W. H. Hudlcston—On the YorkaJiire Oolites. 61 



It is almost dangerous to suggest what may be the representative 

 or nearest relative of C. Beanii, on the Continent. C. fupceforme, 

 Koch and Dunker (Beitr. p. 33, pi. 2, fig. 10), has some resemblance 

 to the more pupoid forms of C. Beanii, but in general appearance 

 rather than in details. Koch and Dunker's species is stated by 

 Brauns (Mittl. Jura, p. 176) to occur in the middle division of the 

 Parkinsoni-zoue of North-west Germany. 



26. — Cerithium Leckenbyi, sp.n. Plate III. Fig. 12. 



Description. — Specimen from the Dogger (zone 1), Peak (Blue 

 Wyke). Leckenby Collection. 



Length (restored) ?17 millimetres. 



Width 4 ,, 



Height of whorl to width 2 : 3|. 



Spiral angle 14"". 



Spire elongate, conical, sub-turrited. There are indications of 

 about 13 whorls, which, as far as can be judged from the somewhat 

 imperfect condition of the apical portion of the spire, increase under 

 a perfectly regular angle : they are flat, short in comparison with 

 their width, and follow close on the suture, which is consequently 

 rather narrow. The ornaments consist of 5 finely granulated or 

 tuberculated spirals, of which the first is the strongest, and the fifth 

 the faintest. The longitudinals are irregular, as in C. Beanii, 

 frequently not reaching to the anterior portion of the whoid. Spirals 

 in the base of the body-whorl scarcely granulated. Aperture in 

 matrix. 



Relations and Distribution. — Closely related as regards ornament to 

 C. Beanii, though not showing the extreme faintness of the third 

 and fifth spirals. The spire is less turrited, more elongate, and, as 

 far as one can judge, not in the least pupoid. Hence, in spite of its 

 being an unique specimen, I have felt constrained to recognize this 

 form as a " species," though it might be called C. Beanii, var. 

 elongatum. Mr. Leckenby himself seems to have taken this view. 



27. — Cerithiubi tukris, sp.n. Plate III. Fig. 13. 



Description. — Specimen most probably fro ui one of the nodule beds 

 of the Dogger. Jermyn Street Museum. 



Length (restored) 13 millimetres. 



■\yj(jl;]j^ 43 



Height of whoii to width ' '. '. '. ". .............. 2* 4i'.' 



Spiral angle 20°. 



Spire short, strongly turrited, with probably a blunt apex. 

 Whorls about 12 or 13 in number, flat, and short, suture close. The 

 ornaments are very conspicuous for so small a shell. Seven spirals are 

 counted on the penultimate, consisting of wavy lines with granula- 

 tions, drawn out spirally, at considerable intervals, producing a sort 

 of basket-like pattern. The longitudinals are very strong, and close 

 together, especially in the upper part of each whorl, but are on the 

 whole irregular. Aperture sub-quadrate to oval, with a well- 

 developed anterior canal. 



Belations and Distribution.— Obviously related to C. Beanii, this is 



