Some New or Little Known Oligocheta. 39 
doubtless serve to protrude and retract. There are no 
penial sete. The atriwm is lined throughout by a single 
layer of cells, which are taller and narrower away from the 
external pore. A thick layer of tissue of fibrous appearance, 
with nuclei and interspersed blood-vessels, surrounds the 
lining epithelium. I do not at present lay any stress upon 
the fact that the atrium is lined by a single layer of cells 
only. The fact is, of course, very important if it really 
characterises the species, and is not due to immaturity. 
The racemose sperm sacs hang from the anterior septa of 
segments xi, xii. The ovaries are in xiil.; the oviducts 
open opposite to them and on to the exterior in segment 
xiv. There were no egg sacs. 
There are two pairs of spermatothece, placed respectively 
in segments viii, and ix. They are probably not fully 
mature, though of fair size; each is an oval pouch with 
a single cylindrical diverticulum. 
The above description, necessarily incomplete though it is 
in several particulars, leads me to place this species in the 
genus Pontodrilus. At present this genus is only known by 
two species; the type species is, of course, Pontodrilus 
littoralis of Grube, which is probably the same as Perrier’s ? 
Pontodrilus marionis. More recently the genus has been 
shown to inhabit the New World by Michaelsen and by 
myself. Michaelsen® described a second species of the genus 
under the name of Pontodrilus arenae, which species is 
identical with that called by myself Pontodrilus bermudensis.* 
I am inclined, moreover, to refer to the same genus Giard’s 
species ° Photodrilus phosphoreus. Rosa® has called attention 
to the great similarity that exists between the two genera; 
1 Ueber neue oder wenig bekanuten Anneliden—Arch. f. Nat., Bd. xli., 
Dp. 127. 
Btades sur l’organisation des Lombriciens terrestres: iv. Organisation 
des Pontodrilus (E. P.)— Arch. Zool. Ezp., t. ix., p. 175. 
’ Terricolen der Berliner Zoologischen Sammlung, ii.—Arch. f. Nat., 1892, 
p- + Z 04 ’ 
4 Abstract of some Investigations into the Structure of the Oligocheta— 
Ann. Mag. Nat. Hist., Jan. 1891, p. 96. 
° Sur un nouveau genre, ete.—Compt. Rend., 1887. 
® Sui Generi Pontodrilus, Microscolex, e Photodrilus—Boll, Mus, Tor., 
Viwill. 
