.MANN DIATOMS OF THE ALBATROSS VOYAGES. 299 



the beading; a single large born, placed near the margin, one-fourth the distance 

 between one process and the other and pointing radially outward; border aa 

 and hyaline. 



Lk agth of valve, 0.063 nun.; width of valve, 0.053 nun. 



Type in the Q. S. National Museum, No. 590135, from Btation 3399H, Berinj 

 August 20, L893; 12. mi fathoms, bottom of green mud and Band. 



This minute species is essentially the same as thai figured by Schmidl and marked 

 "n. s. '.'." It is if anything more nearly circular than Schmidt's figure, h has a 

 slight resemblance to B. edwardsii Feb. in some of its broad varieties. I find it. how- 

 ever, impossible to assign it to thai Bpeciee. 



Biddulphia antediluviana Ehrenb.) Van Heur. Synop. 207. Lfi 

 Amphitetras antediluviana Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1839: 142. L841. 

 Kin/.. Bacill. L35. pi. 19. f. 8, pi 99. f. 86. 1844. Rabh. Fl. Eur. Alg. 1: 318. 

 /. 86. L864. Pritch. Hist. Lnfus. ed. 1. 858. pi. 11. f. 11-22. L861. Ehrenb. 

 Mikrog. pi. 19. f. 19, pi. 11. /. ?5a c. L854. W. Smith, Synop. Brit. Diat. 2: 

 -17. pi U.f. $18, pi 44-f. 818a. 1856. Eng. A: Pr. Pflanzenfam. l lb : 41./ 

 189G. De Toni, Syll. Alg. 2: 899. 1894. Schmidt, Atlas pi 99. f. 1-4, >, 9. 1886. 

 eratium antediluvianum Grun. in Fenzl, Eleise Nbvara Bot. 1:24. L870. Van 

 Heur. Synop. pi. 109. f. 4-5. 1881. Eng. & Pr. Pflanzenfam. l ir> : 50. /. 

 Biddulphia vesiculosa Boyer, Proc. Acad. Phila. 1900: 716. 1901. ? 

 Although this diatom is plainly a Biddulphia, it has been so long and widely re- 

 ferred to as Amphitetras antediluviana that many authors are reluctant to drop the 

 untenable generic name. Van Heurck in his plate- carries ou1 dm;, ggestion 



of making it a Triceratium; but in the text of his Synopsis, published four year- 

 later, the above name i- assigned. This is certainly its proper place, rather than 

 with Triceratium; for if that genus is to be weeded out and under the name : 

 nium to he so reconstructed as to scientifically denote a class of forms not at pi 

 assignable elsewhere it musl be freed from such manifest Biddulphia forms as this. 

 As there is room for some doubt, expressed by De Toni and others, of this species 

 being identical with Agardh's Diatoma vesiculosumb or Isthmia vesiculosa,^ I do doI 

 here adopt the specific name assigned by Boyer above, but follow the opinion of Van 

 Heurck. who in this respect agrees with Ehrenberg, Kutzing, Ralfs, and Grunow. 



Some of the figuresof this diatom, notably those by Kiitzing, Pritchard, and Wolle, 

 (those of the lasl copied from Van Heurck),^ are so unlike tin- form as to be utterly 

 misleading. 

 Found at stations 2680H, 2807, 2835, off central California to Galapagos Islands. 



Biddulphia aurita Lyng.) Breb. & God Consid. Diat. 12. 1838. W. Smith. Synop. 



Brlt.Diat.l: 49. pi. 45. /. 819 L853. .Ian. Abh. Schles. Ges. Vaterl. Cult. 1862 : 



16. pi lA.f. 9. L862 Rabh. Fl. Fur. Alg. 1: 311. L864. O'Meara, V 



Irisn Acad. W. 2: 274 pi W./.8. L875. Griff. & Henf. Micr. Diet. ed. 3. pi. 



19.J.9. L875. Schmidt, .Vilas pl.!22.f.6. L888. Van Heur. Synop. 205. pi 



98./, 4r-w. 1881-5. Wolle, Diat. N. A ■ L890. 



Diatoma auritum Lyng. Hydro Dan. L82. pi. 62./. D L819. 

 OdonteUa aurita C. Ag. Consp. Dial 56. L830-32. Kiii/.. Bacill. 137. pi 



B44. De Toni. Syl. Alg. 2. 862. L894. 

 Dentxeella aurUa Ehrenb. Mikrog. pi S5A. XXTII. /. ;. ls.~>i. Bail. Am. Journ. 



Sci. LI. 22: I. pi l.f. 16 >. L856. 



"Van Heur. Synop. 207. L885. 



t>C Ag. Syst. Alg. 7. 1824. 



cC. Ag. Consp. Crit. Dial. 55. L830-18 



('Van Iieur. Synop. pi 108 j. <•. 



