10 E. GROVE AND G. STURT ON 



G. scintillans, A. Schm. (" Atl.," PI. 80, Fig. 7).— A variety 

 rarely occurs; one observed with 14 processes. 



Auliscus mcemosus, Ralfs. (Grev. in "T. M. S." Vol. xi, p. 46, 

 PI. 2, Fig. 9 ; Schm., " Atl.," PI. 30, Fig. 12, 13). Small and 

 scarce. 



A. pruinosus, Bail. (Grev., loc. cit., p. 48, PI. 3, Fig. 13). — In 

 addition to the radiating lines, the surface is slightly punctate, 

 corresponding with the figures of A. punctatus, Bail., in " Atl.," 

 PI. 31, Fig. 8, 9. Scarce. 



A. notatus, Grev. ("T. M. S.," Vol. xiii, p. 5, PI. 1, Fig. 2).— A 

 form occurs rarely, which we consider a variety of Greville's 

 species. The valve is larger, and the surface is covered with close- 

 set, fine granular dots, in addition to the numerous large, well-de- 

 fined puncta ; there is no umbilical space. Diameter, -004". It is 

 very probable that this form is merely a variety of A. punctatus, 

 Grev. (nee. Bail.), " T. M. S.," Vol. xi, p. 49, PI. 3, Fig. 15, 16. 



A. punctatus, Bail. var. (A. Schm. "Atl.," PI. 67, Fig. 7). —Differs 

 from the typical form in the presence of a crescent-shaped clear 

 space enclosing the inner half of each process. This space is 

 more clearly defined in our form than in the figure in the Atlas. 

 Diameter -004". 



A. Barbadensis, Grev. ("I. M. S.," Vol. xiii, p. 5, PI. 1, Fig. 

 1). — This is more oval than Greville's form, but in other respects 

 closely resembles it; the radiating characteristic lines being es- 

 pecially distinct. 



A.fenestratas,n. sp., Gr. & St. — Valve small, oval; processes 

 two, small, situated at a little distance from the margin ; umbilicus 

 subdistinct. On the inside of each process, and partly encircling 

 it, is a crescent-shajDed clear space ; then, for a little distance 

 inwards, the valve is flat, but gradually becomes slightly depressed 

 as it approaches the centre ; the point where the depression com- 

 mences being marked on each side by a narrow clear space, 

 extending nearly across the valve. Surface covered with mark- 

 ings resembling those of A. pruinosus. Not scarce. Diameter 

 generally up to -003". One specimen observed with diameter of 

 •0045% (PI. Ill, Fig. 12.) 



A. ccelatus, Bail. (Grev. " T. M. S.," Vol. xi, p. 44, PI. 2, Fig. 

 4-7). — A variety of this is rare. 



A. Oama?uensis,n. sp., Gr. & St. — Valve nearly circular, large ; 

 processes two, very prominent ; umbilicus similar to that in A. 



