539 
Strasbourg,’ and in his labours to enrich and organize the museum 
of the capital of his beloved native province. In this museum it 
was the delight-and glory of his life, and a continual gratification of 
his patriotic feelings, to devote, gratuitously, a large proportion of 
his time and talents to the setting in order one of the most perfect, 
and most methodically arranged collections of organic remains, espe- 
cially those of the oolitic and new red sandstone or Triassic* series, 
that exists upon the Continent. 
In acknowledgement of his services to fossil botany in illus- 
trating the flora of the new red sandstone formation, M. Adolphe 
Brongniart has dedicated to him the genus Voltzia, being one of the 
most characteristic forms of Conifers in that formation, and abound- 
ing in the Grés Bigarré at Sultz les Bains, on the east side of the 
Vosges near Strasburg. f 
In the Ist vol. of the ‘Mém. de la Soc. d’Histoire Nat. de Stras- 
bourg,’ he published a valuable memoir descriptive of the character 
and contents of the new red sandstone at Sultz les Bains. He was 
also the author of some good technical papers connected with his pro- 
fession, published in the ‘ Annales des Mines.’ His observations on 
Belemnites, published in the ‘ Memoirs of the Society of Strasbourg,’ 
and separately as a monograph in quarto, at Paris, 1830, is a mas- 
terpiece of exact demonstrative description and accurate reasoning 
upon the structure and relations of these internal shells of extinct 
Molluses allied to the modern cuttle-fish; not less beautiful and 
exact are his representations and reasoning as to the elopeltis, or 
dorsal lamina of Belemnites, published in the Strasbourg Memoirs. 
In 1836 he published a very ingenious memoir on the curious fossil 
shells long known by the name of Trigonellites and Tellinites pro- 
blematicus, and recently called Aptychus, showing them to be the 
opercula of Ammonites. In the Solenhofen quarries he has recog- 
nized nine kinds of these shells, and altogether twenty-five species of 
them, which he reduces to three groupst. He shows the internal 
structure in each group of Aptychus to differ from that of every 
known shell, and to resemble that of opercula. He does not, how- 
ever, infer that all the genera of Aimmonites possessed opercula. I 
know not any more beautiful example of inductive reasoning and 
sound logical conclusions than those which pervade the argument 
pursued in M. Voltz’s memoir on these problematic Tellinites, which 
have so long perplexed all preceding observers}. 
All these works show M. Voltz to have been a Paleeontologist of 
the first order, possessing great powers of exact observation, with a 
mind capable of pursuing processes of refined and difficult analysis, 
and acute to discover analogies, and draw sound and logical conclu- 
sions from the oftentimes difficult and complex premises before him. 
* See Alberti’s Monographie des bunten Sandsteins, &c. 1834. 
+ Cornei, Imbricati, Cellulosi, ‘Journal de |’Institut,’ 1 sec., Nos. 190, 
196, 202, referable to three families of Ammonites. 
t In 1829, M. Riippell had shown that one of the forms of Aptychus 
from Solenhofen was the operculum of a Planulite. 
