904 Transactions of the Society. 



harhadensis Grev., ibid., 1864, p. SS, pi. sii. fig 4. Aidisciis cellidatus 

 Grev., M.S. in Coll. 



Habitat : Nottingham, Maryland (Johnson ! GriflSn !) ; Cambridge 

 deposit, Barbadoes (Johnson! Ilardman!) Bridgewater deposit, 

 Jiarbadoes (Johnson !) ; liio Janeiro (Hardnian !) ; Colon and Calvert 

 County, Maryland (Kitton) ; Galapagos Islands (Cleve). 



P. sjyinosus. — Auliscus sjntiosus F. Christian, Sch. Atl., pi. cxxv. 



fig. 2. 



Circular, diam. • 0925 to • 145 mm. Surface rising gradually 

 from the centre for about 2/3 of radius to the highest zone, the latter 

 sharply defined on inner, less distinctly on outer side, about ■ 0075 

 mm. broad, slope to the border gentle. Colour pale grey. ]\[arkings 

 minute, pol3'goual, 10 to 12 in O'Ol mm., without interspaces, rows 

 radial, secondary, indistinct, concentric rows visible on the highest 

 zone, strine converging to the processes short, distant, well marked ; 

 apiculi minute, irregularly scattered on the highest zone, a faint 

 irregular reticulum on the outer portion of the depressed central area, 

 and irregular short radial lines on the slope around the border. 

 Processes 2, round, 0'0125 to 0'0175 mm. broad, close to border. — 

 Aiiliscus Febigerii Cleve MS. 



Grunow and Schmidt justly regard this species as hardly referable 

 to Aidiscus, but have not proposed its union to another genus. 



Habitat : Nottingham deposit at West liiver (Febiger !* Deby !) ; 

 Cambridge deposit, Maryland (Deby !). 



P. ornatus. Aidiscus ornatus Grev., Trans. Mic. Soc. Lond., 1864, 

 p. 88, pi. xii. fig. 2. 



Subcircular, diam. • 0575 mm. Surface flat. Colour pale smoky 

 grey at centre, towards border hyaline. Markings minute, punctate, 

 irregularly disposed, largest towards the centre, near the border faint, 

 short faint strioe visible at the edge of the processes. Processes 5, 

 circular, about O'Ol mm. broad, their circumference with minute 

 irregularities. 



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

 (Cleve !). 



P. nehulosus Kattr. (not Leud.-Fort.).! — AuUscus nehulosus Grev., 

 Trans. Mic. Soc. Lond., 1863, p. 74, pi. v. fig. 21. 



Circular, diam. 0*0875 mm. Surface rising slightly to the 

 processes. Colour pale grey to hyaline. Markings delicate striae, 

 those converging to the processes meeting at the centre, and at the 

 middle of the space intervening between the processes, least distinct 

 towards the centre ; apiculi few, irregular, chiefly between the 



* la the Collection of Herr E. Weissflog. 



t The name nebulosus has been used by Leudugcr-Fortmorel for a different form, 

 ■which more properly belongs to Eupodiscus (see p. 912). 



