9 1 Transactions of the Society. 



eviJeut strife. Processes 1 to 4, circular or rcuudly elliptical, with 

 major axis radial or at right angles to the radius, sometimes small, 

 inserted close to or a short distance within the border. — Aiilacodiscns 

 Brightw. pro parte, Quart. Journ. Mic. Sci., 1860, p. 95. 



§ 1. HUMILES, 



IMarkings in radial, sometimes concentric or oblique rows or 

 without order. Border simple. 



E. triocidatns Grov., Trans. Mic. Soc. Lond,, 18(54, p. 88, pi. xii. 

 fig. 3 ; Van Heurck, Syn. Diat. Belg., pi. cxviii. fig. 8, 



Diam. from " 0525 to • 0825 mm. Surface almost fiat. Colour 

 pale grev. jMarkings delicate unequal areohi3, about 2^ to 3 in 

 O'Ol mm., disposed without order, an indistinct band surrounding 

 each process. Border indistinct. Processes 3, circular, about 

 • 01 mm. broad, insertion near border. 



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



E. oculatus Grev., Trans. Mic. Soc. Lond., 1862, p. 90, pi. ix. fig. 3. 



Diam. from 0*05 to 0"15 mm. Surface flat or sHghtly depressed 

 at centre, with the highest zone indistinctly defined, extending 

 between the processes and sloping gently outwards to border. Colour 

 dark grey. JMarkings irregular polygonal areolae, about 3^ to 4 in 

 0*01 mm., largest at the centre, decreasing gradually towards the 

 border, somewhat pearly, strongly marked, disposed without order within 

 zone of processes, and in faint, oblique, curved, decussating rows near 

 the border; short delicate radial striae, 8 to 10 in 01 mm. around 

 inner edge of border. Border distinct, from 1 /lO to 1 /1 5 of radius broad, 

 its inner wider portion hyaline, the outer with a single band of closely 

 disposed granules. Processes 2, subcircular or radially elliptical, from 

 0*01 to 015 mm. broad, insertion about 2/3 of radius from centre. 



Habitat: ^lonterey Stone (Johnson! Kitton ! Grifiiu !) ; Santa 

 ]\Ionica deposit (Kitton ! l>ae ! f Griffin I) ; " Monterey " (Hardman !) ; 

 Los Angelos (Hardman !). 



E. simplex Grev., Trans. Mic. Soc. Lond., 1863, p. 73, pi. iv. fig. 20. 



Diam. from 075 to 0"17 mm. Surface flat. Markings sub - 

 equal, hexagonal areolae 4 in 0"01 mm., without a central dot, dis- 

 posed in straight or slightly curved oblique deiussating rows, no 

 distinct band around processes or border ; apiculi numerous, pro- 

 minent, somewhat irregular, forming a single baud close to the border. 

 Border narrow, hyaline. Processes 2, subcircular or roundly oval 

 with long axis subradial, from 0125 to 0*0175 mm. broad. 



Habitat : Cambridge deposit, Barbadoes (Johnson !) ; " Bar- 

 badoes " (Greville !). 



* In the Collection of Dr. Greville. 



t In the Collection of Dr. Joim Murray, Edinburgh. 



