172 MR. C. THOMPSON ON THE [June I913, 



We have not yet been able to confirm Blake's statement 1 that 

 C. johnstoni is found 'in nodules on the coast,' as well as 

 ' in situ at Bedcar,' but it is well to bear in mind that one positive 

 fact is worth more than any amount of negative evidence. 



"When reviewing the very slender whorled series belonging to 

 this genus, one finds that until this year (1912) these very slender 

 forms have disclosed themselves by only the poorest of fragments, 

 although search has been made for them for many years. Quite 

 recently, however, I found a boulder containing beautifully preserved 

 specimens, the best that I have ever seen. Mr. Buckman identifies 

 them as follows: — Caloceras Jaquem (Q,uenst.), C. cf. laqiiem 

 (Quenst.), and G. allasii (Brown). 



Neither Simpson nor Tate & Blake, although truly indefatig- 

 able collectors, found these beautiful narrow-whorled forms in the 

 north of the county. Again, as in the case of Psiloceras, work 

 has still to be done on the English specimens of this genus. 



It is rather a remarkable fact that I have not found one speci- 

 men of any of the preceding forms in the Boulder-Clay cliffs 

 themselves. All these older forms come from the beach-stones, as if 

 washed from a clay which is suffering submarine erosion. 



Angulata Beds. 



Dealing now with fossils from the zone of Sclilotheimia angulata, 

 one finds evidence of different conditions. Many specimens occur 

 in the cliffs themselves, especially at Filey, but representatives of 

 the species are scattered all along the Holderness coast as well. 

 As a rule, instead of occurring in blocks, each specimen, complete 

 or fragmentary, is found alone, and is generally in a gritty blue 

 matrix of shale. This shale evidently weathered easily, for the 

 fossils are comparatively clean. Most of these specimens are 

 crushed. So far, we have found only one boulder of hard pale 

 limestone containing this genus (Sclilotheimia) ; and, as the small 

 fossils which the boulder contained were mere casts in clear glassy 

 calcite, not much was secured from it. 



One of the specimens, which apparently came from a clay, was 

 identified by Mr. Buckman as Sclilotheimia exechoptycha (Wanner). 

 He considers two other specimens of the genus submitted to him 

 to be new forms. The collections made by others along the coast 

 contain several specimens comparable with Schl. trapezoidalis 

 (Sow.), while we possess one which may be placed with Schl. 

 ventricosa (Sow.). 



Bucklancli Beds. 

 The derived fossils from the Buclclandi Zone deserve special note, 

 for they are probably the most numerous of any, in consequence 

 of so many boulders of hard dark bluish limestone presenting 

 themselves to the hammer of the collector. 



1 E. Tate & J. F. Blake, ' The Yorkshire Lias ' 1876, p. 271. 



