.\I\NN DIATOMS OF I 111. ALBATROSS VOYA< 285 



nearly every one of the following long li-i of dredgic taken 

 aloi i g the coastswf Alaska and Kamchatka. \t statione 35691 Eand367lHit is the corn- 

 ea -i of .ill forms, and in the latter it makes up 5 to 10 |>er cenl oi the diatomai 



mass. Ii is important here to notice thai of the thirty-three nd to con- 



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

 .11 ie evident thai the method of taking the hydrographic soundings as conti 

 with thai of the regular dredginga explains why th< dingly light and buoyant 



forms are abundant in one - lass of gatherings and nol in the other. The four dredg- 

 ings were taken in Arctic waters and yel contained ver icimens, while many 



dredgings made where this Bpecies is shown to be abundant show no trace of them. 

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

 lecting diatoms in connection with the other marine work of the United States Fish 

 Commission, a subjecl discussed in the introduction to this report. 



Found at stations 2287H, 3267H, 3361H,3399H, 3565H,3568H 3 ■ 'II 1603 I604B 

 3607, 3611, 3635H, 3663H, 3669H, 3671H, 3683H, 3684H, 3691H, 3692H I9H 



3704H, 3784,3786 II. W13H, 1014H, 1019H, 1022H, W23H, W24H, 4025H, I027H, 

 4028H, Bering Sea and Okhotsk Sea to Eonshu [sland, Japan. 



Rhizosolenia robusta N..rin.: Pritch. Bist. [nfus. ed. L Bl L861. De 



Toni, Syll. Alg. 2: 824. L894 Diatomiste 1: 109. pi. 2.f. 1-la, pi 3. 



f. l .;. L892. < astr. Rep. Voy. (hall. Bot. 2: 73. pi . L886. Cleve, Bih. 



Sv. Vet. Akad. Bandl. 1": II. L873. Brun & Temp. Mem. Soc. Phys. et Bist. 



Nat. Geneva 30': 7 i Van Beur. Tr« .414. pi SS.f. 883. - 



Though the beautiful iridescenl - abundant in the following dredging 

 complete frustule was found and very rarely a trace i f the disintegrated bands com- 

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

 specific name, robusta. 



Found at stations 2919, 2923, 2929, 3611, 1516H, Bering Sea and off southern and 

 Lower t lalifornia. 



CHAETOCEROS Ehrenb. 



Chaetoceros Ehrenb. Her. Akad. Wiss. Berl. 1844: I - Van Bern*. Synop. 



L95. pi. 81 82. 1881 5. Etabh. Fl. Alg. lair. 1: 31, 321./. 91. L864. Pritch. Hist, 

 [nfus. ed. 1.861. 1861. Bright. Quart. Journ. Micr. Sci. 4: 105. pi 7. 18 

 Bacteriastrum Shadb. Trans. Micr - rid. n. s. 2: 14. L854. Pritch. Hist. [nfus. 



ed. 1. 863. L861. 

 Hercotheca Ehrenb. Ber. Akad. Wiss. Berl. 1844: 262,269. L845; Mikr g 



XVIII. f. ,.18 

 P< iptera Ehrenb. Ber. Akad. Wiss. Berl. 1844: 270. 1845; Mikrog. pi. 33. X VIII. 



L854. Pritch. Bist. [nfus. ed. 4. 865. L861. 

 Actiniscw Ehrenb. Ber. Akad. Wiss. Berl. 1854: 237. 1855, in part. 

 Goniothecium Ehrenb. Ber. Akad. Wiss. Berl. 1844: 32 3 

 Dicladia Ehrenb. Ber. Akad. Wiss. Berl. 1844: 7::. 79. L8 

 Syndendrium Ehrenb. Ber. Akad. Wiss. Berl. 1845: 7:;. L55. - 

 Skeletonema Grun. Van Beur. Synop. pi. 83terf. 5. 1881, not Gr< 

 lallia Schutt, Ber. Deut. B< t. Ges. 13: 18. pi 5.f. *8a-b. E 

 This genus has occasioned great confusionin the nomenclature of the Diatoms 

 by reason of the peculiar mode of its growth. It is a mainly or perhaps wholly pelagic 

 form and is found in both the living sil state. It grows in long filaments, the 



single frustules of which often vary widely, especially in n the charai 



the processes or setae that adorn them. These may be, in some few instances, 

 wholly lacking, may proceed from opposite sid( - • f the zonal portions, or may encircle 

 the >ame. The terminal \ al\ i rally ornamented with p lite di ffer- 



ent from those on the intermediate frustuh -. Still further to complicate the matter, 



