Zoology. 1031 
sesses considerable morphological interest when taken in connection 
with the method of formation of the “ heart ” in many Arthropods, 
e.g., Branchipus (Claus) and Oecanthus (Ayers). The paper con- 
cludes with a valuable catalogue of the known American species 
of earthworms, which we summarize here: 
amily Lumpricip#.—Genus Tetragonurus Eisen, T. pupa 
Eisen. Genus Allolobophora Eisen, A. beckii Eisen, A. riparia 
Hoffmann, A. fetida Savigny, A. subrubicunda Eisen, A. mucosa 
Eisen, A. turgida Eisen, A. tenuis Eisen, A. tumida Eisen, A. 
parva Eisen, A. nordenskioldii Eisen. Genus Lumbricus Linné, 
L. herculeus Sav., L. rubellus Hoffmann, L. purpureus Eisen. 
Family ACANTHODRILIDZ.—Genus Diplocardia Garman, D. 
communis Garman. 
b Family PLUTELLIDÆ.—Genus Plutellus Perrier, O. heteroporus 
errier, 
Family PERICHÆTIDÆ.—Genus Pericheta. Mr. Garman states 
that an undetermined species of this oriental genus has been accli- 
matized in the green houses at Champaign, Ill. 
on either side of the “stomach,” which resembled the “shell-gland” 
of the Entomostraca. The opening of the gland occurred at the 
of the second maxilla, and its lumen contained concretions of 
urates (so shown by Murexide test) ; points which demonstrated its 
homology with the shell-gland of the Entomostraca. This is its 
rst recognition in the Malacostraca, though the author found it 
later in Porcellio, Idotea, Nesæa, Cymothoa, and Jeera. 
E Larva or Prorevs.—Dr. Ernst Zeller has been so 
fortunate as to have a Proteus anguineus lay seventy-six eggs in 
captivity, from which in ninety days two larvee hatched. Accord- 
tng to his description in the Zoologischer Anzeiger (Bd. XI., p. 570, 
1888), the larvæ when hatched were more developed than is the 
case in Amblystoma and the “ Axolotl,” and measured 22 mm. in 
length, of which five belonged to the tail. The general appear- 
ance was much like that of the adult. The pale red gills are 
shorter and less developed than in the adult; the anterior limbs 
are well developed and three-toed, but the hinder pair are still 
stump-like. The development of the small black eyes is notice- 
able, as is also the development of pigment in various regions © 
the A few points are mentioned concerning the embryonic 
