M\NN DIATOMS OF THE ALBATROSS VOYAGES. 309 



separate rank to Ktitzing'e and Greville's species. Grunow fl says, under B.obtusa 

 I Kiii/. | Grun.: "Hierher scheinl mir ale grosse Form Bidd. ro\ i rev. /u ge- 



haren." Grunow here incorrectly credits the inclusion of Ktitzing'e Bpecii 

 Biddulphia to himself, an error repeated by Schmidt.^ It was previously 30 1 lassed 

 by Kali'.-.' 1 think ii is on the whole best to do as Van Beurck and I >«• Toni have done, 

 lioii.r the resemblance between Ktitzing'e and Greville'e species, but keep them 

 separate. Thesamewill betrueof the synonym. of Ktitzing'e species, Odontella bid- 

 dulp'rvUndesWigajid.d A new variety ie here figured. 

 Found at stations 3604, 3688H, 3712H, Bering and < Ikhol 



Biddulphia scutellum Mann s|>. nov. Plate XLVII, PIGI 1:1 3. 



Valve an elongated oval, the Burface evenly convex excepl for a circular central 

 area as wide as the valve, this ilai (nol concave ; markings of the central area, 

 fine beading in radiating rows from two approximate foci; of the resl of the valve, of 

 similar beading in rows running chiefly parallel with the long axis of the valve; in 

 addition to this beading, minute pointed processes scattered evenly over the entire 

 valve, as in valves of B. edwardsii Febiger; the two processes, short, broad, and circu- 

 lar, close i" the ends of the valve. 



Length of valve, 0.152 mm.; width of valve, 0.058 nun. 



Type in the U. S. National Museum, No. 590139, from station 2844, off Aleutian 

 Islands. July L'S. lsss; .">■} fathoms, bottom of gray sand. 



The nearesl species to this one is Biddulphia obtusa Ktitz.) Kali'-, in the doubtful 

 figure of ii given in Van Beurck, < which, as before stated, is somewhal nearer to B. 

 edwardsii Febiger. This fact, taken in connection with the presence of fine spines 

 scattered over my specimens similar to those on B. edwardsii, makes ii possible thai 

 both this species and the forms figured in Van Beurck are extreme varietiee of 

 Febiger's species. On the other hand, both may be representatives of a separate 

 species. My specimen differs from that figured by Van Beurck in having no concavity 

 at the center, in the size of the beading, and in the central area being the full width 

 of the valve. 



Biddulphia setigera 1 Bail. I Mann. 



Triceratium spinosum Bail. Am. Journ. Sci. 46: 139. pi. S.f. 12. L844. Pritch. 

 Hist. Infus. ed. 4. 853. pi. 6./. 19. 1861. Schmidt, A.tlas pi. 87./. 2-5, 7, 18-15. 

 1885. 

 Triceratium setigerum Bail. Smithson. Contr. Knowl. 7: 11./. 26. L854. 

 T " ratiwm armatum Roper, Quart . Journ. Biicr. Sci. 2: 283./. /. L85 1 : 4: 274. pi. 17. 

 f. 9-12. lSbG. Moeb. Diat.-taf. pi. '■>./. 9 12. L890. \Y. Smith, Synop. Brit. 

 Dial. 2:87.1856. Cleve, Bih. Sv. Vet. Akad. llandl. 5 : L5. L878. Castr. Rep. 

 Voy. < hall. Bot. 2: L09. pi. 6.f. 2. L886. 

 Triceratium serratum Wall. Quart. Journ. Micr. Sci. 6: 243. pi. 12. f. /-■•'. K"> s . 

 Pritch. Bist. [nfus. ed. 1. 855. 1861. Moeb. Diat.-taf. pi. 16. f. /-.;. L890. De 

 Toni. Syll. Alg. 2: u::\. L894, a- Bynonym oi Amphitetras. 

 Biddulphia spinosa Boyer, Pro,', a. ad. Phila. 1900: 703. 1901. 

 From the above are excluded some forms united by other authors. The variety 

 named ornata by Grove & Sturl f is nol al all like this species, bul is nearer Triceratium 

 omnium Shadb., as the authors suggest. Bui ii possibly represents a new spi 



a Grun. Reise Novara Bot. 1: 23. L870. 



6 Schmidt, Atlas pi. 122. / SO. L888. 



c Pritch. Bist. [nfus. ed. 1. 848. L861. 



d Bedwigia 2: !•"». pi. ;./. 21. L860. 



1 Van IKiir. Synop. y//. 100. f. 11-1 ;. L881. 



/ Journ. Quek. Micr. Club 11. 2: :;i".». pi 19. f. 20. L886. 



