62 Dr. Peters — On the Geology of the Dobrudscha. 



under the names of Pentamerus lens, P. liratus, and P. Icevis.^^ I was 

 aware that the P. Icevis of J. Sowerby was the young of P. ohlongus, 

 and supposed that the name had become obsolete as to its first 

 application. In that case Spirifera ? Icsvis, J. de G. Sowerby, which 

 was a true Pentamerus, as the genus was then understood, became 

 P. Icevis. That this is the one I had in view may be seen by the 

 remark quoted from my Pal. Foss., p. 84, by Mr. Davidson in his 

 *' Monograph," p. 158. The sentence is irregular ; but it was in- 

 tended to read thus, " The hinge-line in some of the species, such as 

 in S. Icevis and S. microcamerus, is straight and much extended."^ 

 This could not possibly apply to the original P. Icevis, which has no 

 hinge-line at all ; but it does apply to the figure of Spirifera ? Icevis 

 above cited. There is not the slightest trace of any of the generic 

 characters of StricMandinia in J. Sowerby's figure of P. Icevis, and 

 it is impossible that I could have intended to include it in my genus. 

 Several years before I proposed StricMandinia I was under the 

 impression that P. Icsvis was the young of P. ohlongus from com- 

 paring our own specimens, one of which I have figured (Fig. 3) ; 

 and in 1858 I was informed, I think by Mr. Salter, that it was so 

 regarded in England. 



EXPLANATION OF PLATE IV. 



Tig. l.'—Stricklandima Davidsonii, ventral valve; la, dorsal valve; lb, cardinal 

 extremity ; Ic, side view ; Id, cardinal view of a small specimen, with 

 beaks ground off to show the chamber and septa. 



Fig. 2. — Stricklandinia Salter ii, ventral valve, the right-hand cardinal angle re- 

 stored. 2a, ventral valve, both cardinal angles restored. 



Fig. 3. — Young of Pentamerus ohlongus, from the Niagara limestone at Cockburn 

 Island, Lake Huron. When I read the paper on Stricklandinia in 

 March, 1859, I exhibited to the Natural History Society of Montreal 

 a specimen just .like this, only a little larger, in order to show the 

 difference between Fentamerus and Stricklandinia. — E. B. 



ni. — Notes on the Geology of the Dobeudscha, Bulgaria. 

 By Dr. Charles F. Peters, of the University of Gratz, Austria. 



HAYING lately read some interesting remarks on the well-known 

 green-coated flints of Kent in the Geological Magazine,^ I am 

 induced to offer you the following notes. 



During the summer of 1864 I investigated many parts of Bulgaria, 

 but more especially the Dobrudscha, where the sagacious observations 

 of Capt. T. Spratt, E.N., F.K.S., frequently served me as guides. In 

 the highly interesting Cretaceous strata at Kanara, near Kiistendsche, 

 which had been correctly identified by Capt. Spratt as Chalk,^ and 

 from which Professor Eeuss latety described many Foramtniferce,^ I 

 discovered a pseudomoiphous substance, which replaces the flint at 

 many points along the coast, and in the Kara- su valley. 



^ In the original it is " The hinge-line in some of the species, such as in S. Icevis 

 and S. microcamerus, have the hinge-line straight and much extended." 



' See Mr. G, Dowker's article, Geological Magazine, 1866, Vol. III. p. 210, 

 see also pp. 223 and 239 in same volume. 



3 Quart. Journ. Geol. Soc. Lond., vol. xiv. p. 207. 



* Sitzungsberichte, Wiener Akademie, lii. p. 445. 



