t 





MANIS'— DIATOMS OF THK ATJiATROSS VOyA<iK8. 205 



Crnspedodiscus coscinodiscus I^lironl). licr. Akad. Wiss. Bfil. 1844: 1!<>(I. 1845; 



Mikrog. pi. 18. f. J(KS\pI..U, XV. f. S.pl.S.l, ^Vl-f- <^- 1854. rritcli. TTist. Tiifus. 



od. 4. 832. pJ. o./ S(K ISGL O^Mram, rroc. Roy. Irish Acad. IL 2: 2^0. pi. 26. J. 



2i\. 1871. Schmidt, Alias pi. 66./. .i-r,. 1881; pL 18-1 f. 4- 1803. Bright. Quart. 



Jourii. Micr, Sci. 8: ^>5, 130. pi. .5. /". 4- 18(J(), corriH'tion. rinin. in Fonzl, Reise 



Novara Rot. 1: 2(>. 101. LS70. Ratt. IVoc. Rov. Soc. Edinl). 16: mi). 188D. De 



ToTii, Syll. Alg. 2: 1109. 1801. \\iA\y\ Dial. X. A. pi. 86. f. 3. 8. 1800. 

 Fyxulunda coscinodlsrih^ Klirmh. V>yr. Akad. Wiss. Rcrl. 1844; 85. 1845. 

 CrnspalodirSCfis viirrodisnis l-^hrcnl). Mikrou^. pi. ri.i. XVII. f. ^ 1854. 

 Cr<i^pt(l(}(lhvus pij.ndicida Rrighl. Quart. Jnurn. Micr. Sfi. 8: 05. y>/, .7. /. -^. 18(iO. 



.M(K'l). Diat.-taf. pi. J8. f. 4. 1800. 

 Cosclnudhviin pijxidiada Kiifz. Si). Alg. VIW. 1810. GiitT. & ilvul, Micr. Diet. od. 3. 



pL 4S.f. 2L 1875, 



Fuujid at station 2910. <fiT snuthorn ( -alifnrnia. 



CYCLOTELL.A Breb. 



Cydoldla^ Jireh. in lircl). & Gud, Gonsid. Diak 20. 1838. KiUz. Racill. 50. 1844. 



Arnott, Quart, Jouru. Micr. Sci. 8; 244. 1800. Van Hour, Syuop. 213. Pritch. 



Hist. lufus. od.4. 811. 1801. Tastr. Rep. Voy. Ghall. But. 2: 140. 1880. De Toni, 



Svll. Al- 2: 1351. ISOl. 

 Cijmhdla (k Ag. Consp. Dial. 11. 1830, in j)art. 

 Ptjndinda Flirenb. Infus. pL 10. f. 1. 1838, in part. 

 Dimrpha Ehrenb. Bct. Akad. \\iss, Rerl. 1847: 484. 1848; Mikrog. pi. 6. II f, 1-4, 



pi. 39. 11. f. 29. 1854. 



In many instances singh^ valves of thisg(^nus are ich^ntical in general build M'ith thu.s(i 

 of Melosira C. Ag. ThtA" ne\'er, however, grow in conruH'led chains or Olament.^, as dn 

 those of the latter genus. Their sculpturing is also usually sui generis. The genus is 

 universally recognized as distinct, a <leeided advantage in classiiicati(tn, in view of tin; 

 size of Molosira. Although ('yclot(41a reiueseiifs much smaller forms than those com- 

 prising the genus Coscinodiscus, llu^ general shaj>e antl the mode of growth of the two 

 are closely similar, and <'(4'taiu nu'udjcrs of (^a<4i g(Mius are difhciilt. to distinguish. 



Cyclotella regina Mann, sp. nov. Plate L, figuki-: 2. 



Valve circular; consisting of a large central area, thrc^e-fourths ihe diameter of the 

 vah'(^ and a rim one-fourlli the diameter; tlte former nearly liyalin^*, hut liaving a ft^w 

 scattennl beads near the slightly elevated c(Miter and a narrow fring(^ of line radiating 

 lines n<'xt to the rhu; rim nearly flat, showing different markings on its under and 

 upp(T sides; the under (section a in the (igure) ornanu^ited with delicatt* and clnse 

 trajisverse striae; the ui)per (sectittn h in the figure) finely Ix^adc d on (lie inner half, 

 tlu; outer half hyalim*; a fine Imt evi(hmt line near to and parallel willi the margin. 



DiauK^ter of valv(^ 0.088 nun. 



The general ap|>earance of this specaes is snmcwiiat lik(^ (\ lr(nisj/Iv(f)iica Pant.^ 

 Specimens are scarce at stat ion 2807, at the (lalapagos lslan<ls, and only a .single valv:^ 

 was f<mnd at station 282.3 just inside the nioulh of ijio (Julf of ('alil'nrnia. opfiositr^ the 

 towTi of ha Pax. 



Type in the V. S. National Museum, Xo. 50012:), from station 2807; alstt fntm sta- 

 tion 2823>^ Galapagos Islands and Gulf of (\difornia> 



Cyclotella striata (Ktilz.) (irun. in Cleve & Grun. Sv. Vet. Akad. Tlandl. 17^: 110 

 1880. Van lleur. Synoj). 213. /)/. 92. f. 6 KK 12 15. 1881. Schmi<lt, Atlas pi. 

 223. f. 9^14. ISOfi. D(^ Toni, Syll. Alg. 2: 1352. 1894. 

 Coscinodiscus slrialus KiUz. Hacill. 131. pL 1. f. 8. 1844. 



•^ As a subgenus by Kfitzing, kinnaea 8: 535. 1833. 

 i^ Schmidt, Atlas /j^. 223. f. 21^27. 189G. 



