MANX DIATOMS OF I M i LLBATROS6 VOYAl 283 



Auliscus pruinosus Bail. Smithson. Contr. Knowl. 7: 5. pi. I.f. > v . 1854. 



Trans. Micr. Soc. Lond. n. s. 11: 18. pi S.f. 13. L863 II I. Smith Sp. Diat. 



Typ. 706. 1874. Pritch. Hist. Infus. ed. 4. 845. pi. < 361. Schmidt, Atlas 



pi. 31. f. 6 :. //. /•; 15, pi. 3 Ratt. Journ. Roy. 



Micr. Soc. 8 : 22. L888. I »■ Toni, Syll. Alg. 2: L045. L894. M D -taf. 



pi. 51. f. 13. L890. 

 Auliscus punctatus Bail. Smithson. Contr. Knowl. 7: 5. /</. /. /. >. L854. G 



Trans. Micr." Soc. Lond. n. b. 11: 19. pi. S.f. 15. L863. Moeb. Diat.-taf. />/. 51. 



f. I L890 Schmidt, Atlas pi. 31. f. 8. L875; pi. 67. f. ) 8. L881; pi. 89. f. 



pi. 108. f. 10. L886. Ratt. Journ. Roy. Micr. 5 3 L888 De Toni, Syll. 



Alg. 2: L033. L894. 

 There is great confusion between these two species of Bailey. The original type 

 form-, as can be Been by comparing the figures of Bailey or th G ill'-, show 



considerable contrast : but at the present time one mighl as well assign a newly found 

 example to one species as to the other. Rattray has retained the two species, though 

 placing examples of .1. under .1. punctatus. The two species have no 



distinct boundary. In the single dredging in which these forms were found th< 

 very abundanl and supply every gradation between the two. Ii is to be noted, also, 

 that Bailey was in considerable doubt over the separateness of these species, and it 

 Beems to me they arc much better united. Nothing can better illustrate the li- 

 ne-- of trying to assign specimens to one as against the other than a comparison of the 

 two figures lying side by side in Schmidt*- Atlas, plate 31, figures 7 and 8, named. 

 despite their identity. " pruinosus " and "punctatus ," respectively. No wonder that 

 two such capable diatomists as Grunow and Witt should call the one pruinosus and 

 the other punctatus, the diatom represented by plate L08, figure L0, of Schmidt's Atlas. 

 Found at station 2807, Galapagos Islands. 



Auliscus stockhardtii Jan. Abh. Schles. Ges. Vaterl. Cult. 1861-: lfi:). pi 1. 



L861. Schmidt, Atlas pi. SO. f. n IS. L875; pi 67. f. 6. L881. Ratt. Journ. Roy. 

 Micr. So,-. 8-': 7. 1S88. De Toni. Syll. A1-. 2: L031. 

 Auliscus constellatus Mills, Journ. Roy. Micr. Soc. II. 1: 867. pi 11. f. : ■■. L881. 

 Auliscus racemosus Ralfs, Trans. Mice. S c. I- i d. i . s. 11: 46. pi. :. f. 9. L863. 



Schmidt, Atlas pi 67. f. 6. note. L881. Moeb. Diat.-taf. pi 50./. 9. L890. 



I am in doubt as to making A ms Ralfs a synonym of the above as Schmidt 



and Rattray have done. A1 least, a comparison of the original nisch with 



that of Halt's in the citations given above will show enough divergence to make the 



matter questionable. Certain varieties of A. pruinosus Bail, approach this species. 



Found at station 2807, Galapagos Islands. 



RHIZOSOLENIA Elirenb. 



Rhizosolenia Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: :;_ ,( .». 122. 1843; Ber. 



Akad. Wiss. Berl. 1844: 204. 1845.- kin/.. Bacill. 51. 1844; Sp. Alg. 24. 1849. 



Bright. Quart. Journ. Micr. Sci. 6: 93. pi 5. 1858, char, emend. Pritch. Hist. 



Infus. «-d. L 865. L861. Van Heur. Synop. 194. pi. 78 79. l881;Treat. Diat. 113. 

 /. 133. 1896. Griff. & Sent Micr. Diet. ed. 1. 657. pi. 51. f. - De Toni. 



Syll. Alg. 2: B23. 1894. Eng. & Pr. Pflanzenfam. l lb 84./ 1 



Perag. Le Diatomiste 1: L08. pi. i 5. I - 

 /. icampia Stolter, Journ. Hoy. Micr. Soc. 2: 835./. a d. l v >7n. nol Ehrenb. 

 Attheya West, Trans. Micr. Soc. Lond. n. 8. 8: 152. pi. 7. f. 15. I860. De Toni. 



Syll. Alg. 2: 770, 822. L892 94. Per I: 105. pi. t.f 



Van Heur. Treat. Diat. 120./. 138. L896. Eng. & Pr. Pflanzenfam. 1 : 88 



L896. 



3 midt, Atlas ■ 1875. 



