312 0NTRIB1 riONS FROM Mil NATIONAL HERBARIUM. 



D l ■ : b, Hydro. Dan 181 1819 I Ug 6 



L: 294, 1821, in part, 

 h Sv. Vet Akad. Elandl. 1 : 10. L873. Do Toni, Byll. I 



b >ve genus by Cleve see above) to the single species, /. obli- 

 i I Smith.) Ehrenb., / and the forming of a new genus, 



[sthmiella, to include the spe< ies destitute of ribbing is wholly unwarranted, and has 

 bj n • one but De Toni in hi- Sylloge Algarum. 



Iathmia obliquata .1 E Smith Ehrenb. [nfus. 209. pi. 16 j ■ 1838. Rails Ann. 

 V,- il 12:272 . L843. 



• Mill. 137. pi. 19. f. 5. L844. W. Smith, Synop. Brit. Diat. 

 2: 1856 Rabh. Bcitr. 1: 9. pi. ,. ./'. 12. L863. O'Meara, Proc. H 



Irish Acad II 2: 279. pi. 17. f. 15. L875. II I. Smith, Sp. Diat. Typ. no 



I. Schmidt, Atlas pi. 185. f. l 6. 1888. Pritch. Hist, [nfus ed. I B51. 1861. 

 Van Heur Treat. Diat. \b2.pl.34.f.891. L861. Grun. in Fenzl, ReU 

 Bol 1: L02. pi. 1A. i. il. L870. 



I J.E.Smith, Eng. Bot. 26: pi. 1869. I808,inpart. 



obliquatum Lyng. Hydro. Dan. pi. 62. L819, in pan C. Ag. Consp. Diat. 

 55. • 



l . Au r . Consp. Diat. 56. L832, in pan. Kin/. Linnaea 8: 579. pi. 4. 

 i. 

 Ehrenberg was the first to separate the then single species of isthmia inn. two, t<> 

 ihf first of whirl), corresponding to whal Kutzing subsequently called /. nervosa, he 

 gave ih'- original specific name obliquata.b To the second he gave the name em 

 Tin- name obliquata, though recognized by some writers,** was generally dropped in 

 Eavor of the more descriptive name of Kutzing. Boyer, in attempting to reinstate 

 obliquata, ha- done so at the expense of Ehrenberg's enervis, an arrangement <juit <- 

 impossible in view of Ehrenberg's descriptions and figures, Kiitzing's nervosa not 

 ha\ ing been proposed ant il L844.< 



I I is remarkable how few specimens <>i" this common marine diatom were met with in 

 tin' dredgings and Bound ings examined for this report, especially as, <>n account of its 



size and massive structure, it could not have been overlooked. 

 Found at stations 2844, 2848, 2851, 3200H, 1013H, 1530H, south of Alaska peninsula, 

 on southern < lalifornia and Honshu [sland, .la pan. 



HEMIAULUS Ehrenb. 



HmiauJu* Ehrenb. Ber. Akad. Wiss. Berl. 1844: 199,203. L845; Mikrog.pJ.Jt 

 Char, emend. Heib. Km. Overs. Danske Diat. '2'2. 13. L863. Grev. Trans. Micr. 

 I ad. ii. - 13: 27. />/. • /../'. 5 16. L865. De Toni, Syll. Alg. 2: 836. L892. 

 Van Heur. Treat. Diat. 155. /". 182-185. 1896. Cf. II. I.. Smith, The Lens 1 89. 

 L872. and Grun. Denkschr. Akad. Wien 48': 60. L884. Boyer, Proc. Acad. Phila. 

 1900: 738. L901. 



• Heib. Krii . Overs. Danske Diat. 22, ■">:',. />!. ■ ;./. 8. L863. 



Heib. Km. Overs. Danske Diat. 22, •'><>. />!. S.f. 7. L863. Witt. Verh. Rubs. 

 Mm. Ges. II. 22: 34. pi. il./. 1 n. L886. De Toni, Syll. Alg. 2: 854. 1894. 



Ehrenb. [nfus. 209. 18 

 >>< >p. cit. pi. 16. f. 5. 



< >p. cit. pi. 16. f. 6. 



•i Ralfa, Ann. Mag. Nat. Hist. 12:272. L843. Lagerst. Bih. Sv. Vet. Akad. Handl. 

 I 14 : 11 - 



!' lead. Phila. 1900: 688 k 689. L901. 



