Sl’lllULA. 
MOLLUSCA. CEPHALOPODA. 
S2T 
CEPHALOPODA. 
NAUTILIDiE. 
Gen. I. SPIRULA. — Whorls regularly involute, separate ; 
mouth orbicular ; partitions concave, perforated by a proxi- 
mal continuous pipe. 
1. S. australis. — Shell with fine smooth whorls; partitions 
slightly depressed externally. 
Nautilus exiguus, albus, pellucidus, teres, Lister., Conch, t. 550. f. 2.— 
Naut. Spirula, Linn. Sjst. i. 11C3. — Turton., Conch. Diet. 117— West 
coast of Ireland. 
Shell about an inch in breadth. The first chambers, at the apex, are a lit- 
tle inflated ; but, as they gradually increase in size, in the outer whorls, their 
surface becomes more even, and the line of separation less distinct ; partitions 
perlacious. The last chambers are nearly cylindrical, and produced in a 
straight line. According to Lamark, (Histoire Naturelle des Animaux sans 
Vertebres, vii. 600.), the shell is imbedded in the posterior extremity of the 
sac, a portion only of the last whorl being visible. The head is surrounded 
with eight arms and two feet. Two specimens of the shell of this animal 
were found on the strand between Kenmare Harbour and Ballyskellegs Bay, 
in the county of Kerry, by Mr O’Kelly of Dublin, in the summer of 1817. 
It is probable that the remains of many other animals, the ordinary inhabi- 
tants of the West Indian seas, will occasionally occur on the Irish coast, as 
in the present instance ; but we have to determine their capability of living in 
our seas before their right to a place in our Fauna can be established. The 
claims of the present species are doubtful. 
Gen. II. SPIROLINA. — Whorls contiguous. 
% S. suharcuatula. — Outer margin carinated ; inner margin 
rounded; partitions of the chambers raised on the sides. 
Naut. subarcuatus, geniculis exertis. Walker., Test. Min. t. iii. f. 73* 
Mont. Test. Brit. Sup. 80. t. xix. f. 1 — Sheppy Island, rare ; Mr 
Walker. 
Size about one-eighth of an inch. Chambers widest externally, making 
the margin of the mouth oblique ; about twelve in number, the last four 
forming the produced portion. Syphon near the inner or proximal margin. 
When the produced portion is broken off, the remaining convoluted part is 
considered by Montagu as having been figured by Walker, at t. iii. f. 66. 
3. S. semilitua. — Outer margin rounded; the partitions of 
the chambers raised on all sides. 
Nautilus sem. Mont. Test. Brit. 196. Sup. 80. t. xix, f. 3. — Sandwich and 
Sheppy, Mr Boys — Rare. 
