella Kin/. Sp. Alg. 20. L849, in pan. 



Triceratium Ehrenb. in pari : Grev. Trans. Micr. Sue. Lond. a. b. 9: 7»'>. pi 9. 

 f. 9. L861; 13: L04. pi >../'. /.. L865. 



Discoplea Ehrenb. Mikrog. pi S5A. XXII. i'. 6. L854, in part. 



Actinoptychus Ehrenb. Mikrog. pi 19. f. 12. 1854, in pari. 



Nothoceratium De Toni, Syll. Alg. 2: 915. L894, in pari. 



All specimens of this genus having polygonal instead <>t" circular form w< re put by 

 Grevilleand others in thai unscientific complex, the genus Triceratium «>f Ehrenberg. 



Proc. "Lead. Phila. 239. L865. 

 b Schmidt, Atla- p*. 68. /'. S. L881. 



