UNRECORDED GENERA OF THE OLDER TERTIARY FAUNA. 185 
Genus Humargarita, Fischer, 1885. 
To this genus must be referred the species included under 
Minolia, one of which EZ. lucens, mihi, from the Eocene of Spring 
Creek, belongs to the genus in its restricted definition, the others 
fall into the subgenus Solariella, 8. Wood, 1842, they are Margarita 
Keckwicki, Ten.-Woods, Hocene, Table Cape, Minolia strigata, 
Ten.-Woods, Eocene, Muddy Creek, &c., and 8S. rhysa, mihi, 
Eocene, Adelaide. 
Genus Basilissa, Watson, 1878. 
Since the establishment of this genus, which originally included 
seven recent species, five have been signalled in the Parisian 
Eocene. It is especially distinguished by the sinus in the outer 
lip near its insertion. When describing Sequenzia radialis, Trans. 
Roy. Soc. 8. Austr., 1890, p. 192, I referred to an undiagnosed 
species of Lasilissa, obtained from the Hocene clayey sands in the 
Adelaide bore which simulated it ; I add here a brief description of 
BasinissA CossMANNI, spec. nov., Pl. x1., fig. 8. 
Shell broadly conical ; whorls flat except a slight angulation at 
the posterior suture, ornamented with slender lire (about seven on 
penultimate whorl) which increase in strength from behind forward 
latticed by slender oblique transverse threads, minutely granulated 
at the intersections. Base flat, ornamented with about nine 
depressed concentric ribs, the intervening sulci of about equal 
width to the ribs are traversed by radial threads; umbilicus 
moderate, its margin crenulated. Length and breadth 4 mm (vix.) 
The species-name of this pretty shell of a very interesting genus 
is given in acknowledgment of valuable help in the elaboration of 
our Tertiary Mollusca rendered by the author of a “ Catalogue 
Illustré des Coquilles Fossiles de ’Eocene de Paris.” 
Family FissurELLID&. 
Genus Scutwm. 
ScUTUM ANATINUM, Donovan. 
Examples of this recent shell have been collected from the Eocene 
beds of the Moorabool Valley by Mr. Sweet ; they are very little 
