A Bevision of the Genus Auliseus Ehrb., &e. By J. Battray. 897 



mud at Norderney, from Jahde mud near Hochsiel Jeverland, and 

 from sand at the mouth of the Tajo. — Conf. Kalfs in Pritch. Inf., 

 p. 846 ; Grev. Trans. Mic. Soc. Lond., 1863, p. 52. 



A. foly stigma Ehrb., Mon. Ber. Ak., 1844, p. 77, has not been 

 adequately defined. Ehrenberg only noted that the valve had "cellules 

 or apiculi " equal, small, disposed without order, and not contiguous. 

 His specimens were from Ems mud near Weimar. Kiitzing added 

 that it differed from Coscinodiscus radiolatus in having a little larger 

 radiating markings — about 7 instead of 9 in 0*01 mm. — converging 

 in two lateral whorls, and recorded it as fossil in North America. It 

 is identical with Coscinodiscus polystigma Ehrb., i\Ion. Ber. Ak., 1843, 

 p. 271, and Auliseus 'polystigmus Kalfs, in Pritch. Inf., p. 846. Conf. 

 Grev. Trans. Mic. Soc. Lond., 1863, p. 52. 



A. fulvus Kaben., Flor. Europ. Alg. aq. dulc, p. 320, is Eupodiseus 

 fulvus W. Sm. (Syu. Brit. Diat., i. p. 24), and was correctly referred 

 by Kalfs to Actinoeyelus. 



I am unacquainted with A. granidatus Bail, and A. quadriceps 

 Bail., which occur, according to Habirshaw, in the collection of 

 Prof. Bailey, but remain nomina nuda. 



Artificial Key. 



1. Processes six, two large mammillate, two smaller at ends of 



transverse area, and two at considerable unequal distances 

 from the corresponding sides of the large ones. Markings 

 pruinose strise ; a clear cui'ved band at outer ends of trans- 

 verse areas dissimilis. 



No such processes 2 



2. A clear concavo-convex space on inner side of each process . . lacunosus. 

 Two clear spaces between each process and the central space, 



that nearer the centre long, narrow fenestratus. 



No such clear areas 3 



3. Valve with three distinct zones. Markings costate, star-shaped 



at centre stelliger. 



No such zones 4 



4. Markings areolate, unequal, large, pearly ; processes low, broad. 



Transverse median areas obscure fractus. 



Markings areolate, unequal, large, pearly ; processes low, broad. 



Transverse median areas prominent, obovate convolutus. 



No such markings 5 



5. A marginal band of large lanceolate markings mirabilis. 



No such marginal band 6 



6. Striae short, distant, flexuous, irregular but distinct .. .. pressus. 

 No such striae 7 



7. Processes close to the central space 8 



„ much nearer border 9 



8. Apiculate , 10 



Non-apiculate 11 



10. Striae converging to the processes evident, elsewhere obscure .. accedens. 

 Markings obscure throughout propinquus. 



11. Markings minute, round, granular, most evident towards 



border, rows radial Eattrayi, 



„ large round granules, rows inconspicuous, radiating 



and diverging rohustus. 



9. Central space diamond-shaped 12 



„ „ not diamond-shaped 13 



12. Transverse areas absent , 14 



„ „ present 15 



