142 E. GROVE AND G. STURT ON 



ably eccentric. Differs from Aiiliscas chiefly in having one process 

 only. 



M. inammosa, n. sp., Gr. and St. — Valve circular, with broad, 

 flat, finely striated border (stria? about 55 in 001"), from which 

 arises a highly convex expansion, terminating in a large circular 

 process, on which are two rings of large dots. The process is not 

 central, but is situated much nearer one side of the valve than the 

 other, and somewhat resembles the mouth of a sack or bag tied up 

 and leaning to one side. The surface of the expansion is covered 

 with markings resembling those of Auliscus pruinosus, converging 

 to the base of the process. Diam. -003". Rare. (PI. XIII, Fig. 38.) 



Huttonia, n. gen., Gr. and St. — We place under this name two 

 species which appear to differ from those of any existing Genus, 

 but further observation is necessary before we can define the Genus 

 in which we propose to place them, and which we have named after 

 Prof. Hutton, of Christchurch, New Zealand. 



H. alternans, n. sp., Gr. and St. — Valve oblong with rounded 

 ends, moderately convex, having at the ends, on the alternate sides, 

 flattened appendages, which have somewhat the appearance of 

 processes viewed laterally. Surface of valve covered with fine 

 puncta. Length to -0063". (PI. XIII, Fig. 39.) 



H. virgata, n. sp., Gr. and St. — Valve similar to the last in out- 

 line, but with much coarser puncta, which are interrupted by broad 

 transverse clear spaces irregularly placed. Length of the only 

 specimen observed •0042". (PI. XIV, Fig. 55.) 



Actinoptychus {glabratus var.?) elegantulus, n. sp., Gr. and St. — 

 Valve small, with large clear centre, from which hyaline rays extend 

 for some distance between each compartment. Margin hyaline, 

 with large clear spaces between each process. Processes small, 

 seated on a small, crescent-shaped, hyaline space, connected with 

 the centre by a narrow ray. Surface of the undulations covered 

 with delicate decussating lines of strife. Rare. Diam. *0025". 

 (PI. XIII, Fig. 40.) 



A.pulchellvs, Grun., var. tcncra. — Small, with numerous compart- 

 ments, and a large clear centre. The undulations are conspicuous, 

 and the small but distinct processes arc situated in small clear 

 spaces at the ends of the elevations, which terminate abruptly. 

 On the summit of each elevation is a clear radial line, the 

 remainder of the surface being covered with fine decussating stria?. 

 (PL XIII, Fig. 41.) 



