142 Mr. C. Spence Bate on British Edriophtlialinous Crustacea. 



2. D. bispinusa. Second segment of upper antenna not so long 



as the first. Two anterior segments only of pleon produced 

 into a spine. 

 Plymouth, C. S. B. Penzance, — Harris, Esq. Moray, IJeu.G. 

 Gordon. Falmouth, W. Webster, Esq. Macduff, Mr. Gregor. 



3. D. Gordoniana. First segment of posterior pleon furnished 



with a spine. 

 Moray, Rev. G. Gordon. 



4. D. fucicola (Edwards). 



Amphitoe fucicola (Edwards). Pherusa fucicola (Leach). 

 With no dorsal spine. 



Falmouth, JV. Webster, Esq. Youghal, Ireland, R. Ball, Esq. 

 {Ann. Nat. Hist. Oct. 1847). 



Genus 15. Calliope (MS. Leach). 

 Upper antenna without secondary appendage. All the feet with 

 strong semi-prehensile claws. Telson single. Mandible palpi- 

 gerous. 



1. C. Leachii (mihi). Antennae subequal. First and second 

 gnathopoda subcheliform, subequal. 

 Moray, Rev. G. Gordon. Devonshire?, Dr. Leach {Brit. Mus. 

 Coll.). 



Genus 16. Is^a (Edwards). 



Upper antenna with secondary appendage. All the feet pre- 

 hensile. Telson reduced. 



1. /. Montagui (Edwards). Upper antenna rather longer than 

 lower. First gnathopod smaller than second. 

 Plymouth, C. S. B. 



Genus 17. Lembos (mihi). 

 Upper antenna with secondary appendage small. First gnatho- 

 pod larger than the second. First of the posterior pereiopoda 

 very short, the last very long. Telson rudimentary. 



1. L. Cambriensis (mihi). First hand without a thumb. 

 Glamorganshire, C. S. B. 



2. L. versiculatus {mihi). Firsthand without a thumb. Second 



scarcely prehensile, the carpus and meros furnished with 

 a strong brush. 

 Plymouth, C. S. B. 



3. L. Websterii (mihi) . First hand with a thumb on propodos. 

 Falmouth, W. Webster, Esq. 



4. L. Damnoniensis (mihi). First hand with a thumb on carpus. 



