M\N.\ DIATOMS OF THE ALBATROSS VOYAGES. 281 



"ipodiscus radiosus (Gr. & St.) Mann. 

 Aulacodiscus radio8usGr.& St. Journ. Quek. Micr. Club [I. 3: 140. pi. 12. f. ■■. 1887 

 Schmidt, Atlas pi 157. f. 1. L890. Ratt. Journ. Roy. Micr. Soc. 8': 350. 1888. 

 De Toni, Syll. Alg. 2: L101. L894. De Toni, Notarisis 166. 1888. 

 The original figure cited above is bo bad as to mislead identification; but the desi rip 

 lion is clear; ii agrees well with Schmidt's illustration. 1 1 ie a diatom of exceptional 

 beauty. 

 Found at station 2808, Galapagos Hands. 



Tripodiscus rogersii (Bail.) Mann. 



Podiscu8 rogersii Bail. Am. Journ. Sci. 46: L37. pl.S.f. I '. 1844. Ehrenb. Ber. 



Akad. Wiss. Berl. 1844: 81. L845. 

 Eupodiscus rogersii Ehrenb. Ber. Akad. Wiss. Berl. 1844: 81. l s i">. Schmidt, Atlas 



pi 92. f. 5 6. L886. 

 Eupodiscus baileyi Ehrenb. Ber. Akad. Wiss. Berl. 1844: 81. L845. 

 Aulacodiscus rogersii Schmidt, Atlas pi, 107. f. 3. L886. Ratt. Journ. Roy. Micr. 



Soc. 8': 372. isss. I),. Toni, Syll. Alg. 2: 1121. L894. 

 Av lacodiscus areolatus O'Meara, Quart. Journ. Micr. Sci. n. b. 18: L04. L878. 

 Aulacodiscus thumii Schmidt, Atlas pi!. 102. f. 8. L886. Ratt. Journ. Roy. Micr. Soc. 



8': 374. 1888. 

 The above enumerated diatom- arc close to '/'. argus, and form with it a group some- 

 what distinct from other mem hers of the genus, especially iii the matter of the double 

 marked areola! ion. 



Found at stations 2823, 2835, Gulf of California and off Lower California. 



Tripodiscus scaber | Kail's) Mann. 



Aulacodiscus scaber Ralfs in Pritch. Hist . [nfus. ed. 4.844. L861. Schmidt, Atlas 



l>i. 33. f. ; 8. L876. Ratt. Journ. Roy. Micr. Soc. 8 1 : 353. L888. 

 Aulacodiscus crux Ehrenb. in part; Bab. Cat. 57. h s 77. Jan. A Mi. Schles. Gee 



Yaterl. Cult. 1861 J : L61. pi. 2.f. I 3. L861 ; 1862 J : pi. lA.f. 12. L862. 

 Aulacodiscus tematus Jan. Abh. Schles. Ges.Vaterl. Cult. 1861-': L61. pi. .'../". ,. L861. 

 Aulacodiscus beeverixn Johnst.? Pritch. Hist. [nfus. ed. 4. 844. pi. 6. f. 5. L861. 



Schmidt. Atlas pi 36. f. 12. L876. 

 There is a possible doubl about the last-named synonym, though I do nol Bee how 

 it can be maintained as the name of aseparate species. Strictl) type formsof the 

 present species occur in the latter of the two stations following. 



Found at stations 2807, 2835, Galapagos Islands and off Lower California. 



Tripodiscus tripartitus I Br. & Temp. I Mann. 



Aulacodiscus tripartitus Br. & Temp. Mem. Soc. Phys. et. Hist. Nat. Geneva 30'': 

 21. pi ;../'. 3. 1889. Schmidt. Atlas pi 169. f. 8, 9. L892. De Toni. Syll. Alg. 2: 

 L106. IS!) I. 

 1 assign my specimen to this species with considerable doubt. It agrees well with 

 Schmidt's figures, bul these and my form are somewhal differenl from the typo as 

 described and figured by its authors, especially in the absence of the inner triangular 

 line of spines or granulal ions connecting the bases of the three processes. 

 Found at station 4029H, Bering Sea. 



AULISCUS Ehrenb. 



Auliscus Ehrenb.Ber. Akad. Wiss. Berl. 1843: 270. L844. Bail. Smithson. Contr. 

 Knov.l. 7: !. 1854. Ratt. Journ. Roy. Micr. Soc. 8 2 : 861 900. L888. ho Tom. 

 Syll. Ug. 2: L025. L894. 

 Mastodiscus Bail. Smithson. Contr. Know). 7: l. 1854, no species given. 

 Coscinodiscus Ehrenb. Her. Akad. Wiss. Berl. 1843: 271. 1844, in part. 



