A Revision of the Genus Auliscus Ehrh., &g. By J. Rattray. 883 



external area straight and radial between those passing obliquely out- 

 wards from the processes, at the inner edge of the external area a band 

 of evident round granules with hyaline interspaces. Processes 4, 

 symmetrical, 2 smaller at the ends of minor axis, elHptical, about 

 • 003 mm. broad. 



Habitat : Campbell Island, N. Zealand (Petit). 



§ 10. COSTATI. 



Transverse median areas with outer ends rounded, rarely indistinct. 

 Markings narrow, continuous, distinct, widely arranged costse and 

 delicate striae around border, transverse areas often punctate, some- 

 times with a faint reticulum near their outer ends. 



A. incertus Sch. Atl., pi. Ixxxix. figs. 18, 19. 



Elhptical, major axis about ' 05 mm., from 1^ to 1|- times minor. 

 Surface rising slightly from central space to processes, transverse 

 median areas indistinct or absent. Colour pale grey. Central space 

 circular, distinct, from 0'0045 to 0'0075 mm. broad. Markings 

 distinct strias, those converging to the processes distant, the others 

 diverging, straight along the minor axis, elsewhere convex towards the 

 processes, puncta sometimes distinct between the central space and 

 outer limits of the converging strias. Processes 2, subcircular, from 

 0-0075 to 0-012 mm. broad. 



Habitat : Santa Monica (Eae !) ; Balearic Islands (Weissflog) ; 

 Newcastle deposit, Barbadoes (Firth !) ; Moron deposit (Firth !). 



A. ohscurus sp. n. 



Elliptical, major axis - 04 mm., about l-^^^ times minor. Surface 

 rising steeply near the processes, transverse median areas indistinct, 

 with outer ends rounded close to border. Colour hyaline. Central 

 space round, indistinct, 0-005 mm. broad. J\Iarkings delicate striae 

 converging to processes, elsewhere the striae radial, straight or slightly 

 curved, more distinct around the border, most crowded at the outer 

 portion of the transverse areas. Processes '2, prominent, conical, with 

 sides straight or slightly convex at the base, the apices rounded ; the 

 inner side obscure. 



Habitat : Zanzibar (Weissflog !). 



A. sculptus Kalfs in Pritch. Inf., p. 845, pi. vi. fig. 3. 



Major axis 0-055 to 0-0875 mm., from i^ to lyig- times minor. 

 Surface rising slightly near the processes, transverse median areas 

 distinct, with outer ends regularly rounded. Colour pale grey. 

 Central space rounded, O'Ol to 0-0125 mm. broad, sometimes 

 elongated in direction of processes. Markings distant, the lines con- 

 verging to the processes distinct, those on transverse areas radiating, 

 straight or slightly curved, around their ends flexuous and almost 

 parallel to the edge, near border convex towards processes. Processes 



