124 NEW SPECIES OF TERTIARY MOLLUSCA FROM VICTORIA 
rather weak; the whorls are crossed obliquely by numerous close-set radial 
grooves, the result of the intersection of spiral lines and radial grooves being 
a series of elongate, flattish, bead-like granules. On the last whorl the spiral 
lines become very faint whereas the radial grooves persist to the periphery; 
a shallow spiral groove occurs on the last whorl just below the suture, and 
another close to the keel. The base is slightly convex, a conspicuous rounded 
cord encircles the base near the keel, with a faint thread in the intervening 
space. A deeply incised spiral groove limits the umbilical border. The latter 
is crossed by strong radial grooves giving rise to a series of rhomb-like 
structures which extend within the umbilicus. The outer edge of the incised 
spiral is also divided by radial grooves rather weaker, not corresponding 
to the inner ones, and extending well across the base. The umbilicus is wide 
and deep. 
Dimensions. — Holotype. Height, 8 mm. ; breadth, 19 mm. 
Observations. — This species resembles Solarium acufum T. Woods, in many 
of its features, but its spiral lineations are less granulose, also the character 
of the sculpture on the base is different. Instead of seven rows of spiral 
granulations as in S. acutum, our species has only one, that immediately 
surrounding the umbilicus, the remainder of the base being comparatively 
smooth. Its nearest ally is the New Zealand fossil Architectonica (Discotec- 
tonica) seniscula Marwick. In addition to that collected by the author, 
examples of the same species are contained inj:he Dennant Collection in the 
National Museum bearing Tate’s MS. name, Architectonica squamogranosa, 
but undescribed. The author has adopted Tate’s specific name. 
Locality. — Muddy Creek, lower beds. 
Geological Horizon. — Balcombian. 
Holotype. — No. 14102. 
Plate XIV. 
Photographs of Holotypes. 
Fig. 1. Architectonica (Discotectonica) squamogranosa, sp. nov., X 2 diam. 
Fig. 2. Mitrithara megale, sp. nov., X 3 diam. 
Fig. 3. Etrema turrita, sp. nov., X 6 diam. 
Fig. 4. Filodrillia turrita, sp. nov., X 3 diam. 
Fig. 5. Austrotriton balcombensis, sp. nov., X 3 diam. 
Fig. 6. Trophon (Enatimene) makros, sp. nov., X 3 diam. 
Fig. 7. Trophon (Enatimene) crassiliratus, sp. nov., X 4 diam. 
Fig. 8. Tugalia elata, sp. nov., X 2 diam. 
Brown. Prior, Anderson Pty. Ltd.. 430 Little Bourke St., Melbourne 
