516 Transactions. 
shorter canals than the more ancient E. crenulata (Lamk.) and its allies. 
P. novae-zelandiae Reeve has a narrower and deeper sinus than both these 
groups; it is not on the peripheral nodular row (which is never strong as 
in Epideira, and often quite obsolete), but just above it, in a rather smooth 
space, traversed always by at least one distinet spiral thread at the middle 
of the sinus. The spire is higher, the shell more slender, and the bead- 
rows much less conspicuous. e apex is absolutely different, being 
conic, polygyrate, and quite symmetrical, much taller than wide; the 
tip, though minute, not pointed but flatly depressed and slightly immersed, 
not at all bulbous. And, lastly, a radical difference is the possession by 
Phenatoma of a strong basal notch in the canal, giving rise to a prominent 
fasciole and carina, just as in Belophos and Austrotoma. On account, 
however, of the wide differences in embryo and anal notch, Phenatoma does 
not seem otherwise closely allied to the Pseudotominae. To Phenatoma 
may also be referred Drillia cheesemani Hutt. (Bathytoma), and Pleurotoma 
plicatella Hutt. (Drillia). Closely allied also is the group of shells centring 
round Pleurotoma albula Hutt.; these forms are very common in the New 
Zealand Tertiaries, and form an easily recognized division of Phenatoma, 
as follows :— 
CRYPTOMELLA n. subgen. Туре, Leucosyrinz transenna Sut. 
h 
following species: Drillia multiplex Webster, Defrancia excavata Hutt 
(Genotia), Pleurotoma albula Hutt. (Bathytoma), P. subalbula Murd., an 
Bathytoma antecostata Sut. Hedley has referred P. albula to his Filodritha. 
ustralian species. It is worthy of note that Inquisitor metcalfei Angas 
seems to be an Austrotoma, closely related to the New Zealand Drillia 
optabilisM.& 8. 
