134 Mr. A. O. Walker on the Lysianassides 
Fig. 3. Posterior end of body of Pontoscolex arenccola. Nn, nephridio- 
pores; A, anus; a, “growing region” figured by Schmarda as 
clitellum. 
Fig. 4, Extremity of spermatheca of Diacheta littoralis, a, large peri- 
toneal cells, 
Fig. 5. A spermatheca of the same species. 
Fig. 6. A spermatheca of Pontoscolev arenicola, sp., pouch communi- 
cating with exterior by long duct. 
Fig. 7. Sete of Anteus heterostichon. a, clitellar seta; 7 d, its free extre- 
mity more highly magnified ; b, one of the ordinary setee drawn 
to same scale as a6. extremity of this seta more highly mag- 
nified, 
Fig. 8. Sete of Geoscoleax mavimus. a, aseta from one of the terminal 
serments of the body; 6, free extremity of one of the clitellar 
setee. 
Fig. 9. Ventral aspect of elitellar and neighbouring segments of Mega- 
scolex cingulatus, for explanation of which see text. The seg- 
ments are numbered. 
Fig. 10. Megascolex cingulatus. Spermatheca. Sp., the main pouch of 
the spermatheca; d, diverticulum ; d’, diverticula of this; 0, ex- 
ternal orifice. 
Fig. 11. The smaller diverticula of one side of the same, more highly mag- 
nified. 
Fig. 12. “ Prostate” of the same, showing the duct given off from the 
anterior end. 
Fig. 13. Penial seta of the same. a,a seta; b, the free extremity, more 
highly magnified. 
XVITI—The Lysianassides of the ‘ British Sessile-eyed 
Crustacea, Bate and Westwood. By Aurrep O. 
WALKER. 
HAvinG lately been enabled, by the courtesy of the British 
Museum authorities, to inspect the collection of Amphipoda 
presented by the late Mr. Spence Bate to that institution, I 
venture to lay the results, so far as the Lysianasside are 
concerned, before your readers. 
The collection consists of one hundred and fourteen tubes, 
containing Amphipoda, Caprellida, and two species of 
Praniza. The specimens are in methylated spirits. All the 
names are in the handwriting of the late Mr. Spence Bate, 
and are those of species included in the ‘ Brit. Sess.-eyed 
Crust. ;’ but many of the species in that work are not to be 
found in the collection. Time and London fog did not permit 
me to examine more than the Lysianassidz, and the two 
species afterwards noted. It must be understood that the 
examination had to be carried on without dissection ; never- 
theless in most cases [ was able, by immersing the specimen 
in glycerine, to make out the details with sufficient accuracy. 
I take the specimens in the order and with the names given 
