﻿104 ME. S. S. BUCKMAN ON CERTAIN JURASSIC [Feb. I9IO, 



and lacks the characteristic valve-junction. Nor is there any one 

 among the small Mhynchonellce figured from strata of about the 

 date of our species by Botto-Micca l or Meneghini 2 that is 

 comparable, llh. frontalis, E. Deslongchamps, 3 is also about a 

 contemporary, but it has a feeble likeness to the Dorset species : 

 it has only ribs around the margin, differs in proportions, lacks 

 the very sinuous valve- junction, and so on ; nevertheless it forms its 

 mesial fold in somewhat the manner of the Dorset form. 



Remarks. — I discovered this interesting little species in the 

 aalensis beds of the Bridport Sands of Chideock Quarry Hill in 

 the year 1893, and have distributed specimens under the present 

 name (or something similar) to various Brachiopodists, who, like 

 the late Mr. J. F. Walker and Mr. Charles Upton, have since been 

 able to confirm the horizon of the species. 



Although the name pentaptycta is given for the five plaits on 

 the dorsal fold, there is, of course, variability in this respect. 

 Of 88 specimens collected during the first visit there were the 

 following forms : — 



Character. Number. Per cent. 



With four plaits 15 17*5 



five do 29 33 



six do 27 305 



seven do 17 19 



Locality, etc. — Chideock Quarry Hill, near Bridport (Dorset), 

 in the upper part of the Bridport Sands, with fine-ribbed aalensis- 

 like Ammonites (see section, stratigraphical paper, p. 60). Its date 

 is, therefore, aalensis hemera (Aalenian). It occurs at various places 

 round the hill where its bed is exposed ; and would no doubt be 

 found at Burton Bradstock, if the sands were accessible. 



A few notes on certain species may be appended to these 

 descriptions. 



There are certain species of Brachiopods that are almost peculiar 

 to the Irony Bed {blagdeni zone, Bajocian) of Louse Hill, near 

 Sherborne (Dorset), and are hardly known anywhere else in this 

 country, which are met with in the Untere Dogger vom Rothen 

 Stein of the Yilser Alpen. They are as follows : — 



Glossothyris bifida (Rothpletz). The author gives the name 

 Terebratula bifida 4 to a form which he distinguishes from T. curvi- 

 concha, Oppel. Prof. Bothpletz's species is probably what we have 

 been calling Glossothyris curviconcha = T. carvicoucha, Davidson, 

 App. to Suppl. (1884) pi. xviii, fig. 15. 



1 ' Foss. d. Strati kL. opatmum' Boll. Soc.Geol. Ital. vol. xii (1893) pp. 185 

 ct segq. & pi. i. 



- ' Foss. ool. d. Mte. Pastello ' Atti Sci. Tosc. Sc. Nat. vol. iv (1879) pi. xxii. 



3 ' fit. crit. Bracb. nouv.' Ball. Soc. Linn. Norm. vol. vii (1862) pi. v, 

 p. 30 & figs. 7-8. 



^ ' Geol.-pal. Monogr. Vilser Alpen ' Paloeontographica, vol. xxxiii (1886) 

 p. 114 & pi. v, figs. 17-19 (only). 



