320 G. W. LAMPLUGH ON SHELLY PATCHES IN THE 
GASTROPODA continued. | Pleurotoma elegans, Méill.... A. L. 
*Pleurotoma exarata, ek - A Te lees gear oan nee i 
* decussata, Cowth.,. . Am, aa, 2 TR a4 8 me i 
* simplex, ‘atdeniont . ACT, | tie obtusus, Mont., var. 
| 5. ee 
g eeBe PELs pee ee et Ye Jeifr. ve es = 
var.. Violacea, .....<-.s0s A. Am.L, | “Bulla crebristriata, Jeffr...... sp. 0. 
The total number of species in the above list is 88, of which 73 
are Arctic, 2 are American, 1 only is deep-water, 5 are new to 
science, and 3 require confirmation as to their being fossil or recent. 
With respect to Rissoa costata and R. semistriata, which belong to 
temperate and southern parts of the North Atlantic, I am not 
satisfied that they really belong to the glacial bed or deposit above 
described. Mr. Lamplugh also gives Thracia pubescens from similar 
beds at Dimlington ; if correctly identified, this species is nat known 
as living anywhere north of the south of England. 
New Species. 
1. Lirroriwa? etoposa *, Jeffreys. Pl. XV. fig. 1. 
Shell globosely conical, thick, opaque, and rather glossy : sculpture 
none: colour yellowish brown, whitish about the pillar: spire short, 
compressed at the apex or point: whorls 4, convex, the last dispro- 
portionately large: sutwre slight: mouth roundish, contracted above 
and curved below: outer lip hemispherical, with a sharp edge: 
inner lip filmy: pillar broad and thickened at the base; behind it 
is a small and narrow umbilical chink. 
Length 0'lin. Breadth 0:1 in. 
About half a dozen specimens occurred, but all more or aes im- 
perfect. In this condition it is impossible to determine whether the 
shell belongs to, Littorina or to Trochus. If to the former, a littoral 
habitat must be inferred; if to the latter, a shallow-water or deep- 
sea habitat might have been the case. The characters of the shell 
induce me to place it provisionally in Littorina. 
2. RIssoA SUBPERFORATA T, Jeftreys. Pl. XV. fig. 2 
Shell pyramidal, rather thick, semitransparent, inwtaekeee in its 
semifossil state: sculpture, numerous longitudinal fine and curved 
ribs: there are about 25 on the last whorl, which are not continued 
below the periphery ; the labial rib is very thick ; all these ribs are 
crossed by more numerous and close-set spiral strie, but not so as 
to produce a decussated or reticulated appearance, because the ribs 
are stronger and more prominent than the strie; the base is en- _ 
circled by half a dozen of these striz, the lowermost of all forming 
a strong ridge which encloses the basal groove afterwards mentioned ; 
the two or three apical whorls are quite smooth and polished : 
colour yellowish-brown : spire extended and pointed: whorls 6, 
convex, the last occupying at least two thirds of the spire when the 
shell is placed with the mouth upwards : suture distinct and rather 
* Globose. + Somewhat perforated. 
