302 CONTRTBUTTONS FROM THK NATIONAL HERBARIUM. 



ppooios of Brnn must, therefore, be ranked as a variety of the above. Tlio second 

 variety, found at .station 2807, is the form calk^l OdontcUa obtusa (Kiitz.) Kalfs.^ 

 It is clearly a small variety of this species^ exact examples being easily found 

 ill most large gatherings, as in the above-mentioned type-slide of H. L. Smith. But 

 it is doubtful ifthiti is the genuine Odonldla ohlasa Kutz., which seems to liave 

 a much closer resemblance to B. roprriana Grev.^ Thus Klitzing^^ figures it as 

 a smoother diatom than B. edwardsii, as does also Ralfs,*^ and under its synony- 

 mous name of 0. biddalphioides Wigand^ it also differs greatly. I therefore have 

 not included this in the alcove synonymy. B. primordiaUs Brun/ i.^ also omitted 

 as a synonym. The figuros of tlie two species are often (juite close. But typi( al 

 specimens of B. pmnonUaVis are frequent in gatherings made at stations 2844 ami 1320311 

 and when these are ci)mijar<'d wilh examples of 7J. tdaardsil the difference is seen to 

 be far too wide to admit of their union. It is perhaps a comparison (jf tlie figures of 

 these two diatoms, ratlier than (lie specimens th(Mns(*lves, that has led Grove to unit(? 

 thorn. f7 Do Toni ^^ notes the similarity of the two, but gives Brim's form separate rank. 

 I can not agree with 11. L. Smith i in considfTJng this species as "a hirsute variety of 

 B. roperiana Grev.'' 



The specimens found l)y me were mostly large forms, ranging from 0.095 mm. in 

 station 3G01 (Bering Sea) to 0.14 nnn. in station 281S, soutli of Alaska peninsula. 



Found at stations 2287II, 2807, 2848, 3G04, 3G93II, 401311, off Alaska peninsula, to 

 Bering Sea and south to Honsliu Island, Japan* 



Biddulphia extensa Mann. sp. nov. Plate XLVII, fioci^es 1, 2. 



Valve an elongatfvl and perfc^ctly symmetrical ellii>se, about four and one-half times 

 as long as wide, eh^gantly beaded with fine, round, closely set beads, radiating from a 

 small circular hyaline central area, the lines so arranged as to form concentric ellipses 

 on either half of the valve, these extending from the circular central area to the bases 

 of the long vertical horns arising near the apices of the valve; of the lines radiating 

 frnm the center only the two (v)inciding with the median transverse axis straiglit, the 

 others curving in conformity with the two ellipses; two stout, straight, and hmg spines 

 set on opposite sides of the central area, half way between the valve's longitudinal and 

 transverse axes, and spread upward and outward; in zonal view the valve showing the 

 two horns to be long, tapering, and v<^rtical, and broadened into a flat-topp<Ml apex, this a 

 little higher than tlu^ much elevated central area; the base of the valve jcjined to the 

 girdle by a curved line; approximate valves of adjoining frustules united by the 

 tips of the horns and further connected by a j)ellucitl fdmdike silicious membrane 

 at the center, parting and narrowing toward the apices; the two central areas almost 

 touching, and the lour long spines arising from these interlocked, the two from each 

 \'alv(i being on opposite sides of the other valve. 



In the single dredging in Avhich this species was found it is abundant; but I have not 

 boon able to find any certain reinains of the connec^tini; <i:irdle. 



Length of valve, 0.130 mm; width of valve, 0.028 mm. 



Type inU. S. Nati<mal Musc^um, Xo. 590137, from station 4505 II, Santa Ciuz light- 

 house, Monterey Bay, Oah; lOfatlionis. 



''Van Hour. Synop. pi 100. f. 11-14- 1881. 

 ?>Quart. Journ. Micr. Sci, 7: pZ. S.f. 11-lJ, 1851). 

 ^Kiitz. Bat-ill. 137. pi. IS. VIII. /. 1-3, f; S. ISU. 

 '^Britch. Hist. Infns. ed. 4. SIS. pL 1-Lf. .>V;-.9,^4. ISdI. 

 elledw. 2: 45. pJ. 7./. 21. 18G0. 



fMm\. Soc. Phys. et Hist. Nat. Geneva 31^: 12. pi IS J. P, pi 14. f- fl 1891. 

 £? Schmidt, Alias j^l 172. f. 4- 

 ADe Toni, Syll. Alg. 2: 8M. 1894. 

 «Am< Journ. Micr. 4: 101. 1879. 



