A Revision of the Genus Auliscus Ehrh., &e. By J. Rattray. 907 



Processes 2, round, about • 0015 mm. broad, but little elevated above 

 the level of the adjoining surface. 

 Habitat : Leton Bank (Janisch). 



P. anceps sp. n. 



Subcircular, diam. • 0825 mm. Surface subplain, rising some- 

 what at tho processes, sometimes a cle irer area, much more convex, 

 and reaching closer to the border on one side than on the other, ex- 

 tending between the processes. Markings subpruinose, irregularly but 

 inconspicuously and closely disposed radial striae, those converging to 

 the processes short, more distinct ; apiculi nuoierous, minute, irregular, 

 most crowded on the outer half of the valve, absent towards the centre. 

 Processes 2, circular, about 0"0125 mm. broad, their border narrow, 

 the circumference smooth. — PL XV. fig. 4. — Auliscus Grovei Cleve 

 MS. in Coll. 



Habitat : Oamaru deposit (G-rove ! Cleve !). 



P. diffusus sp. n. Sch. Atl., pi. cxxv. fig. 10 (without name). 



Circular, diam. from 0"075 to 0"1125 mm. Surface subplain, 

 processes low. Colour pale smoky grey. Markings minute, punctate, 

 closely disposed, irregular or in faint radial or oblique rows ; apiculi 

 numerous, most crowded towards the border, absent from a central 

 circular area, about 0*0175 mm. broad. Processes 2, oval, with the 

 narrower end directed towards the centre, sometimes more nearly 

 circular, about 0*02 mm. broad, their border with distinct radial 

 punctate striae, their circumference rough. — Auliscus punctatus var. ? 

 or n. sp. ? Cleve MS. in Coll. 



I have not observed the small central space shown in Schmidt's 

 figure. 



Habitat : Oamaru deposit (Grove ! Hardman ! Cleve !}. 



P. rotatus sp. n. 



Circular, diam. • 075 mm. Surface subplain, the central area 

 clear, pentagonal, with sides deeply concave outwards, and angles 

 obtuse, extending outwards to processes. Colour pale grey. Markings 

 minute, punctate, obscure, least evident on the central area, without 

 order, striae converging to processes absent, non-apiculate. Pro- 

 cesses 5, symmetrical, circular, " 01 mm. broad, their border narrovr. 

 —PL XVI. fig. 7. 



Habitat : Chalky Mount, Barbadoes (Firth !). 



Artificial Key. 



1. Processes 3, large, circular, their central portion with evident 



radial striae extending to their border trigemmis 



No such processes 2 



2. Highest zone distinct, sharply defined on inner side and apicu- 



late ; markings minute, granular, in secondary concentric 



rows on the highest zone , spinosus 



