248 CONTRIBUTIONS PROM l III NATIONAL HERBARIUM. 



nodiawia boreatis Bail. Amer. Journ. Sci. II. 92: 3. 1856. Pritch. lli-i. [nfus. 

 -.1. t B38 i86i. H. L. Smith, Sp. Diat.Typ.no. I 1874 Rati P 



Roy. 8 I linb. 16: 558. L889. Schmidt, Atlas, pi. 63. De Toni, 



Syll. Ug. 2: 1274. 1894. 



I hrenb. var.; Cleve, in Nordensk. Vega Exped. '3. 

 1883. Ghrun. Denkschr. Akad. Wien 48-: 77. 1884. 

 Bail • mbl< s C. <x ' w- Idis; bul th<- < ellulee forming the star are 



rounded, and the other cellules are larger." Rattray says, "Distinguished bom 

 ' user and more robusl markings." The species is neverthe- 



doubtful worth; and Cleve and Grunow have perhaps done rightly in classing 

 : variety of C. Idis. Ehrenberg* 1 gave the name to a < ] 1 1 i i < - different 



diatom, a variety of his C. radiatxu. 

 Pound al stations 2844, 3607, 3361H, Aleutian [elands and Bering S 



Coscinodiscus centralis Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1838: 129. L84 

 Ber. Akad. WisB. Berl. 1844: 7s. L845; Mikrog. L8./. 39, pi. It./, i. (nol pi 

 ./'... . L854. Pritch. Bist. Enfus. ed. 1. 828. 1838. Greg. Trans. Roy. See. Edinb. 

 21: 501. pi. 11. f. ■■'. L857. Van Beur. Synop. pi. 103. / /:. L881. II. I.. Smith, 

 Sp. Diat. Typ. no. 91, 92. L874. Cleve A M611. type no. 57, 164,207,215. Oastr. 

 Rep. Voy. Chall. Bot. 2: L55. pi. .'../". 3. L886. Ratt. Proc. Roy. - c Edinb. 

 16: 555. L889. De Toni, Syll. Alg. 2: L272. L894. 



asUromphalus Ehrenb. var.; (inm. Denkschr. Akad. Wien 48-: 7'.». 

 L884. 



Tin- Bpecies is, like the two preceding ones, too close in Borne of it- varieties t" ( . 

 < Ehrenb. In fact . we have here to do with a group of forms thai run into 

 Miu- another and render the >j>e.-iiie boundaries unsusceptible of sharp definition. 



A figure in Schmidt's Atlas h represents the more common variety in the following 

 dredging. 



Grunow does no1 recognize this as belonging i<> the presenl Bpecies; but I think 

 with Schmidt it should be classed here. 



Many figures of this Bpecies are worse than worthless, notably that by < t'Meara. r 



Pound at Station 2807, Galapagos fslands. 



Coscinodiscus cocconeiforniis Schmidt. Atlas pi. 58. /. : 18. L878. Ratt. Proc. 



Roy. Soc. Edinb. 16:599. L889. De Toni, Syll. Alg. 2: L302. L894. Wolle, Diat. 



\. A. pi . L890. 



The forms found in the following dredging are larger than those figured l»y Schmidt. 



and the dots radiate regularly from the elliptical center, a variation wider than the 



inconsequential ones Bhown in Schmidt's figures, to which Rattray gives three vari- 



i tal names. 



Found at Btation 2807, Galapagos fslands. 



Coscinodiscus concavus I'.hrenh. Greg. Trans. Roy. Sue. Edinb. 21: 500. pi. 10./. 

 L857. Cleve, Bih. Sv. Vet. Akad. Handl. 1": I. L873. Ehrenb. Phys. Abh. 

 Akad. Wiss. Berlin 1841: Ml'. 1843; Ber. Akad. Wiss. Berl. 1844: 78. L845; 

 Mikrog. pi 21./. I (nol pi. 18. ./'. 38 . 1854; Phys. Abh. Akad. Wiss. Berlin 

 1871: 260. L873. Sclnui.lt. Atlas, pi. 6ft./. 8 not pi 59./. 16 . L878. Km/. Sp. 

 Alg. 125. L849. Ratt. Proc. Roy. Soc. Edinb. 16: 469. L889. D< Toni, Syll. Alg. 

 2: 1215. L894. 



nodiscu8wconcavit3 a/riccu Ehrenb^ Ber. Akad. Wiss. Berl. 1844: 7!'. L845. 



B< r. Akad. Wiss. Berlin 1861: 294. L8 

 ''Schmidt. Atlas pi. 60./. It. 1* 3 

 'Pro.. Roy. Irish Acad. II. 2: pi. 16./. 19. 1875. 



