s ^ 



MAXX DIATOMS OF THE ALBATROSS VOYAGES. 257 



pL 164. f. U 0'^[cara, Proc. Roy. Irish Acad. IL 2: 261. 1875. Ratt. Rroc. 

 R.^y. Sor. Edinb. 16: 193. 1889. Grun. Dentsdir. Akad. Wic^ii 48-: 82. 1S8-L 

 Dp Toni, SylL Alg. 2: 1231. 189L 

 Coscinodiscii^' Hijmholophonis Grun. Drnksclir. Aktul. Wieii 48'-: 82. pi. 4. f, S-tL 

 18SL RuL(. ^l■()(^ Roy. Soc. Eiliiil). 16: 192. 1889. Schmidt, Atlas j^l 138, f. 

 1-5. De Toni, Syll, Alg. 2: 1230. J894. 



I include in tliiw species a large luiuibor of varieties found in the varioue; dredgings 

 and souiidings named. I am convinced that there is no reasonable ground for Orii- 

 now's C. symbolophorvs as distinguished from Roper's ohbT name C. steUaris. Gruinnv 

 acbnitt!; tluit the (Hfference is one of n lativc^ lineness of marking — too sUgbt a charader 

 for creating a n(»w species, especially wlu^n this difference is by no means striking 

 and many iTitermediate forms are obtainabh^ Rolli have the same relative conv<>x- 

 ity of valve; the same striking stellate elusier at the center; the same arrangement of 

 fine beading, nam<>]y, in fascicles whose compon(>n( rows are parallel to tlie longest 

 radial middle row. P>y thus abandoning tlie untenable distinction si'paraling these 

 two we have a sharply defined Rpeci( s, its nearest re dative being C, suhlilis Ehrenb., 

 from which it is distinguished by the stellate marking of the centtT and the absencv. 

 of minute processes next the border. The older specific names of Ehn^nberg given 

 above und(u- llie ntnv-abandoned gemis Symb()loi)hora take precedence over those of 

 Grunow and Roper, I have selected aS. pentas^ published simultaneously with S. 

 nticrolrius and S. fdras, because I havc^ found th(^ five-parted star at the center to be 

 more common tlian the rest and l^ecaupe Ehronbcrg's illustration cited above is quite 

 satisfaetory. 



Found at statir>ns 2S07, 2848, 2859, 28G0, 2919, 3346, 3361II, 3G03, 3G04. 3(i0lll, 

 3671, 1029TI, Galajjagos Islands, off Alaska peninsula, off Rritish rolumbia to sonili- 

 eru California and Bering Sea. 



Coscinodiscus pustulatus ^^lanii, sp. nov. Plate XLVlll, 1 ioure 3. 



Valve strongly and evenly convex, eovered witli large conical (not hemisi)he}ical) 

 beads, symmetrically arranged in decHissating rows, as in (\ symmeiricus Gn-v,, the? 

 largest at the cc^nter and regularly decreasijig to the bordc^r, but terminating just 

 within the border in asingh^rowof increased size; l)order broad, stout, and hyaline. 

 Th(^ iK-avy eone-shaiJcd !)eads give a lemarkabh^ brilHancy to the diatom. 



Diamc^ter of valv(^, 0.1 inm. 



Type in the U. S. Xational Museum, No. 59015(1, from statirm 3565II, Rering Sea, 

 July G, 1895; 1,866 fathoms, bottom of l>lu<" mud ooze. 



Ifvshouhl Ite here noted that what resembles a pseudoiKiduh^ near th*^ border in the 

 photOgra])h herewith reproduced is, together \vi(h tlireo flen-ks n(^ar tlie c(Mit(^r, due 

 to defects in (he nc^gative. 



Coscinodiscus radiatus Ehrenb. Pliys. A1)1k Akad. Wiss. Perl. 1839: 148. pi. ;?. /. 

 la-c (not (L). 1841; Mikrog. pL 19. f, /, pi 22 J. S, pi. SS. XIIL /. 2 (not :g*), 

 pi. .7.?. XVhJ. a, pi s:>A. XVII. f. G (doublful=/>;. 20. Lf. 27, pi 21 J. 1). 1851. 

 Priteh. llisl. Infus. ed. 4. 830. pi 1 1 . f. ,m. 40. bSGl. Schmidt, Atlas j)l 60. f. 

 S, 6", il 10^ pi fj.f. 13 (undetermined). 1878; pi 6VT. /. 8 (no name). I8RI; pi 

 lis, /. iV, !.'> (110 name). 21, 1888. >S<4unidf. Jahresb. Konim. T)(nit. ^Mec^re 2: 91. 

 pi, J. /. 34. 1874. Grun. DenkM4ir. Akad. Wien 48-; 71. pi 3.f. I-4, 7, bSS4. 

 Cleve & Moll, types no. 57, 114, f55, 1(14. 207, 211, 215, 257. Van Heur. Synoj). 

 pi 129, f. /. 1881. Gastr. Ri^). Voy.rhall. P.ot. 2: 165. pi 29, f. 2, 11, 16. 1886. 

 Ran. Proc. Roy. 80c. Edinb. 16: 514. 1889. De Toni, Syll. Alg. 2: 1244. 1894. 

 (exclude here C. rarliatus Bail. Am. J.an-n. >Sei. 42: 95. pi 2./. 14. 1842; also C. 

 radiatus \V(4sse, Pull. Acad. St. Petersb. 12: 122. pi 1 . f. 25. 1868). 

 CoscinodiscuH ca.<ipius Ehr(ail>. Phys. Ahh. Akad. Wiss. Berl. 1872: 394. >/. 12. 7. /. 

 14- 1873. 



Cosciiiodiscus horadis Ehrenb. Monatsber. Akad. AMss. P»erl. 1861: 294. 18(;2, not 

 C. horcaVis Pail. Am. Journ. Sci. 22: 3. 1856. 



