392 
THE GEOLOGIST. 
was predicted a month before by a distinguished Trench geologist, nam 
Brayard, who, nevertheless, is believed to have perished in the ruins. 
M. Brayard occasionally visited Mendoza, and wrote to a friend residing a 
Parana, that, having examined the city in a meteorological and geographical 
point of view, he had ascertained that it was situated between two extinct 
volcanos, and in the centre of a double current of electricity, from which he 
concluded that probably before ten years Mendoza would disappear. 
Many distinguished men perished in this earthquake, among others, Martin 
Zapata, an orator of note. 
On the Clytia Leachii, a long-tailed decapod of the chalk for- 
mation. By Prof. Relss. Prom the Transactions of the Imperial Academy, 
Yienna, vol. vi. — In the chalk-formation of Bohemia, next to the Callianmsa 
antiqiia, of Otto, which is found in quantities in the sandstones of north-eastern 
Bohemia, belonging to the upper chalk, the above-named species, Clytia 
Leachii, is the most numerous of the few crustaceans as yet found therein. 
This species seems to belong to the chalk beds known by the name of Planer 
Kalk, which belong to the middle qauder-marls of Geinitz (Terrain Turonien 
of d'Orbigny). At least, as yet, I have never been able to discover them 
Manteli, in his "Possils of the South Downs," 1822, p. 221—3, pi. xxix., 
figs. 1 — 4, pi. xxx, figs. 1 and 2, pi. xxxi., figs. 1 — 4, figures and describes the 
earliest known specimens of this species, discovered in the white chalk of Lewes 
and Houghton in "West Sussex, and gives it the name of Astacus Leachii. 
Plate xxix, figs. 1—4, represent the most distinct specimens, ^\ holly 
corresponding with the remains discovered in Bohemia : they are claws. Plate 
xxix, 4, shows the claws of a very large specimen. Plate xxx., fig. 2, and 
PI. xxxi., fig. 4, show the claw of each side opposite one another. Of the 
other limbs nothing distinct can be learnt from the di'awing. 
That fig. 5, of pi. xxix, really belongs to this species is improbable, on account 
of the crookedness of the claw. 
Plate xxxi., figs. 1 — 4, represent the cephalothorax, which, however, seems 
to have been very incompletely preserved, and is also very indistinctly drawn, 
so that one cannot say with certainty whether it reaUy belongs to the Astacus 
Leachii. PL xxxi., fig. 3, which shows most distinctly the crossline of the 
cephalothorax, most probably belongs, I fancy, to Astacus Leachii. 
In fig. 2 of pi. xxxi. we have a line running lengthways, which is not to be 
seen in the much better preserved specimen of Bohemia ; and it would seem, 
if the specimen represented reaUy belong to the same species, that the line was 
accidental, and caused by the pressure to which it may have been subjected. 
In PI. 31, fig. 4, is represented one of the outside feelers, and a very indi- 
stinct claw of one of the forefeet. Nothing decided can be learnt from either. 
Plate xxx, fig. 1, represents the very incomplete hinder end of the body, in 
which can be seen the three penultimate body-rings very much squeezed, 
and the inner tail-pins of the right side in paii's. "VMiether these really are 
derived from the Astacus Leachii, the total insulation of this part and the 
discovery of other Astacides in the same spot do not aUow us to say with 
certainty. 
Some time after Geinitz again discovered tliis crustacean in the 
Planer of Strehlen and "VVeinbdhla, Saxony, and gave a description of a 
fragment from the former of these places, under the name given it by Manteli, 
(Characters of the Chalk Rocks of Saxe-Bohemia, p. 39, pi. ix., fig. 1). This 
fragment consists of a cephalothorax which has been subjected to much lateral 
pressure, and is incomplete in the front part, and a claw of large dimensions. 
Romer in his work on the fossils of the chalk of Northern Germany (p. 105), 
gives a short diagnosis ; but without adding anything new or mentioning any 
