282 CONTRTBUTIONS FROM THE NATIONAL HERBARIUM. 



Eupodisciis^hvonh. in part; W. SiuiUi, Synop. Brit. Diaf. 1: 2fi.pl. ^^/. ,?,V. 185:^. 



Bright. Quart. Juiirn, Wicr. Sci. 8: 94. pi. 5. J. S. ISGO. 

 Pseudoauliscus Loud. -Fort, in part; Grev. Trans. Mic. Sue. Lond. n. s. 11: 74. pt..,. 



f. 23. 18G3. 

 Cerataulus Elirenb. in part; Jan. Abh. Schles. Ges. Vaterl. Cult. 1861=^: 15. pi. 1. 



f. 6. 18G1. 



AuKscus caelatus P>uU. SniitluHon. Contr. Knt.wl. 7: (l pi. 1 . f. 3-4- 1854. Grev. 



Trans. Micr. Soc. Lund. n. s. 11: 44. pi. 3. f. 4-7. 1SG3. Moeb. Diat.-taf. pi. 50. f. 



4-7. 1890, Schmidt, Atlas pi. 32. f. 12-20, 23-26. 1875; pi. 67./. 11-13. 1881; pi. 



204. f. 21. 189G. Pant. Beitr. Racill. Ung. 1: 57. pi. 19. f. 173; pi. 28. f. 279. 1886. 



Ratt. Journ. Boy. Micr. Soc 8^: 885-888. pi. 15. f. 5-9, pi. 16. f. 3, 6. 1888. Pritcli. 



Hist. Iiilus. ed. 4. 845. 18Gi. Lend. -Fort. Mem. Soc. l^:niul. St. Bricuc G3. pi. 7. 



/. 68. 1879. Wollc, Diat. N. A. pi. 89. f. 6, 0-10. 1890. II. L. Smith, Sp. Dial. 



Typ. 54. 1874. Bo Toui, Syll. Alg. 2: 1049. 1894. 



Auliscus smithii hin. Abli. Schles. Ges. Vaterl. Cult. 1861': 1G3. pi. 2.f. 9. 18G1. 



Auliscus (jrcfjorii Jan. Abh. Schles. Gos. Vaterl. Cult. 1861'^: 163. p/. 2./. 12. 18G1. 



Aulisms sculptus Kalis, in part; Leud.-Fort. Mem. Soc. Emid. St. Bricuc pi. 7. 



f. 66-67. 1879. 

 This species exhibits more variability in its markings than most other members of 

 Auliscus, a genus which I think sliows a greater elasticity in this respect than any 

 other. This has created a strong temptation to multiply named and accredited varie- 

 ties, so that the species is quite confuted with them. De Toni« enumerates fifteen 

 such, of which Rattray is the author of eight. Did the present writer favor this 

 method of extending nomenclature he could greatly enlarge this list out of the largo 

 mass of individuals of this species afforded by these investigations. Thus a numl>er 

 of verv striking varieties, with feathery instead of anastouKJsIng lines, were found 

 at Htations 2920II and 8712II— the varii^y called sirigillata at station 2807 and that 

 called lakcostata at statinn 2835 and others. The fact is that liailey 'u type form is not 

 at all typical of the diatoms at present assi^med to this species, but represents a rathei- 

 extreme and severe phase of ornamentation only rarely met with. The significance 

 of the specific name, caelatus, moaning carved, is therefore not particularly applica- 

 ble, liowever well it apjjlicd to Ihe original specimens. AltlioTigh A. pruinosvs J5ail. 

 is typically a very dii'ferent diatom from this species, the two have come closely to 

 approach each other by ri^ason of the varieties assigned to them; and on the other 

 side this species passes impc^rceptibly into A. scidplus (W. Smith) Ralfs. 



Found at stations 2807, 2835, 2920H, 3712II, Galapagos Islands, to Lower Califtniiia, 

 Hawaiian Islands, and Okhotsk Sea. 



Auliscus hardmanianus Grev. Trans. Micr. Soc. T.ond. n. s. 14: (>. pi. ^./. 77. 18(i(>. 

 Moeb. Diat.-taf. pi. 71. f. 17. 1890. Sclunidt, Atlas pi 67. f. J. 1881; pi. 108. f, 

 1. 188r^. Truan & Witt, Diat. Ilayti, 12. pi. t.j. 4- 1888. Ratt. Journ. Roy. Micr. 

 Soc. 8^: 17-18. 1888. De Toni, Syll. Alg. 2: 1011. 1894, 

 Auliscus joynsonii Schmidt, Atlas pi. 67. f. t. 188L 



Rattray gives also four named varieties, Tlie A. joynsonii of Schmidt is an unim- 

 portant variety. 



Found at station 2807, Galapagos Islands. 



AuUs'cusinsignisCleve, Sv.Vet. Akad. TIan<ll. 18^^': 22. pi. 5.f. 64a b. 1881, Schmidt, 

 Atlas pi. 89. f, /. 1886. Ratt. Journ. Roy, Micr. Soc. 8^: 15. 1888. De Toni, Syll. 

 Alg, 2: 1089. 1894. 

 Both th(^ above illustrations are v(^ry poor. Cleve^s material, like my own, was 

 f>'om the Galapagos Islands. 



Found at station 2807, Galapagos Islands. 



a Syll. Alg. 2: 1049. 1894, 



