304 CONTRIBUTIONS PROW Mil NATIONAL HERBARIUM. 



nclude in tlii— specie* some form* 1 \<\ other 



ntaL Bail. A !l i tardly close enough to T. grand* 



. which 11 most resembles, to make me certain thai ii can be rightl) identified 



with' bowevei edof by Habirshaw,band in clawed by him as 



a In. h i- in tlii— paper united i ith 

 8pidatum Jan.. which Boyer unite- with 

 thissp* nth his emended genus Amphitetrae h 



S< hmidt and also by Janisch. • A question might also be raised as to the 

 rather «li\ ergenl varieties above united \\ ith this Bpecies, \ i/ Triceratium muricatum 

 Bright Bright. But Schmidl Bays,d"Ob T. muricatum und scitulum 



mehr -i i n 1 ale kleine Pormen von T. favus isl noch genauer zu untersuchen," ;m<l 



Excepl in it- smaller size, we Bee nol how this species 



I ri«-t \ i- abundant at stat ion 3604, \\ hich 



a tains fine examples of sexangular and octangular specimens of '/'. grand* . 



Found at stations 2807, 2808, 2915H, 2916H, 2917H, 2918H, 2919H, 2920H, 2921H, 



3008H, 3010H, 3013H, 3604, W30H, 4571H, Galapagos [elands to Bering Sea and 



II .'..mi. m Islands. 



Biddulphia gladiorum Mann, sp. nov. Plati XI. VI I. noi ai I. 



Valve elongated-oval, flat to nearly the full outline of the frastule, then bending 

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

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

 two terminal pi rresponding to horns in similar species, here scarcely raised 



above the surface of the valve, appearing as -mall obliquely inclined rings; five stout 

 tapering to an acute point, and occasionally imperfectly forked, Bet close to the 

 margin "i" the flat portion of the valve, their bases broadened and extending into a low 

 delicate hyaline comb <t ridge, thus forming a connecting line between the Betae; a 

 thread-like hollow central line within the Betae extending to near the tip: two of the 

 setae nexl to and interior to the two processes. 



Length of valve, 0. 1 1 nun. ; length of Betae, 0.043 to 0.06 nun. 



Type in the FJ. s. National Museum No. 590138, from Btation 1029H, Bering Sea. 

 June i'7. L900; 813 fathoms, bottom of gray sand and clay. 



This diatom finds it- nearest likeness in Biddulphia spinosa < rrev. '. though as to the 

 Hat toj. of the valve when seen in zonal view, as well as the delicate Pleurosigma-like 

 markings, it resembles /:. <-<>rnnt<i Brun.0 Its distinctness from Bran's species is due 

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

 dicular sides from the girdle to the level valve face, and to the less significant difference 

 in the Bhape and number of the spines. It belongs to that group of the Biddulphiae 

 which De Toni >■ places in the genus I )ent icella. in conformity with < Irunow's sugges- 

 tion." This grouping, which I do nol consider to have any generic value, would bring 

 together many similar form- of which Biddulphia mobiliensis (Bail.) Gran., may be 

 taken a- tin- type: diatom- of relatively large size bul of exceedingly delicate silica 



Pro \cad. Phila. 6: \:\n. L854. Wilkes Explor. Exped. 17: I7 ( .». pi. 9.f.9. 1862. 

 '-Hah. Cat. 337. 



- hmidt, Atlas pi. 84. / '- L885. Jan. Gaz. Exped. pi 11./. 14 15. 

 -/< >|>. oit. /,l. 83 ./'. // 16. 

 < Pritch. lli-t. Infus. ed. i B57. L861. 



/'IVan-. Mnr. Soc. Lond. n. b. 13: 6. pi. I./.S. 1865. Mod,. Diat.-taf. pl.6t.f.S. 

 1890. 



I e Diatomiste 2: 74. pi. S.f. S. 1894. 



De Toni, Syll. Alg. 2. 894. 



I Denkschr. \kad. Wien 48 : 58. L884. 



