MANN DIATOMS OF THE ALBATROSS VOYAGES. 365 



L880. De Toni, Syll. Alg. 2: 237. 1891. Cleve, Sv. Vet. Akad. Handl. 2< 



L894. 

 Pleurosigma affi.ru Grun.; Cleve & Grun. Sv. Vet. Akad. Handl. IT: 51. L880 

 II., ir. Synop. L15. pi. 18. f 9. L881; Treat. Diat. 252. pi S.f. 163 Dot/ ■ 

 L896. Perag. Le Diatomiste 1 ; : 9. pi. ;../'. /'. t-8 doubtful . 



L891. 

 Pleurosigma virginicum II. L. Smith, Sp. Diat. Typ. do. H6. L874. 

 \'aii Beurck places here /'. nicobaricum Grun., fl probably 1 > : t ~ i 1 1 <_"• it on Grunow'fi /'. 

 affiru nicobarxea.b I doubl the wisdom of calling this a variety of /'. a 

 Certainly Granow's type in the above citation and in Peragallo' 8 Monograph c Bhould 

 doI be forced im<> this Bpecies. As Cleve points out, ii is Dearer to /'. i alidum Shadb. 



Found at stations 2844, 3607, Aleutian [elands and Bering : 

 Gyrosigmarigidum W.Smith Griff. & Benf. Micr. Diet, ed.3.356. pi tl.f.SO. L875. 

 Pleurosigma rigidum W. Smith, Synop. Brit. Diat. 1:64. pi :>>. Pritch. 



Hist. Enfus. -I. I. 918. L861. Rabh. l'l. Eur. Alg. 1: 232. L864. II. I.. Smith, Sp. 

 Dial. Typ. do. 410. L874. Van Beur. Synop. pi 19. f. 8. L881; Treat. Diat. 251. 

 pi S.f. 265. L896. Truan, Anal. Soc. Espan. Bist. Nat. 13: 19. pi 9.f. ;. L884. 

 De T-ni. Syll. Alg. 2: 237. L891. Cleve, Sv. Vet. Akad. Bandl. 26 : 39. L894. 

 Perag. I.- Diatomiste 1 ; : M. pi 6.f. : 7. 1891. Griff. & Henf. Micr. Diet. ed. 

 •1. pi 15. f. SO. L883. 

 Pleurosigma validum Shadb. Trans. Micr. Soc. Lond. d. s. 2: Hi. ///. l.f. 8. L854. 

 Cleve & Grun. Sv. Vet. Akad. I Ian. 11. 17-: :>:;. 1880. De Toni, Syll. Alg. 2: 245. 

 1891. 

 Pleurosigma giganteum Grun.; Cleve & Grun. Sv. Vet. Akad. Handl. 17-: 53. 1880 



doI 7'. giganteum Grun. Verh. Zool. Bot. Ges. Wien 10: 558. pi .;. /. /. L860 

 In tin- lasl name there is a confusion on the part of tin' author, which i- repi 

 in several other works. Tin- original /'. giganteum is no1 only plainly drawn a- a 

 transverse-longitudinal striated species, bul is bo described, the ambiguous sentence 

 "lineolis decussatis subtillimis" net necessarily meaning oblique lined, a- any line 

 at right angles to another is strictly "decussating." In tie- case of oblique striation 

 Orunow in that work uses such expressions as "in tineas obliquas." Moreover, he 

 expressly Bays of /'. >ji<i<int> nm. ■•Am nachsten stehl ihm das folgende P 

 tropicum, welches jedoch durch kleinere Gestall und Btarkere Biegung wesentlich 

 verschieden i-t. - ' This diatom is also figured and described with transverse-longitu- 

 dinal Btrise and is universally recognized as having that character. Yet Grunow in 

 his later works'^ unites /'. gigantt um to /'. i alidum Shadb., and Bays of his own species, 

 " PI giganteum hat I s schiefe und 17 Querstreifen," and it is so figured by Peragallo 

 and others. 



At Btation 2807 occurs a small and delicate variety agreeing with a figure* which 

 Peragallo erroneously speaks of as typical. 



Found at stations 2807, 3520, Galapagos Islands and Bering Sea, 

 Gyrosigma sagitta (Temp. & Bran) Mann. 



Pleurosigma sagitta Temp. & Brun, Mem. Soc. Phys. e1 Bist. Nat. Geneva 3< I 



pi .'/./. 19. L889. DeToni, Syll. Alg. 2: 242. L891. 

 Then- is reasonable doubl of this being a synonym of /'. nicobaricum Grun., ' with 

 which it is united b) Cleve and other-. It do1 only lack- the double-rowed trans\ erse 



a l-Vn/l. Reise Novara Bot. 1: 101. pi lA.f. :<>. L870. 



''Van Hour. Synop. L15; Suppl. pi C. f. 84. I sv l : >- Cf. Van Hour. Treat. Diat. 

 252. pi. S.f. 164. L896. Perag. Le Diatomiste l 4 - 6 : pi l.f 10 It. L891. 

 c Perag. op. cit. pi ;./. 9. 

 '/Sv. Vet. Akad. Handl. 17-: 53. L880. 

 ehe Diatomiste 1*-*: pi S.f. 6. L891. 

 /Fen/1. Eleise Novara Bot. 1: L01. pi lA.f .-". L870. 



