BOULDER-CLAY AT BRIDLINGTON QUAY. ook 
deep: mouth oval, somewhat expanded ; the inside or throat is ob- 
scurely notched : outer lip thin, outside of the labial rib: imner lip 
folded back and adhering to the pillar, continuous with the outer 
lip; behind the pillar is a deepish semicircular groove, which is in- 
dicated by the specific name. Length 0-2 in. Breadth 0:1 in. 
Several specimens. JI do not know any recent or living species 
like it in respect of the basal groove. 
I also consider it desirable to take this opportunity of having 
figured for the first time another peculiar species of Rissoa (R. Wy- 
ville-Thomsoni, Pl. XV. fig. 3), which was found with the species 
now described, and which will be more fully noticed in my forth- 
coming Part of the ‘ Lightning’ and ‘ Porcupine’ Mollusca in the 
‘ Proceedings of the Zoological Society.’ 
3. PLEUROTOMA MULTISTRIATA *, Jeffreys. Pl. XV. fig. 4. 
Shell oval, moderately strong, semitransparent, and glossy : sculp- 
ture, very numerous and close-set longitudinal and spiral stri, the 
intercrossing of which causes a fine decussation; the first whorl is 
quite smooth : colour pale yellowish-white, with two reddish-brown 
and rather broad bands, one immediately below the suture, and the 
other encircling the base of the last whorl : spire shortish, turreted ; 
apex bulbous: whorls 4-5, convex, abruptly enlarging; the last 
takes up two thirds of the spire: suture deep: mouth irregularly 
oblong: canal short and wide, inflected or turning back: outer lip 
angulated at the top, and sloping downwards with a gentle curve: 
labial notch shallow: iner lip forming a broad glaze on the pillar 
and showing the attrition and excavating power of the foot: pillar 
flexuous. Length 0°2in. Breadth 0:1 in. 
Many specimens. P. novaja-semljensis of Dr. Leche, from the Kara 
Sea (Lat. 75° 35’ N.), might, from the figure, be mistaken for this 
shell ; but that 1s probably a variety of P. ewarata of Moller, which 
Leche considered a variety of P. turricula. The coloured bands are 
also peculiar to the present species. 
4. Urricutus constricrus 7, Jeffreys. Pl. XV. fig. 5. 
Shell oval, deeply constricted in the upper part, and broader in 
the middle; it is thin, opaque and lustreless: sculpture, fine and 
flexuous longitudinal striz in the constricted groove, and some 
irregular striz in a spiral direction : colour dirty white: spire pro- 
duced, but short and turreted: whorls 4, rather convex, having a 
thickened ridge or ledge at the top of each; top whorl inflected : 
suture deep and narrowly excavated: mouth long, contracted on the 
upper part, expanding and oval below: outer ip flexuous, com- 
mencing at about one third of the last whorl : ener hp also flexuous, 
thick, and spread on the pillar, behind which is a narrow chink. 
Length 0-1 in. Breadth 0-075 in. 
Three specimens. Mr. Lamplugh informs me that other speci- 
mens were found, but had been lost. This species differs from U. 
* Covered with striz. + Contracted. 
Q. J G.S. No. 158. Y 
