216 RECORDS OF THE AUSTRALIAN MUSEUM. 
Plewrotoma peaseana Dunker, Malak. Blatt., xviii, 1871, p. 158. Id. 
Weinkauff, Conch. Cab., 1876, p. 69, pl. xv., figs. 1, 3. 
Pleurotoma jickelii Weinkauff, Conch. Cab., 1875, p. 20, pl. iv., figs. 2, 3. 
Pleurotoma tigrina Potiez and Michand, Galerie Moll. Mus. Domai, i., 1838, 
p. 448. Id. Brazier, Proc. Linn. Soc. N.S.Wales, ii., 1877 (1878), 
p. 368. 
Turris acuta Hedley, Proc. Linn. Soc. N.S.Wales, xxxii., 1907, p. 484. 
? Lophiotoma microsticta Casey, Trans. Acad. Sci. St. Louis, xiv., 1904, 
p. 130. 
Thus I have identified a shell which is common along the east coast 
of tropical Queensland, both in the muddy estuary and off coral reefs. In 
life it is clothed in a thick fibrous epidermis which, as in my figure, hides 
the colour pattern of the shell beneath. The size and density of the 
brown dots vary. Some difference in proportion also occurs, thus a stout 
specimen from Hope Island is 42 mm. long and 13 mm. broad, but a 
slender specimen from Cape Flattery is 40 mm. long and 10 mm. broad. 
A shell 30 mm. in length which I dredged alive at the entrance of the 
Starcke River is here illustrated (Pl. xlii., fig. 2). Another (PI. xlii., fig. 3) 
dredged in 3 fathoms off Hagle Island, North Queensland, exhibited the 
following features:—Apex mucronate, of two smooth and glossy whorls, 
followed by whorls bearing a strong subsutural ridge and a double peri- 
pheral keel. The upper four whorls are distinguished by a uniform 
cinnamon brown from the white remainder of the shell. 
The confusion of nomenclature applied to this species was in the first 
instance probably due to the blindness of Lamarck, whereby the names 
of different species were displaced. Thus the shell named Plewrotoma 
marmorata in 1822 was different to what he had figured under that name 
in 1816. Blainville* was the first to observe the transposition. Brazier, 
who was the first to note this as an Australian species, used for it the 
name of Plewrotoma tigrina ; but, according to Kiener’s figure of authentic 
material, P. tigrina differs by its broader build and particularly by the 
occurence of spiral threads within the fasciole. Subsequently, following a 
reference by Deshayes,° I called the species Turris acutu. On reconsidera- 
tion, the shell figured as acutw by Perry® seems to differ in shape from 
T. tigrina, and to approach that of Gemmula granosa Helbling. Deshayes 
further suggested that Pleurotoma pwnctata of Schubert and Wagner might 
be united to 7. tigrina, but I should prefer to regard that as identical 
with Plewrotoma wnedo Kiener. 
Hab. Queensland :—380 fathoms, Darnley Island ; 14 fathoms, Princess 
Charlotte Bay (Brazier); Murray Island; Starcke River; Lizard Island; 
Hagle Island; Cape Flattery ; Hope Island ; Palm Island ; Mast Head 
Reef (self). 
4 Blainville—Dict. Sci. Nat. Meth., xli., 1826, p. 385. 
® Deshayes—Anim. sans. vert. (2), ix., 1843, p. 352. 
6 Perry—Conchology, 1811, Pl. liy., fig. 4. 
