406 



KEY. A. M. NOEMAN AND ME G. S. BEADY 



the valves. Abdomen short and broad, having the supero-pos- 

 teal angle very greatly produced, so that the claws take their 

 origin at a part considerably removed from the most distal por- 

 tion of the abdomen, superior margin edged with articulated 

 spines ; claws very long and slender, gently curved, and finely 

 pectinated throughout their length, but not having any spine 

 at the base. Length, -^-th of an inch. 



In the male the first feet are furnished with the peculiar falci- 

 form process, and also with a large simple hook, exactly similar 

 in form to the male clasping organ of the same feet in Lynceus 

 sphcericus. 



Anchistropus emarginatus is a very curious species. It was 

 sent to us, in 1863, by Mr. D. Robertson, who found it in the 

 Paisley Canal, near Glasgow. It had just previously been dis- 

 covered by Herr G. 0. Sars in Norway ; but has not, so far as 

 we are aware, been noticed elsewhere. 



EXPLANATION OF PLATES. 









PLATE XVIII. 



Fig. 



1. 



Lynceus elongatus, x 84. 



Fig. 



2. 





costatus, x 84. 



Fig. 



3. 





exiguus, x 120. 



Fig. 



4. 





falcatus, x 100. 



Fig. 



5. 





lsevis, x 84. 



Fig. 



6. 





guttatus, x 100. 



Fig. 



7. 





testudinarius, x 84. 



Fig. 



8. 





nanus, x 120. 



Fig. 



9. 





uncinatus, x 84. 



PLATE XIX. 



Fig. 



1. 



Lynceus 



rostratus, x 84. 



Fig. 



2. 



Monospilus tenuirostris, x 84. 



Fig. 



3. 



Lynceus 



tenuicaudis, x 84. 



Fig. 



4. 



Anchist 



•opus emarginatus, x 84. 



