536 W. H. Hudleston—The Yorkshire Oolite. 
siderable prominence; sutures well marked and wide. The whorls 
have four cost, of which the two lower form a strong double-ridged 
varix (affinity with Eucyclus). About five costa, with granulations 
diminishing in size anteriorly, occupy the base of the last whorl, 
making nine in all. The further details of the ornamentation cor- 
respond with those of Z. muricatulus. 
Fig. 9b. represents the upper portion of the last whorl of a speci- 
men from the Trigonia-beds of Weymouth, which approaches still 
nearer to Z. pulcherrima. 
Relations and Distribution.—The affinities of this shell may be 
partly gathered from previous descriptions. Regarded in a general 
way it may be viewed as a Corallian or Kimmeridgian variety of an 
Upper Oxfordian form which is tolerably Proteean in its ornamenta- 
tion, and perhaps in the vigour of its growth. The “species” (re- 
garding L. muricata, Sow., for the moment as one) assumes an 
infinity of aspects under the influence of physical conditions, and of 
distance in time and space. The variety just described is perhaps 
the nearest to the original L. muricata of Steeple Ashton, to judge 
from Sowerby’s figure, but with a spiral angle of lower value, and 
perhaps a more elaborate ornamentation. In Yorkshire it is chiefly 
found in the Coral Rag of the Howardians. 
In North Germany the group is probably represented in part by 
Turbo punctato-sulcatus, Roemer (Ool. Geb. pl. xi. fig. 7, p. 158), 
which, according to Brauns (Ob. Jura, p. 222), occurs sparingly in 
the Coralline Oolite of Hoheneggelsen and Hildesheim. 
Subgenus AmpeRLeya, Lycett, 1850 = EHucyclus, Deslongchamps. 
The subgenus Amberleya was first instituted by Lycett (Morris 
and Lycett, Great Ool. Moll. p. 54), in 1850 for a section of Littorina, 
agreeing in general characters with the genus Pagodus of Gray. 
The generic definition was not very close. Only one species was 
described, and that not very characteristic. In 1860, Deslong- 
champs (op. cit. p. 138) wrote a valuable note showing the utility of 
withdrawing from the genera Turbo and Purpurina certain shells of 
the Jurassic formations, for which he proposed to institute the genus 
Bucyclus. This he admits to be the same as the Amberleya of Lycett, 
but he gives a much fuller diagnosis, and describes some new species. 
In 1863, Lycett (Suppl. to Great Ool. Moll. p. 19) alludes to the 
importance of Deslongchamps’ work, and shows that Hucyclus is a 
synonym of Amberleya. 
34.—AMBERLEYA STRICKLANDI, sp.n. Plate XVII. Fig. 10. 
Description.—Specimen from the Coral Rag of Brompton (Strick- 
land Collection). 
neni eGHy 8s: elds apoledsk Mee Seas eek entree ea ee 23 millimétres 
Width across dine belt array sec eee 16 5 
Spiral anole taverage a.jyecn one ene 57°. 
Shell nearly half as long again as wide, ovate oblong, not umbili- 
cated. Spire composed of five or six whorls; the two anterior very 
large and angular, whilst the sutures are strongly pronounced. ‘The 
body-whorl is inflated, and exceeds in height the rest of the spire. 
