:. ■ ■ - •rr. 



MANN DIATOMS OF THE ALF^ATROSS VOYAGES. 267 



Hemiptychns. This lattor waw lottkcd upon by Le Conic as sufficienlly distinct tu be 

 given to a genus of ColeoptcTa in 18G5.^ As ihis fii'st name of Elnt^nbt^rg's is valid and 

 as liis diagnosis is clear and bis type species well defincvl, namcdy, 7/. ornaLus, it must 

 replace tlie better known and far more desrriptiv(^ name invente<l l)y Deane. 



mi 



Arachnodi^cus ehrcnhcrgii Hail. JSer, Akad. W^iss. Berl. 1849: 63. 1850; Wilkes 

 XL S. Explor. Expcd. 17: 17 L IS74. \V. Smith, Synop. Brit. Diat. 1: 26, pi SL 

 J. 2r>Cu 1853. Schmidt, Atlas fl, GS,f. 3-4. Jan. Abb. Schlcs. Ges. Vaterh Cult. 



/ 



/ 



Ararhnoidiscus japonicus Khrenl>. Phys. Ahb. Akad. Wiss. Berl. 1872: 198. 1873 

 (not A. japonic^fs Sliadb. which is A. ornat)!^ I'direnb.). Carp. Micro, ed. 8. 612. 

 pi 12.1901. 



The specimens found Lit station 3604 are the variety called califorvira Grun.^ 

 Found at stations 2287II, 2844, 284S, 2860, 3601, 363511, 369111, 3(i()3ir, 3694H, 371211, 



3784II, 4013H, 401911, 402311, 4025II, 402911, r>oring S<'a, Aleutian Islands, off Britisli 



Colnml>ia, Okhotsk Sea, and (tff Honshu Island, Japan, 



n 



Heniiptychus indicus (Ebrenb.) Mann. 



Arachnoidiscuii indicus VAivrn]). Ber. Akad. Wiss. Berl. 1854: 105. 1855; Mikrog. 

 plS6J\34.1^b4, Will. Y(Th. Russ. Mill. Gesell. IT. 22: 153. pi 8. f. ^. 1886. 

 Pant. Beilr. Bacill. T'ng. 1: 69. pi lU.J. /;/. 1886. Schmidt, Atlas >>7. GS. /. G-S. 

 1881; pi 7.5./. 2. 1S82; pi 20Lf, 2-6, 1896. De Toni, Syll. Alg. 2: 1312. 1894. 



This species approaches by close gradations to //. chrenbergii. 



Found at station 363511, Bering Sea, betwiM'u Prihilof and Aleutian Islands. 



■ 



Heniiptychus ornatus Flin^d). Ber. Akad. Wiss. Berl. 1848: 7. 1849. 



irachnoidiscus ornalns Ebn^nb. Ber. Aka<1. Wiss. Berl. 1849: 64. 1850. Pritch. Hist. 



Tnfus. (h1. 3. 842. pi !.'>./. 18-21. 1861. Schmidt, Atlas pi 73. f. 4-10. 1882. 



Tnian & Witt, Diat. Ilayti 11. jd. 2. J. 15. 1888. Jan. Abh. Schles. Ges. Vaterl. 



Cult. 1862^: 22. ;)/. lA.f. 3, pi lB.f. r>. 1S62. De Toni, Syll. Alg. 2: 1311. 1894, 



II. B. Smith, Sp. DIat. Typ. 45. 1874. Eng. & Vr. Pflanzenfam. l^'n 69./. .95. 1896. 

 Arachnoidiscus japonlrua Shadb. Trans. Micr. Soc. Bond. 3: 3J9. pi 24- f- 18-21. 



1852 (not A. japoniciis Ehrenb., wluch is A. (hrcnbergii Bail.). 

 Arachnoidisats nicoharicns Ehrenb. Ber. Akad, Wiss, Berl. 1854: 165. 1855; Mikrog. 



plSOj. 35. 1854. 



Found at station 3698, off Honshu Island, Japan. ■ 



STICTODISCUS Grev. 



r 



Stktodl^vusGrGW Trans. Micr. Soc. Bond. n. s. 9: 39. pl4j^ 14- 1861. Truan & 

 Witt, Diat. IlayLi 18. pi 5, 1888. De Toui, Syll. Alg. 2: l:M3. 1874. Castr. 

 Rep. Voy. ChalL Hot. 2: 112-116. 18S6. Van Tleur. Treat, Dial. 506./. 254. 1S96. 



Cydoiilla KiU/. Sp. Alg. 20. 1849, in jjarl. 



TricvniUuni Ehrenb. in jiart ; (Jrev. Trans. MI<t. Soc. Bond. n. s. 9: 76, pi fL 

 f. U. 1S61; 13: 104. pi S. f, 14. 1865. 



Dlscoplra Ehrenb. ^fikrog. pi .H5A. XXJl.f. (L 1854, in part. 



AcfinnptT/rhus Ehrenl>. Mikrog. pi lU.J. 12. 1854, in part. 



Nothoccmtiiun De Toni, Syll. Alg. 2: 915. 1894, in part. 



All specimens of this genus having polygonal instt^ad of circular form were put by 

 * Greville arid others in that uns< lentific comph»x, the genus Trit eratiuni of Ehrenberg. 



«rroo. Acad. Phila. 239. 1865. 

 ?> Schmidt, Atlas pt. GS.f. 3. 1881 



