1018 The American Naturalist. [November, 
The Lysiopetalide seem to be in need of careful generic revision. 
The result would probably be the recognition of several new genera 
from Europe and Western Asia. Recently Dr. C. Verheeff has at- 
tempted to arrange some of the European species‘, and with his usual 
disregard for the association of generic names with their typical species 
has placed Lysiopetalum fetidissimum under a subgenus Silvestria, 
while other species unknown to Brandt form the basis of the subgenus 
Lysiopetalum, sensu strictu. The conjecture is offered by Dr. Verhceff 
that Lysiopetalum carinatum Brandt belongs in the latter subgenus, and 
if this is really the case there is no need of a new generic or subgeneric 
name. According to Berlese Callipus rissonius Leach (1826) is a 
synonym of Lysiopetalum carinatum Brandt, but the earlier designation 
having priority, Dr. Verhceff’s second subgenus seems to be entitled to 
a name seventy years old. - 
The late Mr. C. H. Bollman conjectured from the description of 
Callipus that it is the same as Lysiopetalum, and proceeded to form the 
names of the family and superfamily accordingly. Mr. Pocock has 
adopted this suggestion. However, it seems clear that we must identify 
a type species for Callipus, or it is a nomen nudum, and may be 
neglected ; also, if we are to use the name Callipus we must accept Ber- 
lese’s identification until reasons to the contrary are shown, and the 
meagre description of Callipus will make these hard to find. I have 
examined a specimen purporting to be Lysiopetalum carinatum Brandt 
and agreeing with the original description, as far as that goes. The 
differences between it and the specimens of fetidissimum are very con- 
siderable and render it probable that the two genera may be maintained 
on sufficient characters when a careful study of the European forms 
has been made. In the meantime we may accept the three genera as 
distinct, and continue the use of the older name Lysiopetalidz, which 
would need to be resumed in case it were at any time proven that 
jetissimum represents a generic type distinct from rissonius, whatever 
that may be. 
The genus Eurygyrus C. L. Koch may also prove to be distinct, and 
the enormous species Platops xanthina Newport evidently represents an 
independent generic type, if the analogy of other Diplopoda does not 
fail in the Lysiopetalide. The genus Platops Newport was founded, 
according to Pocock, on Lysioptalum lactarium Say, and so becomes a 
synonym of Spirostrephon. Two other genera, Cylindrosoma Gray 
* Zool. Anzeiger, XVIII, p. 207. 
* Studi Critici dei Chilognati, etc., Part I, Julidæ, p. 31. 
