Mr. C. Spence Bate on British Edriophthalmous Crustacea. 151 



1. D. porredus (mihi). Upper antennahdM. as long as the body. 



Second gnathopod with a long, straight, spine-like thumb 

 proceeding from the posterior extremity of the palm. Hands 

 not armed in female. 

 Macduff, Mr. Gregor. 



2. D. falcatus (mihi). Upper antenna as long as the animal. 



Thumb at the extremity of the palm, crooked. 

 Macduff, Mr. Gregor. 



Family IX. Caprellidae. 

 With the pleon rudimentary. Coxse fused with the body of 

 the animal. 



Genus 1. Proto (Leach). 

 Legs developed on each segment of the pereion. 



1. P.pedata (Leach). The palm of second gnathopod convex, 



and slightly denticulated. 

 Moray Frith, Rev. G. Gordon. Plymouth, C. S. B. 



2. P. Goodsirii (mihi). The palm of second gnathopod concave. 

 Moray Frith, Rev. G. Gordon. 



Genus 2. Protella (Dana). 



With legs reduced to a rudimentary state on the third and 

 fourth segments of the pereion. 



1. P. longispina, Kroyer. 



^gina longispina! (Kroyer). Caprella spinosa"? (Goodsir). 

 C Phasma"? (Latr.). 



With four long spines on the three anterior segments. 

 Plymouth, C. S. B. 



Genus 3. Caprella (Lamarck). 

 Has no legs developed on the two middle segments of the 

 pereion. 



1. C. linearis (Latr.). Without spines or rostrum. 

 Weymouth, P. H. Gosse, Esq. Wales ; Plymouth, C. S. B. 



2. C. Pennantii (Leach). With a rostrum. 

 Plymouth, Mr. Boswarva. 



3. C. tuberculata (Goodsir). Spine on head; four tubercles on 



the fourth segment. 

 Strangford Lough, Thompson {Annals, 1847). 



4. C. lohata (Miiller). 



5. C. acuminifera (Edwards). 

 C. ucanthifera (Leach), 



With three spines on the back of each of the four central 

 segments, two near the centre, and one at the posterior extremity 



