',r 



MANN DIATOMS OF THE ALBATROSS VOVAGES. 



285 



nearly every one of ilio following lun<,^ list of dredgings and soundin^<,^R wore taken 

 alonir lh<^ eoastsKif Alaska and KanichaLka. At stations35C911and :>G71II it. islliecom- 

 monest of all forms, and in the latter it makes up 5 to 10 per cent oi the diatuniaeeoua 

 mass. It is important here to notice tliat of the thirty-three gatherings found io con- 

 tain this diatom twenty-nine were hydrographic soundings and only four dredgings. 

 It is evident that the method of taking the hydrographic soundings as contrasted 

 with that of the regular dredgings explains why these exceedingly light and huoyant 

 forniri are abundant in one class of gatherings and not in the other. The four dredg- 

 ings were taken In Arctic waters and yet contained very few specimens, while many 

 dredgings made where this species is shown to be al>undant show no truce of them. 

 It is a clear illustration of the necessity of employing more carefid methods for col- 

 lecting diatoms in connection with the other marine work of the l.'nited States Fish 

 Conunission, a sul)jcct discussed in the introduction to this report. 



Found at stations 228711, ;5207H, mnll, 3399II, 35G51I, 35G8IT, 35G91I, 3(303, 3<)l)4H, 

 3G07,3G11, 3G35H, 3GG3II, 3GG9IT. 3G7LII, 3683II, SGS-UI, 3G91JI, 3G921I, 3G93II, 3()991I, 

 3704H, 3784, 37SGII, 4()13H, 4(]i4ir, 4019II, 4022II, 402311, 402411, 4025II, 4027H, 

 402SH, Bering Sea and Okhotsk Sea to Honshu Island, Japan. 



/■ 



De 



Toni, Syll. Alg. 2: 824, 1891. Perag. he Diatomiste 1: 109. pL 2.f, 1 la, pi. 3. 



/ i-S, 1892. Castr. Hep. Voy. Chalh I5ot. 2: 73. pi. 24. f^ 5, 18SG. Cleve, 15ih. 



Sv. Vet. Akad. Ilandl. 1'^: 11. 1S73, Bruu .^ Temp. Mem. Soc. Phys. et Hist. 



Nat. Geneva 30'*: 73. 1889. Van Hear. Treat. Dial. 414. pi SSJ, SS3. 189G, 

 Though tlie beautiful iridescent ends are al>undant in the following dredgings, no 

 complete frustule was ft)und and ^■ery rarely a trace of the disintegrated bands com- 

 posing the tube. Although large, this pellucid diatom if badly described by its 



specific name, rohuala. 



Found at stations 2919, 2923, 2929, 3Glh 451CH, Bering Sea and off southern and 



Lower Califurnia. 



w 



CHAETOCEROS Ehreiib. 



Chaeiocrro^ Ehreub. licr. Akad. Wiss. Berl. 1844: 198. 1845. Van Hour. Synop. 

 195. pi. 81-82, 1881-5. Rabh. Fl. Alg. Eur. 1: 31, 321./ .97. 18G4. Pritcli. llist< 

 Jnfus. <k1. 4. cSGl. 18GL Pright. Quart. Journ. Micr. S(i. 4: lOo. pi. 7. lSr)G. 



Badcriastram Shadl). Trans. Micr. Soc. Lond. n. s. 2: 14. 1854. Pritch. Hist. Infiis. 



ed. 4. 8G3. 18GL 

 Ilcrcolhica Ehrenb. Per, Akad. AViss. Perl. 1844: 2G2, 2(i9. 1845; Jlikn^g. j)!. XL 



XVIILJ. 7. 1845, 

 Peripiaa Eluvnb. lior. Akad. "Wiss. Perh 1844: 270. 1845; Mikn.g. /;/. .?/?. XVITL 



J. 9, 1854, Pritch. Hist. Infus. ed. 4. 8G5. 1861. 

 Avtiniscns Ehrenb. V>vv. Akad. \\iss. Berh 1854: 237. 1855, in part, 

 Goniofhevimn Khrcid>. Per. Akad. Wiss. Perl. 1844: 82. 1845. 

 Divladia Elnvnb. Per, Akad. Wiss. Perl. 1844: 73, 79. 1845. 

 Symhndnum Ehrenb. Wvr. Akad. Wiss. Perl. 1845: 73, 155. ISIG. 

 SkdiUmrwn Tirnn. Van Ucur. Synop. pi. SSterf. 5. 1881, not Grcv. 18G5, 

 Perafjnllin Scliutt, Per. Deut. Pot. Ges. 13: 48. pi. 5.f. 28a^h. 1895?, 



This genus has occasioned great etmfusionin the nomenclaturt! of the Diatomaceao 

 ' by reason of tlu^ peculiar mod(^ of its growtli. It is a inainly or p(Thaps wholly pelagic 

 form and is found in both th<^ living and fossil slate. Il grows in long filaments, th(^ 

 single frustules of which oft(^n vary widely, especially in respect to the charactt^r of 

 the processes or setae that adorn them. Thcst^ may l)e, in some few instances, 

 wholly lacking, may })roco(Hl from opi)osite sid(\s of the zonal portions, or may encirch; 

 the sam(\ TIk^ terminal valves are gfUK^ally oriiamenled willi i)roc4^sses quite (Uffer- 

 ent from thos(^ on the intermediate frustules. Slill furlln^r to eomplicat*^ the matter, 



^ 



