QUEENSLAND MOLLUSCAN NOTES, No. 1. 
1917) and its range is given as Northern Queensland and New Caledonia as well 
as New South Wales. Upon comparison the New Caledonian shells are found 
to be larger and proportionately narrower, and with more numerous ribs with 
much more pronounced prickles, ll may be called Ciunalcpeta vagans n. sp. 
The shells from tropical Queensland have closer ribs than the Sydney shells, 
while their shape is different, the apex more posterior. This form will be later 
figured, but may here be named ( 1 1 nnalepeta csG&naa n* sp., the type being from 
the Ann am River, North Queensland. 
The sculpture, form, and texture of the senta— ling uaviv err ce group is 
characteristic, and the new generic name Zacalantica is here introduced, the 
species Imgnmnverne being named as type. There appears to be more than 
one species in Queensland. The most curious find at Michaelmas Cay was a shell 
with a much stronger texture and an apex nearly median and not recurved. It 
was obviously a distinct type and is here named Amapileus, the new species 
here described being named as type. 
Amapileus immeritus sp. nov. 
(Plate XXXI, tig. 8.) 
Shell small, conical, apex submedian, thin, translucent, white. The 
nuclear whorls are about one and a- half* coiled helicoid and flattened, the 
succeeding sculpture radials begin, faintly at first, strengthening rapidly, about 
thirty increasing by intercalation to about sixty at the margin; the ribs are 
sharp, elevated, narrow with wide interspaces which are very finely concentrically 
striate, only seen with a good lens; margin smooth, thick, not crenulated by 
the ribs. Length 10 mm.; breadth 8*5 mm.; height 5 mm. 
Is apparently related to P. lavicosialis Thiele (op. cit., p. 31, pi. 5, figs. 
7, 8), described from unknown locality, but is closer ribbed and ribs narrower. 
Collisellina bellatula sp. nov. 
(Plate XXXI, fig. 13.) 
A small Patelboida was found among the shell-drift at Michaelmas Cay, 
North Queensland, and later found alive on dead clamshells. In the Australian 
Museum I find the same species (unnamed) from Kawieng, New Ireland, but the 
species seems hitherto to have been overlooked. 
Shell elliptical, depressed, apex anterior, regularly ribbed, ribs twelve 
in number, rarely additional ones are developed, edge of shell uneven, strongly 
crenulate. Colour white, radially lined with brown, obscured in life by coralline 
growth, inside white, spatula marked with pale brown. Ribs smooth save for 
growth-lines. Length 14 mm. ; breadth 9-5 mm. ; height 4 mm. (type) : largest 
specimen 19 x 14 x 6 mm. 
Habitat: North Queensland (on the Great Barrier Reef). 
1 do not know any species that needs comparison. On the reef the form 
of Collisellina I discussed in the Proe. Zool. Soc. (Loud.) 1914, p. 670, was 
rarely met with but many specimens have been seen, and it must now be named. 
On account of further knowledge it is here specifically named as Collisellina 
paropsis sp. nov., the type being selected from Michaelmas Cay, a dead shell 
measuring 30 mm. in length, 23 mm. in breadth, and 9 mm. high. Much larger 
