OF THE PUKBECZ FOEMATTON. 319 



Unfortunately there is much difficulty in correlating several of 

 the above-mentioned species. In the first place, Eomer gives the 

 heak to one only, and Dunker figures all as being healced more or 

 less distinctly ; secondly, the outlines given by the two authors dis- 

 agree in nearly every case. 



In the British Museum are some specimens, from Obernkirchen 

 and the Deister ; and a careful examination of them gives me the 

 following species (associated with Estheria elliptica, Dunker) : — 



1. Cypridea punctata (Forbes), as figured in the Appendix of my 



Monogr. Poss. Estherise, pi. 5. figs. 26-30. I presume that 

 Eomer's fig. 20 and DunJier's figs. 27 & 28 may have been 

 drawn from variously modified (and partially imbedded ?) 

 individuals of this species. 



2. Dunkeri, n. sp. Presumably Eomer's fig. 24, and cer- 

 tainly Dunker's fig. 31, represent a good species, which is 

 not Sowerby's " granulosa" and therefore has been renamed 

 in the sequel (p. 339). 



3. Cyprione Bristovii, gen. et sp. nov., and 1 These two may pos- 



4. Darwinida^ leguminella (Porbes). J sibly have been in- 



cluded under the " Cypris ohlonga " of Eomer and Dunker; 

 but Eomer's fig. 21 and description fall short of the reality 

 of the first, and do not illustrate the second ; and Dunker's 

 fig. 2Q, though nearly like the first in outHne, is markedly 

 heaJced, and therefore diverges, either really or by misadven- 

 ture, from it and still more from the second form mentioned, 

 which, however, is very abundant, and would readily furnish 

 material for Dunker's fig. 24 — a little Cypridiferous slab, of 

 natural size. 



5. Cypridea granulosa (^ow.),--=f asciculata (Porbes), also occurs 



in these Hanoverian shales at Miinden f, though not men- 

 tioned or figured by Eomer and Dunker. This, we shall 

 see, is a true Purbeckian species in England. 



note, a very short time before his death, in reply to some inquiries I bad 

 made : — 



"The Cypris striatopunctata, Ed. Forbes, is altogether different from C. 

 striatopunctata, Eomer : see Dunker's ' Monographie ' &c., where the latter is 

 sufficiently well figured. Unfortunately I cannot send you a specimen, as the 

 originals were borrowed by me and have long ago been returned. Your new 

 species from the English Purbeck [judging from figures suppHed] has nothing 

 in common with the C. striatopunctata of Eomer. In my opinion the Wealden 

 of Hanover, and of North Germany in general, is equivalent to the Purbeck of 

 England." 



Communicated to me by Dr. Brockmeier, at the request of Madame Dunker, 

 March 18, 1885. 



* The generic name " Barwinella^^ was given by Brady and Robertson to a 

 very interesting Ostracod to which this Pur beck -Weald en form is distinctly 

 related. The same name, however, has been used already for a Sponge by 

 Fritz Miiller ; and " Darwimda " has been suggested by a friend, and approved 

 of by G. S. Brady, as a substitute. See further on, p. 346. 



t Perhaps these belong to the " Miinder-Mergel," described by Struckmann 

 as transitional between the Portland and Purbeck formations. See Geol. Mag. 

 dec. 2, vol. viii. 1881, p. 479. 



