Mr. C. SpenceBate on British Edriophthalmous Crustacea. 145 



11. G. lonffimanus (Leach). Second hand much larger than the 

 first, very long, and not narrowing towards the extremity. 

 Last caudal stylets equal. 



{Leach, Brit, Mus, ColL) Belfast, Thompson {Ann, Nat, Hist, 

 Oct. 1847). Plymouth, C. S. B. 



12. G. brevicaudatus (Edwards). Lower antenna not reaching 

 to the extremity of the peduncle of the upper. Last pair of 

 caudal stylets extremely short. 



Plymouth, C. S, B. 



18. G, grossimanus (Montagu). 

 Mcera grossimana (Leach). 



Coxse not largely developed. Hand of second gnathopod very 



large. 

 Plymouth, C, S, B, Devonshire, Montagu* 



14. G, incequimanus (mihi). The second pair of gnathopoda has 

 the left hand four times as large as the right. A dorsal 

 spine on the first segment of the posterior pleon, and two 

 smaller placed laterally on the next. 



Polperro, Mr. Loughrin. 



15. G.t pallidus (mihi). Upper antenna shorter than the lower. 

 Hands large, with dactylos well developed, and fringed 

 internally with teeth. 



Plymouth, C. S. B. 



16. G. maculatus ? (Johnston). 



17. G.t subterraneus (Leach). 

 Well in London. 



Genus 23. Urothoe (Dana). 



Upper antenna scarcely longer than the peduncle of the lower. 

 Coxse moderately developed. Gnathopoda prehensile. The 

 dactylos of the other feet styliform. Telson double. 



1. U. elegans^ (mihi). 



Gammarus elegans (mihi), Brit. Assoc. Report. 

 Hands of gnathopoda very small. Upper antenna shorter 

 than the lower. Last pair of pleopoda with the stylets 

 feathery and subequal. 

 Plymouth, C. S. B. 



* This species scarcely differs from U. irrostratus of Dana, which how- 

 ever, having been taken in the Sooloo Sea, can scarcely be supposed to 

 belong to the same species as the British form. 



Ann. ^ Mag. N. Hist. Ser. 2. Vol. xix. 10 



