84 FAUNA OF THE CORNBRASH. 



paneled the meaning of Amberleya to include two other genera, one of them 

 acknowledged to differ only in details from his former Littorina. Eucyclus is too 

 well characterised a genus to admit Amberleya nodosa within its limits. 



Eucyclus armiger (Lycett). Plate VIII, figs. 9, 10. 



1863. Amberleya armigcra, Lycett, Suppl. Great Ool. Mollusca (Pal. Soc), p. 20, pi. xxxi, fig. 6. 

 1884. — — Hudleston, G-eol. Mag. [3], vol. i, p. 245, pi. viii, fig. 5. 



Type. — " Shell conical ; spire elevated, pointed ; volutions 5, convex, somewhat 

 angulated with 4 encircling costge or carinas which are densely and delicately tuber- 

 culated and decussated by fine striations, the two lower costas being much larger 

 than the upper, so that the lowest costa overhangs the upper part of the next 

 volution ; the base has 5 encircling serrated costae ; there is no umbilicus. Height 

 10 lines, length of the last volution 8 lines." From Scarborough. In the Leckenby 

 Collection. 



Description. — The fourth row of knobs from the top occupies the crest of the 

 angle and divides the surface into two halves, the lower half being occupied by 

 smaller and more regular knobs, the third row from the top the largest and fewest. 

 The succeeding whorl does not reach quite to the crest, so making a deep suture 

 which is a well-marked feature of the shell. The upper whorls contain 3 rows 

 only. Six spirals can be counted on the base. One specimen shows the aperture 

 in a perfect condition ; the outer lip is angular in the centre, after the pattern 

 of the whorl. It meets the straight columella at an angle, almost like a channel. 

 The deposit from the inner lip obliterates the spirals on their reaching the 

 columella. 



The shells of this species are usually preserved and casts are rare. They show 

 the shape very well, especially the deep sutures, also remains of the keel at the 

 angle and of the rows of knobs on the base. 



Distribution. — All but one of the specimens seen are from Scarborough (22) ; 

 the exception, which, being in a soft matrix, is more easily worked out, is from 

 Sudbrook. 



Relations. — This species is very closely allied to " Turbo" meriani, Goldf. (after 

 D'Orbigny), but the angle and the strong features of the third and fourth rows of 

 knobs are more marked. These are little more than local varieties, the one of the 

 other. IAttorvna phillvpsi, which has been supposed to occur also in the Cornbrash, 

 is said to have a shorter spire and smaller number of whorls, and it is drawn as 

 having no such deep sutures. I have not seen such in the Cornbrash. There is, 

 however, some variation in size of shell and angle, but not beyond the ordinary 

 range of a species. 



