256 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Coscinodiscus obscurus Scliniidt, Atlati pi Gl. f. 1(> IS. I87S. Gnm. Dt^nksr-nr. 

 Akiid. Wicii 48-: 74. 1881. Rati, Troc. Uoy. Sue. Ediiib. 16: 5i;5. 1889. ])e 

 Toni, Syll. Alg. 2: 1244. IS94. 

 Ccstorliscvs obscurus Y'dU Hour. Synop. /)?. i;i?,'y./. ■^. 1S8I. 



The general cell structure of my specimens agrees well willi I lie above, ami tlie 

 cliaraoterLstic minute beads at tlie inner ends of the semiradial lines are very evident. 

 They do not appear in the somewhat doubtful phutograpli of this diatom by Doctor 

 Woodward. o The specimen from Sendai, Japan, called by 15mn C. ohscurns JJoralis'J' 

 can hardly be cla.=!sed here; the fine b(;aded aecondary uiarkiiigs in the hexagons and 

 the absence of a striated border mark Hhmu as distinct. Rrun's form is, except for the 

 coarser marking, nearer to C. fniidiilits RchmidI, which, like the above, has niiiuite 

 beads at the terminations of the semiradial lines. 



Found at station 2844, south of Alaska. 



Coscinodiscus oculus-iridis Ehrenb. Pliys. Abh. Akad. Wiss. Berl. 1839: 147. 1841; 

 Mikrog. pi. IS./. 4~', pl- iO. f. 2. 1854. Jan. Abh. Rchles. Ges. Vaterl. (^dt. 1863-; 

 3. pl. IB. J. Ck pl 2A.f. 4. 18G2. Schmidt, Atlas pl GS.f. ■', (no name), C>-9. 1878; 

 pl US.f. /, 3-5, 20. 1SS8. Grun. Deukschr, Akad. Wien 48-*: 77. 1884. Jan. 

 Diat. Gaz. Exped. pl 2.f. 2. Cleve & Moll, type no. 3, 57, 102, 215, 258, 259, 276. 

 319. Ilatt. Proc. Roy. Soc. Edinb. 16: 559. 1889. Pritch. Hist. Infus. ed. 4. 828. 



18G1. De Toni, Syll. Alg. 2: 1275. 1894. 



/. S. XL L. Smith, Sp. Diat. Typ. no. 



91 (not no. 92). 1874. 



Rattray unites with the above list C. umpltalanllais Grun., <■ C. aHlcrompliahisYAirvnh.,'^ 

 and Cestodiscus radiatns Ehrenb. e T do ncjt think these can be classed here. I al.-^o 

 look on Rattray's C. ooilus-iridu loculifcru / na of doubtful worth. 



Found at stations 2929, 3(>04, 4530H, off southern California and Rering Sea. 



Coscinodiscus pentas (Ehrenb.) Mann. 

 SymboJophora pcnlas Ehrenb. Rer. Akad. Wiss. Rerl. 1844: 205. 1845; Mikrog. pl 



35A. XXII.'f. lit. 1854. (iriff. .1- Henf. Micr. Diet. ed. 3. pl 4S. f. r>G. 1875. 



Ehrenb. Phys. Abh. Akad. Wi.ss, Rerl. 1872: 283. pl 12. Jl.f. 1. 1873. 

 Syiiihulopliora'vucrolrian Ehrenb. Rer. Akad. Wiss. Rerl. 1844: 205. 1845; .Mikrog. 



pl .l^A, 21. f. IG. 1854. Pritch, Hist. Infus. ed. 4. 833. 18(;i. Griff. &. Henf. 



Micr. Diet. ed. 3. pl 43. f. i>P>. 1875. 

 Sij»)h()lophoni ttUas Ehrenb. Rer. Akad. Wiss. I'mmI. 1844: 205. 1845. Fhrenb. 



Phys. Abh. .\kad. Wiss. l'.erl. 1872: 394. pl 12. II. f. 1. K^73. 

 Symbolophnra hrras Elu'enb. Rer. Akad. ^\'iss. Rerl. 1844: 205. 1845. S' 

 Coscinodiscun stdlans Roper, Quart. Journ. Micr. Sci. 6: 21. pl .?./. 3. 1858. Moeb. 



Diat.-taf. pl 13. f. 3. Pritcli. Hist. Infus. ed. 4. 828. pl r,.f. S3. 1S(,1. ('a.str. 



Rep. Yoy. ('hall. Hot. 2: 155, 158. pl 3.f. 2. pl r>.f. 9. Gr'.ve; Schmi<11, Atla.s 



a Van Ileur. Synop. pl 120. f. 4. 1881. 



h}>[om. Soc. Pliys. et Hi.st. Nat. Geneva 31': 23. pl 20. f. 2. 1891. 



c Schmidt, Atlas pl G3.f. 2. 1878. 



d Schmidt, Alias p/. 60. f. 7. 1878 and Grun. Denkschr. Akad. Wim 48': 77. 1881. 



e Van Heur. Synop. pl 129. f. ■'). 1881. 



/Proc. Roy. Soc. Edinb. 16: pl 1 . f. 2. 1889. 



dSymhoJophora miirotetras l-'lirenb., S. mia-openias Ehi'cnh., and ^9. microhexas 

 Ehrenl). Monats1)er. Akad. Wiss. Rerl. 1855: 302. 1850, are all Tiomina nuda. S. triH- 

 itatis Ehrenb. Rer. Akad. Wiss. Uerl. 1844: 88, 1845. Prilch. llisl. Infus. ed. 4. 

 833. pl 11. f. 36. 1801. Griff, .t Henf. Micr. Diet. ed. 3. pl VJ.f. G. 1875. Am. Journ. 

 Sci. 48: pl 4. /.'I. 1845 is heic excluded, as it is an Actinoplychus. 



