374 Transactions of the Society. 



narius Ehrb., ibid., 1844, p. 81 ; Eupodiscus quinarius Ehrb., ibid., 

 1844, p. 81 ; Eupodiscus monstruosus Ehrb., ibid., 1844, p. 81 ; 

 Tetrapodiscus monstruosus Ehrb., ibid., 1844, p. 8L; Eupodiscus 

 Argus Smith, Syn. Brit. Diai, i. p. 24; Sch. Atl., pi. xcii. figs. 7-11 ; 

 Van Heurck, Syn. d. Diat. d. Belg., p. 209, pi. cxvii. figs. 3-6 ; 

 Sch. Atl., pi. xcvii. figs. 7-11 ; Eupodiscus americanus Ehrb., fide 

 Ealfs in Pritch. Inf., p. 843. 



Habitat: Kichmond, Va., Petersburg, Va., Piscataway, Md. 

 (Ehrenberg) ; Patagonian guano (Janisch) ; Cuxhaven, Gliickstadt, 

 Hamburg (Ehrenberg) ; Thames near Gravesend (Poulton, Iloper) ; 

 near Faversham (Shadbolt) ; Isle of Dogs (Roper) ; River Orwell 

 near Ipswich (Hodgson) ; Medway (Dallas) ; coast of France (de 

 Brebisson) ; coast of Holland (Suringar) ; coast of Denmark (Heiberg) ; 

 Charleston Harbour, N. America (Bailey) ; Ascidia, Hull (Greville ! 

 Gregory) ; Ascidia off Flamborough Head (Norman !) ; stomach of 

 oysters, Humber (Dickie !) ; stomach of mussel (loc. ?) (Dickie !) ; 

 Noctiluca miliaris (Baddeley). 



A. Thumii Sch. Atl., pi. cii. fig. 8. — Diam. ■ 185 mm. Surface 

 flat to, and slightly angular at, zone of processes; slope to border 

 gentle. Colour dark grey, becoming almost opaque about zone 

 of processes. Central space indistinct. Markings round or oval 

 and oblique granules, most brilliant in the meshes of the reticulum, 

 moniliform towards border, in radial rows that are indistinct between 

 centre and semiradius ; interspaces irregular, most evident towards 

 the centre. Reticulum evident, the meshes rounded, a single band at 

 border, with much larger meshes separated by stronger radial lines. 

 Primary rays evident, the rows diverging but slightly at outer ends. 

 Border well marked, striae 8 in "01 mm., about 1/12 of radius broad, 

 outer edge sometimes irregular. Processes 5 or 6, large, insertion 

 1/4 to 1/5 of radius from circumference, proximal portion with sides 

 convex, converging outwards, distal subcylindrical, constriction slight, 

 free ends convex, length 2 to 3 times greatest breadth, clear space 

 at base evident. 



Habitat : Sta. Monica deposit (Thum !). 



§ 11. Blanditi. 



Inflations sometimes distinct. Markings polygonal. Primary 

 rays well marked. 



(a) Processes small. 



A. concinnus Kitton MS. — Diam. • 1 to • 1075 mm. Surface 

 flat for about 5/8 of radius, with outer edge indistinct, slope to border 

 gradual, sometimes slightly convex at centre. Colour blue to some- 

 what beyond semiradius, beyond this smoky grey. Central space 

 minute, angular, 1/40 to 1/43 of diam. broad. Markings subequal 

 on central portion, 6 in O'Ol mm., decreasing gradually to border, 

 sometimes largest on median zone, rows radial, straight, secondary 

 oblique rows inconspicuous. Primary rays 4, cruciform, distinct, 



