■ _ ^ - 



MANN DIATOMS OF THE ALBATROSS VOYAGES, 299 



the beading; a single large horn, placed near tho margin, unu-fourth the distance 

 between one process and the other and ])(>in(ing radially ontward; l)urder narrov/ 

 and hyaline. 



Length of valve, 0.0G3 mm.; width of valve, 0.053 mm. 



Type in the U. S. National Museum, No. 590135, from station 3399H, Bering Sea, 

 Augu;st 20, 1893; 12,04] fathoms, bottom of green nuid and sand. 



This minute species is essentially the same as that figured by Schmidt and marked 

 ''n. s. ?/' It is if anything more nearly circular than Schmidt's figure. It has a 

 slight reseml.>lance to B. cdtcarchii Fel). in some of its broad varieties. I find it, liow- 

 ever, impossible to assign it to that species. 



Biddulphia antediluviana (Elirenlj.) Van Ileur. Synop. 207. 1885. 



Am ■phit etras antediluviana Elirenb. Pliys. Al)li. Akad. Wiss. li(Tl. 1839: ]42. 1811. 



KliU. Bacill. 135. j)l. 19, f. S, pi 29. f. SG. 1844. Rabli, Fl. Eur. Alg, 1: 318. 



/ 86. 18G4. Pritcli. Hist. Infus. ed. 4. 858. jpl. U. f, 21-22. 18G1. Ehrenb. 



Mikrog. pi. 19. f. 19, pi 21, f. 25a c. 1854. W. Smith, Synop. Brit. Diat. 2: 



/ 



Eng. & Pr. rflanzenfam. 1^^^; 41./ 5Sl>. 



I89G. De Toni, SylL Alg. 2: 899. 1894. Schmidt, Atlas pi 99. f, 

 Triceratlvm antediluclanwm Grun. in Fenzlj Reise Novara IJot. 1; 24. 1870. Van 



Heur. Synop. pi 109. f. 4-5. 1881. Eng. & Pr, Pflanzenfam. l^^- 50. /. GO. 189G. 

 Biddulphia vesiculosa Boyer, Proe, Acad. IMiila. 1900: 716. 1901. ? 



Although this diatom is plainly a Biddulphia, it haw been so long and Avidely re- 

 ferred to as Amphitetras antediluviana that many authors are r{4uctant to drop the 

 imienable generic name. Van Ileurck in his plates carries out Grunow's suggestion 

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

 later, the above name is assigned.'^ This is certainly its proper place, rather tliau 

 witli Triceratium; for if that genus is to he \v(^edcd out and under the name Trigo- 

 nium to be so reconstructed as to scientifically denote a class of forms not at presi^it 

 assignable elsewhere it must be freed from such manifest Bidduli)hia forms as this. 

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

 being identical with Agardlrs Dialoma vesiculosum ^ or Isthtfiia vesindosa^o I clo wmI 

 here adopt the specific name assigned by Boyt^r above, but follow the opinion of Van 

 Heurck, who in this respect agrees w^itli Elirenberg, Ktitzing, Ralfs, and Grunow. 



Some of the figures of this diatom, notably those by Kutzing, Pritchard, and WoUe, 

 (those of the last copied from Van Heurck)/^ are so unlike this form as to be utterly 

 misleading. 



Found at stations 2G8011, 2807, 2835, off central California to Galapagos Islands. 



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

 Brtft.Diat.l: 49. p^./^?./ Ji5. 1853. Jan. Abb. Schles. Ges. Vaterl. Cult. 1862'-': 

 IG. pi lA.f. 9. 18G2„ Rabh. FL Eur. Alg. 1: 311. 1864. O'Meara, Proc. Roy. 

 Irisii Acad. M. 2: 274„ pi 27. f. 8. 1875. Griff. & Ilenf, ilier. Diet. ed. 3. pi 

 19. J\ 9. 1875. Schmidt, Atlas pi 122. f, 6. 1888. Van Heur. Synop. 205. pi, 

 98, J. -hl^. 1881-5. AVolle, Diat. N. A. pi 96 J. 9-1 L 1890. 

 Diatovia aarituvi Lyng. Hydro. Dun. 182. pi 62, f. D. 1810. 



OdontcMa aurita C. Ag. Consp. Diat. 5G. 1830-32. Kiitz. Bacill. 137. pi 29. f. 88. 

 11844. De Toni, SyL Alg. 2: 8G2. 1894. 



Denticella auntaEhi'viih, Mikrog. pi S5A. XXTII, f. 7. 1854. Bail. Am. Journ. 

 Sci. U. 22: \.pl l.f. 26-28, 185G. 



ffVan Heur. Synop. 207. 1885. 



^C. Ag. Syst. Alg. 7. 1824. 



*:^C. Ag. Consp. Crit. Diat. 55. 1830-1832. 



^Van lieur. Synop. pi, 103./, c. 1881. 



