

MANN DIATOMS OF THE ALBATEOSS VOYAGES. 281 



X 



ipodiscus radiosus (Gr. & St.) Mann. 

 Aalacodiscus radiosiisGr, & St. Jouni. Qiiek. Mier. Club II. 3: 140. pL 12, f. 3S. 1887. 

 Schmidt, Atlas j)l. 157, f. 1, 1890. Ratt. Journ. Hoy, Micr, Soc. 81:350. 1888. 

 De Toni, Syll. Alg. 2: 1 101. 1894. De Toni, Notarisi?. 4G6. 1888. 



The origmal figure cited above is so bad as to mislead identification ; but the deacrip- 

 Lion is clear; it agrees well with Schmidt's illustration. It is a diatom of exceptional 

 beauty- 

 Found at station 2808, Galapagos Inlands. 



Tripodiscus rogersii (BaiL) Mann. 



Podiscus rogcrsii Bail. Am. Journ. Sci. 46: i:?7. pL S.f, 1-2. 1844. Ehrenb. Ber. 

 Akad. Wiss. Berh 1844: 81. 1845. 



Eupodiscus rogersil Ehrenb. Ber. Akad. Wiss. Berl. 1844: 81 . 1845. Schmidt, Atlas 

 pi 92, f. 5-6. ]886. 



Eupodiscus hailcyi Ehrenb. Ber. Akad. Wiss. Berl. 1844: 81. 1845. 



Aulacodiscus rogersii Schmidt, Atlas pi. 107. f. 3. 1886. Ratt. Journ. Roy. Micr. 



Soc. 8^' 372. 1888. De Toni, Syll. Alg. 3: 112L 1894. 

 Ai'lacodiscus areolatus OMeara, Quart. Journ. Micr. Sci. n. s, 18: 104. 1878. 



Aulacodiscus thumii Schmidt, Atlas pi 102, / 8. 1886. Katt, Journ. Roy. Micr. Soc 

 8': 374. 1888. 



The above enumerated diatoms are close to T, argus, and form with it a group son:e- 

 what distinct from other members of the genus, especially in tlie matter of the double 

 marked areolation. 



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



Tripodiscus scaber (Ralfs) Mann. 



Avlacodisciis scaber Ralfs in Pritch. Hist. Infus. ed. 4. 844. 1861. Schmidt, Atlas 

 pi SS.f, 4-8. 1870. Ratt, Journ. Roy. Micr. Soc. 8': 353. 1888. 



Aidacodiscus crux Ehrenb. in part; Ilab. Cat. 57. 1877. Jan. Abh, Schles. Ges. 

 Vaterl. Cult. 1861^: IGl. pi 2 J. 1-3. 1861; 1862-': pi lA.f. 12. 1862. 



Aulacodiscus lernatus Jan, Abh. Scliles. Ges.Vatorl. Cult, 1861-': IGl. pi 2,f. 4. 1861. 



Aulacodiscus bevveriae Johnst.? Pritch. Hist. Infus. ed. 4. 844. pi G. f, 5, 1861. 

 Schmidt, Atlas pi SG.f. 12. 1876. 



There is a possibh^ doubt about the last-named synonym, tliough I do not see how 

 it can be maintained as the name of aseparalc species. Strictly type forms of 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 (Br. & Temp.) Mann. 



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

 21. j)l 4 J. S. 1889. Schmidt, Atlas pi 169.f,''8, 9. 1892. De Toni, Syll. Alg. 2: 

 1106. 1894. 



4- 



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

 Schmidt's figurc\s, but these and my form are somewhat different from the type as 

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

 line of spines or granulations connecting the bases of the three processes. 



Found at station 4029II, Bering Sea. 



ATJLISCUS Ehrenb. 



AuUscus Ehrenb. Ber. Akad. Wiss. Berl. 1843: 270. 1844. Bail. Smithson. Contr. 

 Knowl. 7: 4. 1854. Ratt. Journ. Roy. Micr. Soc. 8': 861 900. 1888. DeToni, 

 Syll. Alg. 2: 1025. 1894. 



Mnstodiscus Bail. Smithson. Contr. Knowl. 7:4. 1854, no species given. 

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



