490 Herr R. Klebs on the Fauna of Amber . 
Of Araclmoidea at least two thousand five hundred speci- 
mens have been found, the majority of which belong to the 
Araneida, which are remarkably rich in genera and species, 
Herr Klebs mentions that at least six species of the extinct 
genus Archcea have been observed. The Acarina too are 
numerous, and it is interesting to note that Herr Klebs has 
recently discovered an Ixodes . The Phalangida are repre- 
sented by about thirty specimens and the Pseudoscorpionida 
by about the same number. Of the true Scorpions only a 
single example is known, and has been described by Menge 
as Tityus cogenus . Pedipalpi and Solifugae are wanting 
as yet. 
The Crustacea, with the exception of one Amphipod, which 
Zaddach has worked out, are represented by Isopods only. 
About fifty specimens, belonging to a number of genera and 
species, have been found. 
Of larvae and larva-cases some fifteen hundred specimens 
have been found ; but Helminthes, such as Mermis and 
Anguillula , are only occasionally met with. 
The Mollusca are represented by twelve specimens, belonging 
to eleven different species. Among these Herr Klebs has 
distinguished and described the genera Pormocel/a, Hyalina , 
Strobilus , Myorocystis , Vertigo , Balcea , and Electrcea y his 
determinations being for the most part confirmed by Sand- 
berger. In addition to these he has recently acquired a 
couple of beautifully preserved Mollusks ; one of these is a 
Vertigo and the other very closely allied to the large Strep - 
taxids. 
Vertebrate inclosures in amber are extremely rare and are 
principally confined to solitary feathers and tufts of hair ; the 
only other specimen belonging to this group with which Herr 
Klebs is acquainted being a lizard, which Dr. Bottger, of 
Frankfurt, supports him in considering to be very closely 
allied to Knemidophorus, an exclusively American and for the 
most part tropical form. Of the seventeen known species 
one is also found in North America, 
So far as can be judged from the representatives of the 
amber fauna hitherto examined, their nearest allies at the 
present day occur in North America and Eastern Asia. Notably 
is this the case in the Diptera. This fact had already been 
noticed by Low, who, when examining the North- American 
Diptera, discovered isolated representatives of a number of 
genera ( Electra , Ghrysoihemis , &c.) which he had previously 
believed to be exclusively Tertiary. Baron Osten-Sacken 
has since confirmed Low’s conclusions, and in looking over 
the material which Low had collected has discovered very 
yiumerous relations between the amber fauna and that of North 
