894 Transactions of the Society. 



Var. decipiens. — Irregularly elliptical or Rul)nval, major axis 

 0'0575 mm., about 1} times minor. Surface with transverse metliau 

 areas indistinct, the outer ends about half of semi-minor axis from 

 centre. Markings minute, punctate, a few short faint irregular striae 

 converging to the processes ; apiculi indistinct or absent. Processes 

 2, round, 0075 mm, broad. 



Habitat : Ceylon (WeissQog !) ; Los Angelos (Hardman !) 



A. reticulatus Grev. Trans. Mic. Soc. Lond., 1863, p. 46, pi. ii. 



fig. 10. 



Roundly elliptical, major axis * 0725 mm., about 1 ^Ij times minor. 

 Surface rising gradually from centre to processes, the central portion 

 sharply defined, extending to outer side of processes, widest opposite 

 the central space, reaching to 4 jo of radius from centre. Colour pale 

 grey. Central space round, distinct, 0* 0125 mm. broad. Markings 

 evident, strise converging to the processes sometimes with minute 

 lateral protuberances, rarely anastomosing on the central portion, but 

 between the converging sets more faint with frequent anastomoses, 

 around the border distinct, straight, or sliglitly bent, distant. Pro- 

 cesses 2, small, outer end rounded, about 0* 01 mm. broad, — Sch. Atl,, 

 pL XXX. figs, 1-3. A. reticulatus var., Sch. Atl., pi. xxx. fig. 4. 



Habitat : Zanzibar (Weissflog !) ; Bass Straits (Johnson !) ; 

 scrapings from Haliotis shells, Peru (Grove !) ; llolothurians, Cali- 

 fornia (Kinker !) ; Pied Sea (Grunow) ; Peru and Amboyna (Grove). 



Var. quadrisignata Sch. Atl., pi. xxx. fig. 5. — Major axis 

 0*05 mm., about 1^ times minor. Markings: stria) converging to 

 processes less evident, reticulum on transverse areas faint but evident, 

 on 2 or 4 small subsymmetrical areas more prominent. 



Habitat : Campeachy Bay (Weissflog !) ; Auckland (Cleve). 



Var. capensis Sch. Atl., pi. xxx. fig. 6. — Major axis • 07 mm., 

 about lyY times minor. Surface with central portion extending to 

 middle of processes, its protuberant lateral portion nearer the border. 

 Markings : striae converging to the processes more distant and irregular, 

 a reticulum faint and only on lateral protuberant parts of central 

 portion. Processes oval, long axis directed straight or obliquely 

 tow'ards centre. 



Habitat : Cape of Good Hope (Schmidt). 



A. compositus Sch. Atl., pi. xxx. fig. 9. 



Eoundly elliptical, major axis • 1825 mm,, about 14 times minor. 

 Surface rising slightly towards the processes, elsewhere almost flat ; 

 a distinctly defined, irregularly oval, subsymmetrical, median area, 

 extending to, and with long axis in Hue of, processes, its minor axis 

 from 1/2 to 3/5 of that of the valve. Colour light smoky grey. 

 Central space circular, about 0*015 mm. broad. Markings: around 

 central space a band of large, somewhat obconical, unequal, mostly 3- 

 or 4-sided areolae, reaching from 1/2 to 3/5 of minor axis of median 

 area, on the remainder of this area an irregular reticulum with meshes, 



