A Revision of the Genus Auliscus Ehrh., &c. By J. Battray. 913 



larger and siibequal to the border; irregular at tlie centre, beyond 

 this in evident, regular, concentric bands. Border narrow, hyaline. 

 Processes 4, roundly elliptical, placed close to the border, about 

 0*0075 mm. broad. 



Habitat : Cambridge deposit, Barbadoes (Johnson). 



§ 2. NOBILES. 



Markings fasciculate, evident. Border prominent. 

 E. radiatus * Bail. Smiths, Contrib., 1851, Art. 8, p. 39. 



Diam. from 0"04:5 to 0*1175 mm. Surface flat, slope at border 

 gentle. Blarkings hexagonal areolae, 4 in 0*01 mm., subequal, in 

 subradial, almost straight rows arranged in fasciculi, a single distinct 

 band of smaller areolae around the processes, and of larger somewhat 

 unequal ones around the border. Border narrow, striae delicate, 14 

 to 16 in 0*01 mm. Processes 4, central portion hyaline, rounded, 

 about 0*0075 mm. broad. — Aulacodiscus radiatus Brightw., Quart. 

 Journ. Mic. Sci., 1860, p. 95, pi. v. figs. 10a, lOh (not Aulacodiscus 

 radiatus Grev., Trans. Mic. Soc. Lond., 1864, p. 11, pi. i. fig. 4) ; 

 Kalfs in Pritch. Inf., p. 843 ; H. L. Smith, Diat. Spec. Typ., No. 164 ; 

 Van Heurck, Typ. Syn. Diat, Belg,, No. 509. 



Kalfs states that the processes may be more than 4, as formerly 

 doubtfully asserted by Bailey. I have only seen specimens with 4. 



Habitat : Soundings, South Atlantic, 2835 fathoms (H. L. Smith !) ; 

 South America (Van Heurck !) ,* rice-fields, Greorgia (Norman !) ; 

 sand from Kamortha, Nicobar Islands (Frauenfeld) ; shell cleanings 

 (Doeg ! t) ; Colon (Hardman !). 



Var. humilis. — Diam, * 045 mm. Surface slightly convex between 

 the processes. Markings sometimes forming fasciculi only between the 

 centre and the processes, the rows in the fasciculi converging to the 

 processes, elsewhere the secondary oblique rows more evident ; no 

 distinct band around the processes or border ; apiculi 2, inserted near 

 the border, long, narrow, and equidistant, on opposite sides of the 

 valve from the processes. Processes 2, conical, with obtuse free ends. 



Habitat : Eiver Orwell ( W. Smith !) ; Med^ay (Dallas !). 



E. hardmanianus Grev., Trans. Mic. Soc. Lond., 1866, p. 80, 

 pi. viii. fig. 14. 



Circular, rarely irregularly oval, diam. from 0*0925 to 0*16 mm. 

 Surface flat or slightly convex at the centre, the outer half flat. 

 Colour pale grey. Markings hexagonal areolae, subequal, 4 in 

 * 01 mm., irregular, on a small central area outside of this in straight 

 or substraight, subradial, fasciculate rows. Border broad, somewhat 

 elevated, its inner edge irregular, with remote, irregular, coarse radial 

 striae and delicate intervening stri^, 8 in * 01 mm. Procecses 4, 



* Not E. radiatis W, Sm., see p. 915, t In the Collection of Dr. Griffin. 



