134 ^Ir. A. 0. Walker on tlte Lysianassides 



Fig. 3. ropterior end of body of Ponfuscolex arenicola. n, nephridio- 

 port's ; J, anus ; a, " growiDg region '" figured by Schmarda as 

 clitellum. 



Fiff. 4. Extremity of spermatheca of Diaehceta littoralis. a, large peri- 

 toneal cells. 



Fig. 5. A spermatheca of the same species. 



Fig. G. A spermatheca of Pontoscole.r arenicola. sp., pouch communi- 

 cating ^vith exterior by long duct. 



Fig. 7. Setfe oi Anteus heterostfehon. rt, clitellar seta; 7 cl, its free extre- 

 mity more highly magnitied ; b, one of the ordinary setie drawn 

 to same scale as a ; c, extremity of this seta more highly mag- 

 nified. 



Fig. 8. Setfe of Geoscolex ma.rimus. a, a seta from one of the terminal 

 segments of the body ; h, free extremity of one of the cliteUar 

 setpe. 



Fig. 0, Ventral aspect of clitellar and neighbouring segments of Mega- 

 scolex cinguJatiis, for explanation of which see text. The seg- 

 ments are numbered. 



Fig. 10. Mcgascohx cingnlcdus. Spermatheca. Sp., the main pouch of 

 the spermatheca ; (/, diverticulum ; d', diverticula of this ; o, 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; h, the free extremity, more 

 hiffhlv magnified. 



XVI II. — The LysianassiJes of the 'British Sessile-eyed 

 Crustacea^' Bate and Westwood. By Alfred O. 

 AValkek. 



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 Lysianassidte 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 LysianassidiB, 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 I was able, by immersing the specimen 

 in glycerine, to make out the details with sutlicient accuracy. 

 1 take the sjtecimens in the order and with the names given 



