282 >NTBIBUTIONS PROM l III NATIONAL HERBARIUM, 



nnl>. in part; SV. Smith, Synop. Brit. Diat 1: 25 pi 



| | , • ■ , j ' s 



I :!.-!•'■ rt. in pari Mi So< I I. n. s. 11: 74 



- 

 \a Uu* Ehrenb. in part; Jan. Abh. Bchles. Ges. Vaterl. Cult. 1861'-': 16. pi. i. 

 f. ■ . L861. 



Auliscus caelutus Bail. Smithson. Coiitr. Knowl. 7: 6. pi. l.j L854. l 



Trans. Micr. Soc. Lond. n. s. 11: 14. pl.t. J 7.1863. Moeb.Diat.-taf.pl 



L890 Schmidt, Atlas pi. St. J. lt-tO, < L875 pi. 67. f. 11-13. 1881; pi. 



Pant. Beitr. Bacill. Ung. 1: 57. pi. /''./'. /;.;.-,,/. L886. 



Ratt. Journ. Roy. Micr. Soc. 8 : - >. pi. 16. f. • L888. Pritch. 



Hist. [nfus. ed. I. B45. L861. Leud.-Fort. Mem. Soc. Emul. St. Brieuc •-:;. pi. :. 



i 68. L879. Wolle, Diat. X. A. pi. 89. f. 6, 9 10. L890. II. I.. Smith, Sp. Dial. 



Typ. 54. L874. !>•■ Toni, Syll. Alg. 2: L049. 1894. 



Auliscus smitkiiJan. Abh. Schles. Ges. Vaterl. Cult. 1861 : If.:;. pi. :. f. 9. L861. 



.1-// - Jan. Abh. Schles. Ges. Vaterl. Cult. 1861-': It;:;. pi. .'./. it. L861. 



i liscus 8culptus Ralfs, in part; Leud.-Fort. Mem. Soc. Emul. St. Brieuc pi. 7. 



Tl ii- species exhibits more variability in its markings than mosl other members of 

 Auliscus, a genus which I think shows a greater elasticity in this respecl than any 

 other. Tin- ha- created a strong temptation i«» multiply named ami accredited varie- 

 ■ that the species is quite confused with them. De Toni" enumerates fifteen 

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

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

 mass of individuals of this species afforded by these investigations. Thus a number 

 of very striking varieties, with feathery instead of anastomosing lines, were found 

 at stations lmil'oII and 3712B the variety called strigillata at Btation 2807 and that 

 called latecostata at station 2835 and others. The fact is thai Bailey 't type form is not 

 at all typical of the diatoms at present assigned to this species, but represents a rather 

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

 of the specific name, caelatus, meaning carved, is therefore nol particularly applica- 

 ble, however well it applied to the original specimens. Although .1. pruinosus Bail. 

 is typically a very different diatom from this Bpecies, the two have come closely to 

 approach each other by reason of the varieties assigned to them: and on the other 

 Bide this species passes impercepl ibly into .1. sen I pi us (W. Smith) Half-. 



Found at stations 2807, •_ , ^'.-">. 2920H, 3712H, Galapagos Islands, to Lower California. 

 Hawaiian Islands, and < Okhotsk Sea. 



Auliscus hardmanianus < ire\ . Tran-. Micr. Soc. Lond. n. s. 14: 'i. pi. .'. 



Moeb. Diat.-taf. pi. 71. f. 17. L890. Schmidt, Atlas pi. 67. f. I. 1881 



/. L886. Truan & Witt. Dial. Bayti, L2. pi. .'./. ',. L888. Ratt. Journ. 



Soc. 8 ; : 17 Is. L888. De Toni. Syll. Alg. 2: KM I. L894. 



Auliscus joynsonii Schmidt, Atlas pi. 67. f. ' L881. 



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

 portant variety. 



Pound at station 2807, Galapagos Islands. 



Auliscus insignis<le\e. Sv.Vet. Akad. Eandl. 18 5 :22. pi. 5./. 64a l>. 1881. Schmidt, 

 Aila- pi .89. J .1. L886. Ratt. Journ. Roy. Micr. Soc. 8 2 : 15 L888 DeToni,Syll. 

 Ml:. 2: L039. L894. 

 Both the above illustrations are very poor. Cleve's material, like my own, was 

 )'•■ in the ( ralapagos Islands. 



Pound at Btation 2807, Galapagos [slands. 



./'• " 



. L866. 



pi- 



108. /'. 



Roy 



. Micr. 



Syll. Alg. 2: L049. L894. 





