10 The American Naturalist. (January, 
yy, Clitellum 14-17 ; Teleudrilus, 
999999998, Male pores on somite 20; 
clitellum 14-25 ; Urobenus. 
In explanation of the above key it may be said that the peris- 
tomium is regarded as the first segment. The prostomium is 
~ sometimes separated from the first somite by a transverse groove; 
but frequently grooves start on the prostomium and extend back 
into the first somite, so that the prostomium appears “ dovetailed” 
with the peristomium. If the grooves stop after traversing the 
first somite for a short distance, the prostomium is partially dove- 
tailed. The external openings of the sperm ducts are the male 
pores. The term sperm sacs is applied to the vesciculz semi- 
nales, the testes of the older authors; the prostates are diverticula 
of the sperm ducts near their satel opening. 
There are several genera which are not included in the abawa 
summary. Thus Garman has described’ a genus Diplocardia, 
from Illinois, which belongs to the family Acanthodrilide, but 
differs from Acanthodrilus in having the dorsal vessel paired 
throughout its entire length, and in the absence of a subneural — 
blood-vessel. It agrees with Dinodrilus in the double dorsal | 
vessel, but differs in having but eight seta. Garman also men- 
tions the existence of Pericheta in Champaign, Ill. A species, — 
apparently of the same genus, occurs in Lafayette, Indiana, where — 
it caused the students no little trouble to make it fit the description | 
of Lumbricus given in Brooks’s Zoology. 
A paper by Michaelsen ê has not been seen. It describes sev- 
eral African forms of the family Eudrilide, among them a 
genus Stuhlmannia. Allied to is another African genus lately 
described by F. E. Beddard? It is called Hyperiodrilus, and 
presents many interesting peculiarities of reproductive organs’ 
1 Garman, H. On the Anatomy and Histology of a New Earthworm (Diplocardia com- 
munis). Bulletin Illinois State Laboratory of Natural History, III., pp. 47, 5 plates. 
8 Jahrbuch der Hamburg wissinsch. Anstalten, Bd. VII. 
* Beddard, F. E. Preliminary Note on a New Earthwo 
rm Belonging to the Family 
Eudrilidæ. Zool. Anzeiger, XIL., 1890. ie | 
