308 CONTRIBUTIONS FEOM THE NATIONAL HERBARIUM- 



Biddulphia reticulata Ruper, Truus. Micr. Soo. Loud, ii. p, 7: 14. pL 2,f, lS-15. 1859. 

 Moeb. Diat.-taf. pi 26. f. IS-ir.. 1890. Castr. Rep. Voy. ChalL But. 2: 102. pi 26. 

 f. 9, 1S8C. Boyer, Proc. Acad. Pliila. 1900: 708. J901. VaiiHeur. Syiiup. pi 102, 

 / 1-2 {not/. S), 1881. 

 OdonhUa? rrflculafa DcToni, Syll. Alg. 2: 868. 1894. 



Typical oxainplos of this diatom are plentiful in the dredj:^iiig to be cited. For a dip- 

 cushion of the confii.'^ion bct:vcen quadrate f^pccimeiis of this species and B. duhla 

 (Bright.) Cleve, see under tliat si)ecie.s. 



Found at station 3G9G, off Honshu Inland^ Japan. 



Biddulphia robertsiana (Grcv.) Boycr, Broc. Acad. Bhila. 1900: 707. 1901. 



Triceratiiiin robertsiiminn Grev. Quari. Journ. JVIicr. Sci. n. s. 3: 231. pi ,9./. 9. 18(>3; 



6: pi J./. J. 188(5. Moeb. Diat.-laf. pi 47. /. 9, pi 71. / 22. 1890. Schmidt, 

 Atlas p?. 83. f. S-7 (var.), 2^/. 82. f. 14-15. 1885, 



This <liatom is rather close to the Triceratium graruJe form of Biddulphia fants 

 (Ehrenb.) Vai\ ITcnirck, both in its genc^ral shape anf] in llie fmv radial ing secondary 

 markings. Still, the fact that the processes are very obtuse^ and separated by a hyaline 

 area from the rr^ticulation and that the angles are not at all prominent, together with 

 the general presence of large spines on the sides, give it an aspect that warrants its 

 separate name. It is quite possible that the first of Ihe Greville figures cited al)ove is 

 of ^^Tricemtiuvi yrande^^ and his second figure that of the true type. Tliey are v<>ry 

 dissimilar. Tlie second is at any rate more like the forms classified by me in the 

 present species and agrees bettor with the description given by Greville, except in 



the matter of spines, all my specimens having two stout spines near tlie margin of 

 each of the three sides. It is spoken of l)y Greville, Schmidt^ and Boyer as very rare. 

 In the single gathering wht^re I found il it is fairly abnndanL. Boyer says: "Pacific 

 soundings 20"^ 10' N., 158° 14^ W., 2,507 fatlioms/' My sixnimens came from Pacific 

 soundings 21° 21^ N., 157° 09' W., nnd though the depth is only 570 fathoms, the loca- 

 tion is right on the edge of a deep plain averaging 2,500 fathoms; this particular 

 sounding being just close enough inshore to get the rise of the land from the true sea 

 bottom. This i^ another one of many instances describ(nl in this work where a single 

 species is very significant of locality on the sea bottom. 

 Found at station 2920II, Hawaiian Islands. 



Biddulphia roperianaGrev. Trans. Micr. Soc. Lond. n. s. 7: 163. pi S,f. 11-13. 1859, 

 Van Ileur. Synop. pi 99. f. 4-6. 1881. Schmidt, Atlas pi 120. f. 20-24^ 1888. 

 H. L. Smilli, I)iat. Sp. Typ. no. r>25. 1874. Boyer, Pnu-. Acad. Pliila. 1900: 700. 

 1901. Castr. Rep. A'oy. Chall. But . 2: 106. pi 26, f. 4^ 1886. 



Pl.ATE XLVI, FTOTTnE 2. 



Odov fella roprriana De Toni, Syll. Alg. 2: 868. 1894. 



It is also possiljlcj as suggesti'd by Boyer, '^ that Biddulphia {Odontella) discigera. Grun. 

 and TriceraliuiK {Odontella diavigera var.?) caUfornicum Grun.^ might be classed as 

 synonymous with the above; but without more light than these two fignrcvs afford T am 

 unwilling to agrf»e to the suggestion. As has been statc^d und(T Biddulphia edtrardsii 

 Febiger, I find that B. obtiisa {Kiiiz.) Ralfs, as figured in Van Heurck^' agnn^s better 

 with that specie.^ than with this on(^, though De Toni <^ favors the idea of tin's spcci(^s 

 being a large form of Kiitzing's species. As to that matter I have nui(4i doubt about 

 there being any <^lose similarity between these species independent of the relation of 

 Van Heurck's figures. De Toni follows the reference to Van Ileurck's figure with Lhc 



remark, ^^Odonldla roperiana (Grev.) videtur forma major hujus speciei," but he gives 



...__ , ^^ 



il Proc. Acad. Plnla. 1900: 700. 1901. 

 I Van Hour. Synop. pi 108. f. 9, 11. 1881, 

 ^ Op. cit. 100./. 11-14, 1881. 

 d De Toni, Syll. Alg. 2: 863. 1894. 



