676 DR. GWYN JEFFREYS ON THE MOLLUSCA OF THE [Nov. 14, 
‘Porcupine’ Exp. 1870: Atl. St. 16, 17, 17a. Several speci- 
mens. 
Distribution. ‘Valorous’ Exp., Bay of Biscay (‘ Travailleur’ 
Exp. 1881); 1003-1450 fms. Off Culebra I., Danish W. Indies 
(‘ Challenger’ Exp.) ; 390 fms. 
This is easily distinguishable from any species of Fisswrisepta in 
having a conspicuous and persistent spire, as well as in the shape of | 
the septum. 
The only difference between Puncturella and Rimula seems to 
consist in the comparative length of the slit. This is proportionally 
much longer in the young than in the adult of the typical species, 
P. noachina. 
2. PUNCTURELLA NOACHINA, Linné. 
Patella noachina, L. Mant. Plant. p. 551. 
Puncturella noachina, B. C. iii. p. 257, pl. vi. f. 3; v. p. 200, 
ie ea gy 9s 
‘Lightning’ Exp.: St. 2, 4, 5, off the Faroe I. 
‘Porcupine’ Exp. 1869: St. 6,9, 13, 14 (and var. princeps ; and 
var. levior, laterally compressed, keeled in the line of the slit or 
fissure, and nearly smooth), North Channel, 70, off Lerwick. 1870: 
Atl. 2, 3a, 17, 17a, 24, 27, 28. 
Distribution. From Wellington Channel and Greenland to the 
southern coast of New England, Iceland, Spitzbergen, and Jan 
Mayen I. to Scarborough, Novaia Zemblia, Okhotsk Sea, N. Japan, 
and Corea, Strait of Magellan (Acton and ‘Challenger’ Exp.), 
between C. of Good Hope and Kerguelen I. (‘ Challenger’ Exp.) ; 
4—430 fms. 
Fossil. Miocene? : Sicily. Pliocene: Coralline Crag and 8. Italy. 
Post-tertiary : Scandinavia, Scotland, and Yorkshire, Sicily, and 
Labrador, mostly in ‘‘ glacial” deposits ; 0-470 ft. 
The odontophore has been well figured by Friele, and shows that 
it is of a Rhipidoglossan type. 
The genus Cemoria of Leach MS., as defined by Risso, is certainly 
not the genus Puncturella; his type is doubtfully referred to the 
Patella equestris of Linné. 
3. PuncrurELLA CLATHRATA’, Jeffreys. (Plate L. fig. 11.) 
Suexu forming an oblong cone, rather solid for its size, opaque 
and lustreless: sculpture, numerous fine longitudinal striz and 
stronger concentric ridges, the intercrossing of which produces a 
cancellated appearance ; the strize do not reach much beyond half- 
way from the margin, where the ridges become slighter and crowded 
up to the apex: colour pale brownish white : beak smooth, incurved, 
twisted a little to the left, and ending in a spire of a single whorl : 
JSoramen forming a long triangular slit: mouth oblong : margin finely 
scalloped: zmside smooth and glossy: septum large, triangular as in 
P. profundt, L. 0°15, B. 0°1. 
‘Porcupine’ Exp. 1870: Atl. St. 17a. A single and somewhat 
imperfect specimen, but peculiar and characteristic. 
1 Latticed, 
