258 CONTKTBUTTONR FROM THE KATTONAL HERBARIUM, 



1 1-4, 1878. Van Hcur. Syn 



/. S, 1881. rieve & Moll, type no. 150. 

 Cosdnodisaf.s fallax Schuni. SdiiilL PliyB, Okoii. Gesell. Koiiigsb. 8: 02. pL ,1 /. 

 7^. 1867 (ci. CaHtr. Hop. Voy. riiall. lioi. 2: 1G5. pi 29. f. 2, 11, f5. 1886). 



Rattray uu'1ik1(\s luidor the alxivo rat(g(try several ivfertaux'S," wliidi are omitted 



here. ^ 



Found at stations 2807, 3604, 28ri5, Galapagos Ip]aud8, off Lower California and 



Bering Sea. 



Coscinodiscus robustus Grev. Trans. Micr. Soc. Lend, n. h. 14: ^. pi. l.f. <S. ISCG. 

 Moel>. Diat.-taf. pi 70. f. ^. 18()0. Jan. Hiat. Gaz. Expod. ;?^ 4,f, 10-11. Sclimldt, 



Atlas pi 62, f. ir>, 11 (not / i-S), 1878. Grun. Denksclir. Akad. Wien 48^: 72. 

 ]884, Tlatt. I'roe. Roy. See. Fdinh. 16: 511. 1889. De Toni, Ryll. Alg. 2: I24;L 



1894. Plate XLVIll, FiGrrM:' 4, 



Coscinodfsais subrelahfs Grun.; Schmidt, Atlas pL 65. f. (K 1881. ^^ 



Coscinodiscus marginatus Ehronl). var. Grun. Denkschr. Akad. Wien 48-: 72. 1884. 



Coschiodisciis iinlccrianus Tnian & Witt, Dial. Hayti 13. pi S.f. L 1888. 



Groville'ti figure and its reproduction cited above by Muebius are, aa Rattray ]>oints 

 ont, somewhat idealized. A variety was found at station 3^MJ9II eorreyponciing to the 

 one that Sehnn<]l ?^ considers doubtful. C. svbrelatus Grnn. is also a rather too div(T- 

 gent variety, while C. kinkcrian}is Truan & Witt is either a variety with unusually 

 narrow margin or a type form with n:iargin wanting. Tlic confusion between this 

 species and C\ marginatus Ehrenb. liarf been diseuased under that heading. 



Found at stations 3346, 33G1H, 3399II, 3604, 3GG3II, 3693II, 3784, 3785, 4023H, 

 4025II, off Washington, Bering Sea and Okhotsk Sea. 



In Rattray's revisiunf occurs this paragra})h: '^In a Rani a Monica form, 13 mm. in 

 diameter, discovert^d by Doctor Rae, llie usual striattnl border was surrounded by a 

 second mor(^ sharply defined but narn>w(M- l>and, with a slightly convex surface, and 

 bearing delicate striae, 8 to 10 in O.Ol nun. At one place this band is iiiterrupted and 

 somewhat more convex on tlu^ t^^o sides of tlie break. This gives it the appi^arance 

 of an ehistie spring enveloping the valve.'' Specimens of this structure are not 

 infrequent at slati(tn 8361II, which is in Bering Sea northwi'st from Pribih>f Islands, 

 At station 402oII, a little north of I he Ahnitian Islands, it is decidedly abundant. 

 'N^or is such a ban<l confin(Hl to this species. lirun^ figures precisely this conditifm 

 on a specimen of (\ crassifs Bail. It would be interesting to know the precise 

 physiological signification of this feature, its only occasional presence in the different 

 specit^s inijjlying that it has such signi(ieation. Figures of this form and a morplio- 

 logical discussic^'^. ui tlie interrupttnl diatom girdle have been published by Pahner & 

 Keeley.^ The form found at station 4025II is represented in the accompanying 

 figure. 



Coscinodiscus simbirskianus Grun. Denkschr. Akad. ^\'i('n 48": 81. 1884. Schmidt, 

 Atlas ;>/. 7/-?. /. 71-12. 1888. Ratt. Proc. Roy. Soc. Edinb. 16: 489. 1889. De 

 Toni, Syll. Alg. 2: 1228. 1894. 



My specimen is a typical example of this unusual spc^cies. As the sounding in 

 w^hieli it oet.'umKi was made off the coast of Alaska, and as 1h(> only places heretofore 



a Ehrenb. Mikrog. j^l SS. XIII. f. ^*. Schmidt, Atlas pL 62, f. IS. 1878. II. D. 

 Smith, Sp. Diat. Tyj). no. 99. Tliis last is probably an error. No. 99 is marked 

 C. ficintlllans Grev., and contains no examj^le of C. radlalns. No. 98 is marked C. 

 radtalas Ehrc:nb., but is wrong. It is C. iiodullfer Schmidt. 



^ Schmidt, Atlas pL 62. f. 1. 1H7H. 



cProe. Roy. Soc. Edinb. 16: 512. t889. 



f^AIem. Soc. Pliys. vi Hist. Nal. Geneva 31^; pi 20. f. -?. 1891. 



cProe. Acad. Phila. 1900: 465-479. pi 15-16. 1900. 



