304 CONTEIBUTIOXS PROM TITE NATIONAL IIERBARIUM. 



I am at present unable to include in this species some forms so clashed by other 

 writert^. Thus Trkeratium orientale Bail, & Harv.*^ is hardly close enough to T. grande 

 Bright., -which it most resembles, to make me certain that it can be rightly identified 

 with that form. It is, however, so disposed of by Ilabirshaw, & and i::^ classed by him as 

 a synonym of Biddulphia grandis (I>rij;;ht.) Boyer, which is in this paper united with 

 B.favus. The same is true of Tricnativni cuspidaiuvi Jan., which J5oyer unites with 

 this species, and De Toni is disposed to class with his emended genus Amphitetras. It 

 is figured by Schmidt and also by Janisch. ^ A question might also be raised as to the 

 rather divergent varieties above united with this spe<'ies, viz, TnceratinTii muncatvvfi 

 Bright, and T. scitulum Bright. Ihit Schmidt says,^ *'0b T. viuricatum imd scitulurti 

 mehr sind als kleine Formen von 2\ farus ist noch geuaiier zu untersuchen/' and 

 Ralfri^ says of T. scitulum, ^'Except in its smaller size, we sec not how this specyes 

 differs from T.favus.'' The T. sciluluni variety is abundant at station 3G04, which 

 also contains fine examples of sexangular and octangular specimens of T. grande. 



Found at stations 2807, 2808, 2915II, 291GII, 29]7ir, 2918II, 29I9II, 2920II, 292111, 

 300811, 3010II, 30I3lIj 3604, 4430II, 4571H, Galapagos Islands to Berijig Sea and 

 Hawaiian Islands. 



Biddulphia gladioruin Mann, sp. nov. Plate XLVIT, figukk 4. 



Valve elongated-ovalj flat to nearly the full outline of the frustule, then bending 

 perpendicularly downward in a broad band to the line of suture with the girdle; top 

 and vertical sides of the valve delicately beaded with Pleurosigma-like markings; the 

 two terminal processes, corresponding to horns in similar species, here scarcely raised 

 above the surface of the valve^ appearing as small obliquely inclined rings; five stout 

 setaCj tapering to an acute point, and occasionally imperfectly forked^ set close to the 

 margin uf the fiat portion of the valve, their bases broadened and extending into a low 

 delicate hyaline comb or ridge, thus forming a connecting line between the setae; a 

 thread-like hollow central line within the setae extending to near the tip; two of the 

 setae next to and interior to the two processes. 



Length of valve, 0.11 mm. ; length of setae, 0.043 to O.OG mm. 



Type in the U. S. National Museum No. 590] 38, from station 4029II, Bering Sea, 

 June 27, 1900; 813 fathoms, bottom of gray sand and clay. 



This diatom finds its nearest likeness in Biddulplna spinosa Grev./, though as to the 

 flat top of the valve when seen in zonal view, as well as the delicate Pleurosigmadike 

 markings, it resembles B. cormda Brun..a Its distinctness from Brun's species is due 

 to the absence of the long-produced horns with inflated bases, to its almost perpen- 

 dicuhir sides from the girdle to the h^vel valve face,an<l to the less sigtuficant difference 

 in the shape and number of the spines. It belongs to that group of the Biddulphiao 

 which De Toni h places in the genus Benticellaj in conformity with Tirunow's sugges- 

 tion, i This grouping, which I do not consider to have any generic value, would bring 

 together many similar forms of which Biddulphia wohilitnsis (Bail.) Grun., may be 

 taken as the type; diatoms of relatively large size but of ex(^eedingly delicate silica 





^^Proc. Acad, Phila. 6: 430. 1854. Wilkes Explor. Exped. 17: ]79. pi. 9.f. 9. 18G2. 



^llAh. Cat 337. 



c Schmidt, Atlas pi. 84. f^ 2-S. 1S85, Jan. Gaz. Exped. pi. 11. f. 14-15. 



c^Op. cit. pL 8S,f. 11-16. 



MVitch. Hist. Infns. ed. 4. 857. 1861. 



/Trans. Micr. Soc. Lond. n. s. 13: {]. pi. 1 . f. :h JSr)5. Moot). Biat.-taf. pJ. 62. f. S. 



1S90. 



ffLo DiatojuisLo 2: 74. pi. 6./. 3. 1894. 

 ^^DeToni, Syll. Alg. 2: 882-886. 1894. 

 i'Denkschr. Akad. Wien 48-: 58. 1884. 



