150 MR. L. RICHAKDSON ON THE [vol. lxxiv, 



Terebratulce, and I am inclined to regard them as a thicker and 

 softer development of the bottom-stratum of the Scissum Beds as 

 developed at Whaddon Hill, 1 or — expressed in another way — as on 

 the horizon of the top-stratum (early seism') of the Brachiopod 

 Beds of that locality and of the Conegar-Hill Section, Broad- 

 windsor. 



The Scissum Beds are absent from the neighbourhood of Bradford 

 Abbas in the Sherborne district, and therefore— like the Aa I en sis- 

 and Opaliniforme-l$e&s — fail somewhere between Haselbury and 

 Yeovil Junction. 



(xxiv) AncoUoceras Beds. — These beds 2 are not always easy to- 

 separate, on the one hand from the Scissum Beds below, and on, 

 the other hand from the Murchisonce Beds above. They are very 

 fossiliferous, containing mairy species common to the Scissum - 

 Beds, and are characterized by ammonites of the genus Gey er in a 3 

 and Lytoceratids of the style of Pachylytoceras aalenianum 

 S. Buckman. 



At the Conegar-Hill Section, Broad windsor, the Ancolioceras- 

 Beds comprise two strata, each 1 foot thick. Similar strata extend 

 into the Crewkerne district, and are to be seen at the Misterton 

 Limeworks (3) and Slade's Quarry, North Perrott (28). It may 

 be that the upper portion of the lowest rock-mass visible (in 1916) 

 at Haselbury-Mill Quarry (30) is of this date, but I have not 

 obtained any evidence from ammonites here. 



(xxiii-xxii) Murchisonce Beds. — The true Murchisonce Beds in 

 the neighbourhood of Beaminster are very rich in specimens of 

 Zeilleria anglica (Oppel). Beds replete with specimens of the 

 same species have been observed by Hudleston at I)rimpton (1) — a 

 village 3 miles south-south-west of Crewkerne, and at Haselburv 

 Plucknett (29) — 2 miles east-north-east of Crewkerne. In the 

 intervening tract— in which are situated Misterton and NortL 

 and South Perrott — specimens of Zeilleria anglica (Oppel) are 

 rarely met with, and the beds are not always easy to separate- 

 from the AncoUoceras Beds below. 



(xxi-vii) Bradford 'ensis-JViortense Beds. — The only rock that 

 I have seen in situ in the Crewkerne district that is referable 

 to some hemera between murchisonce and yarantiance hemerfe is 

 ironshot rock (0 to 4 inches thick) in places attached to, or filling 

 fissures in, that of murchisonce hemera. 



Such rock is seen at the Misterton Limeworks (3), the quarry 

 near Misterton Church (9), and at the Ten-Acres-Field Quarry ((5). 

 Where the surface of the underlying Murchison<e Beds could be 

 examined it was found to be waterworn and iron-stained. In 1914 

 I remarked that this ironshot rock was either of bradfordensis or of 



1 L. Eichardson, Proc. Geol. Assoc, vol. xxvi (1915) p. 73. 



2 S. S. Buckman, Q. J. G. S. vol. lxvi (1910) p. 79. See also L. Richardson, 

 ibid. vol. lxxi (1915-16) pp. 479-80. 



3 Emended from Geyeria — S. S. Buckman, ' Yorkshire Type Ammonites ' 

 vol. ii, pt. ix (1913) p. iv. 



