﻿CRETACEOUS BRACHIOPODA. 



29 



'has obtained this shell from the Chalk-marl of Watlington, Oxon, nor is it very 

 uncommon in the Red Chalk of Hunstanton. It occurs in the Upper Greensand 

 and Gault, and Mr. Meyer informs me he has met with specimens in the Lower 

 tjreensand of Guildford in Surrey. The Rev. T. Wiltshire has found it in the Red Chalk 

 of Speeton. It is a common fossil on the Continent. I collected it from beds corre- 

 sponding with those of the Upper Greensand, or " Etage Vraconien," at Ese, between 

 Nice and Monaco, and in the Upper Neocomian, or " Urgo-Aptien," at Drap, near Nice. 

 I have it (T. pectoralis) from the Hils Conglomerate of Essen an der Ruhr, also from 

 the Tourtia of Gussignes and Tournay, Belgium [Ter. Gussigniensis, D'Arch.), from the 

 Upper Chalk of Stenaken, Holland, and the Lower Chalk of Rouen and Havre. 



I am uncertain whether we should not maintain the Kingena Hebertina of D'Orb. 

 (Cret. Mon., PI. IV, fig. 18), from the Upper Chalk, as a distinct species or variety; it 

 tapers more towards the front than do the generality of specimens of K. lima. The 

 question will demand further consideration. 



24. Terebratulina striata, Wallenberg. Dav., Cret. Mon., PI. II, figs. 18 — 25 



(not 26), 27, 28 ?. 



Dr. Schloenbach, in his ' Beitrage zur Palaontologie der Jura- und Kreide-Eormation,' 

 1866, proposes that the term chrysalis (Schlotheim) should be substituted for that of 

 striata, as being the oldest designation given to the species, and he adds a lengthened list 

 of synonyms. I am ready to admit that the figures in Faujas's work, to which Schlotheim 

 has referred us, do represent a very young stage of the shell under description ; but as 

 the name striata is in general use it should, I think, be retained. 



According to Mr. Meyer there seem to be two species in the English Chalk, one 

 elongated and large, the other small and indented; but he does not know how to 

 separate them, and is quite content to leave them provisionally under one name as I have 

 done. T. striata is very variable in shape, as is the case with T. caput-serpenfis, and I 

 have seen many specimens that, had they been found alive or recent, would have been 

 attributed to Linne's species. In general the front line of T. striata is slightly indented 

 in the middle, and this corresponds with a slight longitudinal depression in one or both 

 valves. The same thing occurs in the larger number of specimens of T. caput-serpentis. 

 In this last, as well as in T. striata, we find examples with a straight and even 

 slightly rounded front ; and in such cases the longitudinal depression above described 

 is absent in the dorsal valve, and but slightly defined in the ventral one. There exists, 

 therefore, very little difference between the recent and the fossil shell. T. pentagonalis 

 (Phillips) was named, but not described, by Phillips in p. 178 of the ' Geology of 

 Yorkshire,' from a single valve stated to have been obtained from the Chalk ; and the 



