﻿Vol. 66.'] SPECIES OF AMMONITES AND BRACHIOPODA. 101 



years ago, and with his usual kindness distributed specimens among 

 his friends under this MS name, to which I have pleasure in giving 

 effect us a small tribute to a generous friend. The figured specimen 

 belongs to Mr. J. W. D. Marshall's collection, being one of a series 

 of the species presented to him. 



Locality, etc. — This small species occurs in some abundance in 

 the top beds of the Inferior Oolite of Vinney ( Vetney) Cross, of Burton 

 Bradstock, and of other localities near Bridport (Dorset) ; it is also 

 found at Broad Windsor, Bradford Abbas, Louse Hill, and many 

 other places in Dorset and South Somerset. Its date is approxi- 

 mately schloenbachi. 



Terebratula avhaddonensis, 1 nom. now (PI. XII, figs. 15 & 16.) 



1882. Terebratula Infra-oolitJiica, S. Buckman (non E. Deslongchamps), Proc. 

 Dorset Nat. Hist. & Ant. P.-C. vol. iv, p. 15. 



Description. — A nearly circular, somewhat tumid, biplicate 

 Terebratulid. Side-margin curved, and anterior margin forming a 

 distinct M fold. Beak short, with distinct beak-ridges ; it barely 

 overhangs the dorsal umbo, and is well separated from it, showing 

 rather wide deltidial plates; foramen small. 



Distinction. — When compared with Deslongchamps's type- 

 figure of T. infra-oolithica 2 and with specimens from Conde-sur-Sarthe, 

 one of Deslongchamps's special localities, the English examples show 

 several slight but noticeable differences. They are more circular, 

 being less acuminate posteriorly, the beak and beak-area being 

 broader, shorter and blunter; they are more tumid, especially the area 

 of the dorsal umbo ; they have a more curved side-margin and more 

 distinct folds ; while the beak has more distinct beak-ridges. But 

 there is a further difference, that of punctation, although too little 

 attention has been paid to this matter yet, and its significance is 

 riot understood. However, in T. infra-oolithica the punctae are 

 arranged in very close, slightly waving lines, the spaces between 

 the lines being very narrow. . In T. ivhaddonensis the punctae are 

 arranged in irregular waving lines, which are distinctly separated 

 by plain spaces. 



Locality, etc. — The species is fairly common in the sandy grit 

 of Stoke Knap (Whaddon Hill) near Broad Windsor (Dorset), and at 

 Little Silver near Haselbury (Somerset), it has occasionally been 

 found at Chideock Quarry Hill and at Burton Bradstock, in the strata 

 below the scissum bed. The date of the beds which yield T. ivhad- 

 donensis has not been determined with the accuracy required for 

 modern work, but scissum-opaliniformis expresses it approximately : 

 they are apparently about on the line between the beds of these two 

 dates. As T. infra-oolithica is said to come from opalinus beds by 

 Deslongchamps, but from murchisonce beds by Dr. Brasil (label with 

 specimens), its date may really be Ancolioceras , and so there may 

 be some difference in date between it and T. ivhaddonensis. 



i Wbaddon Hill is the native name for the eminence known as Stoke Knap. 

 2 In A. d'Orbigny's 'Ten-. Jur. : Brachiopodes ' (Pal. franc.) pi. lvii, fig. 7. 



