A Revision of the Genus Auliscus Ehrh., &c. By J. Battray. 905 



processes and around the border. Processes 4, subcircular, about 

 • 0175 mm. broad, their circumference with minute irregularities, the 

 central portion distinctly punctate. 



Habitat : Cambridge deposit, Barbadoes (Johnson !) ; Cebu, 

 Philippine Islands (Cleve !) ; Labuan (Cleve !). 



P. jolmsonianus. — A. johnsonianus G-rev., Trans. Mic. Soc. Lend,, 

 1863, p. 51, pi. iii. fig. 20. 



Subcircular, diam. • 0775 mm. Surface with low mammillations 

 beneath the processes, the space between these sloping gently to the 

 border. Colour pale smoky grey. Markings minute, punctate, 

 irregular at the centre, about half-way between the centre and the 

 processes in oblique irregular short lines, on the mammillations in 

 gets of radial slightly curved striae, and on the middle of the inter- 

 vening space in radial finely flexuous rows, more faint towards the 

 border. Processes 4, symmetrical, circular, about ' 0075 mm. broad, 

 their border with distinct radial striae. 



Habitat : Cambridge deposit, Barbadoes (Johnson ! Grreville !). 



Var. eludens. — Diam. " 065 to • 07 mm. Surface with diamond- 

 shaped central area well defined, no mammillations beneath the pro- 

 cesses. Colour almost hyaline. Markings on central area more 

 delicate obscure puncta, striae converging to the processes faint. 

 Processes 4, with narrow non-striated border. 



Habitat : Springfield deposit, Barbadoes (Doeg !). 



P. elaboratus. — Auliscus elaboratus Ealfs, Trans. Mic. Soc. Lond., 

 1863, p. 51, pi. iii. fig. 19. 



Circular, diam. • 075 to • 125 mm. Surface flat on central 

 area, rising somewhat towards each process. Colour pale smoky grey. 

 Central area indistinct, triangular, its sides concave between the inner 

 ends of the curved striae. Markings punctate on the central area, 

 largest at its centre, deHcate non-flexuous stricB curving from the 

 outer edges of this area to the zone around the processes ; this zone 

 with its outer edge rounded, about • 01 mm. broad, bearing delicate 

 closely-placed irregular puncta or faint striae, which converge around 

 the processes, at its inner edge faint radial flexuous stri^, diverging 

 towards the border, at the middle of the area between the adjoining 

 processes. Processes 3, circular, about • 016 mm. broad, the border of 

 each faintly striated. 



Habitat : Cambridge deposit, Barbadoes (Johnson !) ; Bridgewater 

 deposit, Barbadoes (Johnson !) ; " Barbadoes " (Greville ! Cleve !) ; 

 Chalky Mount, Barbadoes (Firth !). 



P. trigemmis. — Auliscus trigemmis Sch. Atl., pi. cxxv. fig. 16. 



Circular, diam. • 1075 mm. Surface flat, slightly convex at border. 

 Colour pale smoky grey. Markings punctiform, scabrous, closely 

 placed but without order. Border broad, sharply defined, hyaline. 

 Processes 3, symmetrical, circular, about 0-025 mm. broad, their 



