84 
MEMOIRS OF THE QUEENSLAND MUSEUM. 
collected at North-west, Island. Schilder correctly points out that this is distinct 
from interrupta Gray, but falls into a curious error in citing as a synonym coxeni Cox, 
a species quite unlike. While Schilder ranges rhinoceros with asellus it is somewhat 
aberrant and had better be separated as Blasicrura, and as to coxeni its relationships 
seem to be more with errones, but again it would be best to provide it with a new 
subgeneric name, Eclogavena, also. By this means, errors such as the above will be 
obviated. 
Another case of an extralimital species may be noted. Schilder includes 
the beautiful guttata Gray under the subgenus Erosaria, but it certainly deserves 
separation and I therefore introduce the new generic name Perisserosa for it alone. 
Schilder also cites t lie specific name from Gmelin, but, as Gmelin’s first two references 
certainly do not refer to this species, it will be more correct to propose a new name, 
Perisserosa brocktoni, for the specimen figured by Sowerby (Tlies. Conch., vol. iv, pi. 
xvii, ff. 104-105, 1880) under the name Cyprcea guttata Gray. This specimen should 
be in the collection of my friend Mr. J. R. le Brockton Tomlin, for whom it is named. 
Nivigena melwardi gen. & sp. nov. 
(Plate IX, figs. 12, 13.) 
Shell small, pyriform, spire depressed, shining bluish white, mouth fairly 
narrow. The extremities are a little produced, anteriorly a little pinched, the spire 
appearing semi-umbilicate, the edges thickened. The back is fairly convex with 
obsolete spiral ridges present ; the outer edge is thickened and recurved with faint 
suggestions of crinkling as in Erosaria ; the contraction of the anterior end recalls 
that of Stolida, the semiumbilicate spire similar to that of Stolida ; the mouth is 
narrow, the teeth fairly large, on the outer lip sixteen deep clear teeth being counted 
while on the inner lip fifteen are present which are continued inwards on to the 
columella and visible from the outside. 
Length 24 mm. ; breadth 16 mm. ; height 12 mm. 
Habitat : Queensland. Type from North-west Island, Capricorn Group. 
This beautiful species is not an albinism of any known Queensland species, 
differing in shape from C. stolida. Linne which otherwise it resembles most, the mouth 
easily separating it from that species. 
Family OVULID/E. 
For this family Schilder uses the name Amphiperatidse, probably correctly, 
based on the generic name Amphiperas of Gronow as used by Meuschen in a binomial 
sense. The name Amphiperas will then replace Ovula for the two species 
listed by Hedley in the Queensland list under the names ovum Linne and tortilis 
Martyn. The rejection of Martyn’s names will necessitate reversion to Lamarck’s 
costellata (Ann. Mus. Paris, vol xvi, 1810, p. 110) for the latter species. The other 
species included by Hedley were obviously not congeneric and I had separated 
them many years ago in manuscript, so I was delighted to find that Schilder 
had ruthlessly reorganised these species. I do not agree with his rejection of Bolten’s 
Volva in favour of the later Radius of Montfort, and therefore use Volva volva for the 
