384 Herman Friele 
of the Terebratulina and the Waldheimia appears to justify 
this devision, at least as far as concerns Terebratulinæ and 
Magasine, though it will of course be necessary to transfer those 
with «reflected loops< and among these the Waldheimia to the 
group of the Magasine, and Terebratulina will contain only 
those with simple and not refleeted loops. 
Pg. 59 in «Videnskabs-Selskabets Forhandlinger« for 1875 
I made the observation that Megerlia Jeffreysia Dall is no 
doubt the young af Waldheimia cranium. At Dr. Jeffreys's I 
happened last winter to see Mr. Dall's type-specimen, and I 
readily admit that this is no W. cranium, though the con- 
struction of the loop-complex is quite the same; they differ in 
size, in the form of the septum, hinge-plate, and in the shape 
of the margin of the hinge. The specimen did not look like 
a mature one, the needle-shaped appendages, so peculiar to the 
young were still adhering to the anterior ends of the la- 
mellæ and Mr. Ths. Davidson informs me in a letter that he 
considers it to be the young Megerlia sanguinea Chem. 
When Mr. Dall in «American Journ. of Conch.« pg. 65 
describes the species «without a septum in either valve,« there 
is reason to believe that he has also had the young of Wald- 
heimia cranium before him in the same stage as that illustrated 
in Pl. 2 Figs. 6 and 7. 
The resemblance between. the young Megerlia sanguinea 
(M. Jeffreysi Dall) and Waldheimia cranium and between 
Waldheimia septigera and Terebratella spitzbergensis endicates 
a great accordance in the development of the genus of Maga- 
sine, and it is of interest to observe that on T. spitzbergensis 
Pl. 6 Fig. 1? a remnants of the lateral walls are still left on 
the lamel-processes at their point of connection with septum, 
which signifies an earlier stage precisely like that m Wald- 
heimia. 
I have succeeded in collecting a complete suite of quite 
young Waldheimia, but my examination of these have not yet 
