MOLLUSCA. 
: Genus Fusus.—(Page 6.) 
36. Fusus Basytonicus, pl. LVII, f. 19. 
Shell fusiform, subeylindrical; body large, obliquely flattened 
above; spire not a third the length of the shell, consisting of 
five cylindrical, rapidly decreasing volutions, which are obliquely 
flattened above, and terminating in an acute apex; the whole 
of which, together with the body, with a slight spiral carina on 
their superior edge; aperture oblong-oyate, narrow above, 
spreading in the centre, and contracted below into a rather 
narrow canal of medium length; inner lip small, broadly re- 
flected on the columella; whole surface covered by numerous 
spiral, somewhat irregular, slightly waved striae, with inequidis- 
tant, nearly obsolete, longitudinal wrinkles; colour cream-white ; 
the aperture pale golden-yellow. 
This shell has much the aspect of Fusus antiquus, and pro- 
bably only a dusus of that species. I found it on the strand, 
opposite Hull, and it is now in the splendid cabinet of Thomas 
Norris, Esq., Red Vales, near Bury, Lancashire. 
37. Fusus Boorun, pl. LVII, f. 12. 
Fusus Boothii, Brown, Wernerian Mem., VIII, p. 50, pl. 1, 
fle 
Shell strong, with eight deeply defined, well rounded volu- 
tions, tapering to an acute apex; provided with numerous, 
slightly oblique, strong, longitudinal ribs, which, together with 
the interstices, are crossed by close-set, strong, spiral strie, 
between most of which are finer striae, giving the shell a lamel- 
lated aspect; suture of the spire broad, concave, and not cros- 
sed by the ribs, but spirally striate; aperture oblong-ovate, a 
little contracted above, and furnished with two longitudinal 
purple belts, leaving the margin next the outer lip white; pillar 
lip white, smooth, with a slight longitudinal groove near its 
external margin, and furnished with a brownish-purple spot 
above; outer lip thick, flattened on the edge with a zigzag 
groove in its centre, and a slightly rounded sinus above, at its 
junction with the body; outer margin crenated; canal short, 
and wide; external surface of a deep chocolate-brown. Length 
five and a half eighths of an inch; breadth somewhat more than 
a quarter of an inch. 
This beautiful species was dredged in Rothesay Bay, by 
Mr. Smith, and, with it, the fragment of a shell of the same 
species, measuring upwards of three-eighths of an inch in 
diameter, so that this species must attain the size of nearly an 
When we first removed it from the dredge, we took it 
for the F. purpureus, but on a more close examination, we 
inch. 
found it to differ from that shell in the following particulars. 
It has fewer volutions, the spire is shorter, and not quite so 
taper, in the thickness and other characters of the outer lip 
it differs materially, and it is destitute of the stria inside the 
aperture. 
30. Fusus carinatus, pl. LVI], f. 20. 
Murex carinatus, Penuant, Brit. Zool., [V, p. 123; Dono- 
van, pl. 109; Turton, Conch. Dict., p. 88, pl. 27, f. 95. 
I consider this a mere dusus of Fusus antiquus, which is by 
no means uncommon in Ireland, sometimes with two, and at 
others with three carine. This is figured from a specimen in 
the possession of M. J. O’Kelly, Esq.; and Robert Ball, Esq., 
of Dublin, obliged me with a large specimen which is only 
bicarinated; and probably figures 10 and 13, pl. VI, is another 
form of the same. 
127 
Genus Pyramis.—(Page 14.) 
22. Pyramis Trirasciatus, pl. VIII, f. 30. 
Pyranis trifasciatus, First Ed., pl. 51, f. 30; Turbo trifas- 
ciatus, Adams, Linn. Tr., V, p. 2 pl. 1, f. 13, 14; Turbo unifas- 
ciatus, Montagu, p. 327. 
Shell smooth, conic, white; spire with four slightly inflated 
volutions, separated by a narrow and shallow suture; with 
three purplish-brown bands on the body yolution, which 
become confluent in the two lower volutions of the spire, 
situate close to the suture; aperture suboval; outer lip thin, 
and very slightly reflexed ; columellar lip somewhat thickened, 
and reflected. 
Found, but rarely, on the shore at Southampton; and Bur- 
ran Island, Devonshire. 
Genus PLEuRoToma.—(Page 8.) 
4. PLEvRoToMA TREVELLIANUM, pl. LVI, f. 1. 
Pleurotoma Trevellianum, Turton, Mag. Nat. Hist., VII, p. 
3515; Macgillivray, Moll., p. 172. 
Shell fusiform, turreted; body about double the length of 
the spire; which consists of six turreted, flat-sided, nearly 
cylindrical volutions, flattened above, abruptly diminishing, and 
terminating in an acute apex; sutural line very narrow; aper- 
ture pure white, oblong-ovate, terminating in a canal of medium 
length; outer lip with a pretty deep, rounded sinus near its 
junction with the body; inner lip smooth, glossy, and rather 
broadly reflected on the columella; whole surface of a pale 
yellowish-white, and covered with numerous, close-set, longi- 
tudinal, smooth ribs; the interstices covered with many strong, 
transverse strie. Length nearly three-quarters of an inch; 
breadth about a third of its length. 
This shell has much the aspect of Fusis turricula, but will 
at once be distinguished from it by the pretty large sinus on 
the superior portion of the outer lip; its diameter is also 
greater in proportion to its length, and the ribs and strie are 
considerably more numerous. 
First discovered by Mr. Bean, at Scarborough, where it is 
abundant; Macgillivray gives it as a deep water species, off 
Aberdeen; and I lately procured it among specimens obtained 
by the dredge, at Prestonpans, East Lothian. 
5. PLEUROTOMA DECUSSATUM. 
Pleurotoma decussatum, Macgillivray, Moll. Ab., p. 172. 
Shell elongated, fusiform, rather thick; volutions rounded ; 
spire tapering to a fine point; suture distinct ; whole covered 
with longitudinal ribs, narrower than their interstices, which 
are provided with numerous spiral, thin lamin, also crossing 
the ribs, on which they form small oblong tubercles; aperture 
oblong-ovate, with an elongated, oblique canal; colour ye!low- 
ish-white. Length a quarter of an inch. 
Found by Professor Macgillivray, in deep water, off Aber- 
deen, and at Boddam, near Peterhead. 
The Professor says, “It appears to agree with Captain 
Brown’s Fusus decussatus.” If so, it must be a Fusus, because 
my shell is -totally devoid of the distinguishing character of 
Pleurotoma, namely, the sinus in the superior portion of the 
outer lip, as will be seen by referring to figures 53 and 55, 
plate V. 
