Rev. A. M. Norman on a new Genus of British Hydrozoa. 261 



Aristotle, partly because to have done so would have been to 

 anticipate the results of a wider inquiry. Probably many other 

 members of this class were known to Aristotle than those he has 

 named; probabl) 7 , also, these unknown animals have, by taking 

 a share (whose limits it is useless to attempt to define) in the 

 descriptions we have been studying, helped to increase the con- 

 fusion and uncertainty. 



The following table contains the systematic classification of 

 the Malacostraca mentioned by Aristotle, and their probable 

 equivalents. The classification is that of Heller, op. cit. 



Crustacea Podophthalmia. 



Brachyura. Portunus depurator, =ol napKivoi ol piicpol. 



Linn. (De Part. iv. 8). 



1 Cancer pagurns, Linn. —TLayovpoi. 

 Thelphusa fluviatilis, =ot KapKivoi ol ttotu- 



Latr. pioi. 



Pinnotheres veterum. =7riwo(pv\a^. 

 IMaia Squinado. = pa1a. 



? ='HpaKAecoTiKot. 



Ocypoda cursor. ='l7rn(i>s. 



Aiionnua. Fam. Pterygura. Eupagurus Bernhardus, = t6 KapKivwv to tu>v 



Brandt. o-Tpopftcov. 



Diogenes varians,Costa. = to tcou vrjpLrcov. 

 Macrura. Fam. Loricata. tScyllarus. ~| 



Palinurus vulgaris. > = Kapa(ios. 



?Fam. Thalassinidse. 



Fam. Astacidae. Homarus vulgaris. 1 , , 



iJMepliroj)s norvegicus. J 



Astacus, flu viatile form. =oi daraKol ol irora- 

 pioi. 

 Fam. Caridse. Crangon vulgaris. =17 Kap)s fj Kvqbrj. 



IPalcemon squilla "I 



IPenceus caramote \ = 1 fapis 77 Kv(prj. 



IStenopus spinosus J 



? = TO KCipiSlOV. 



Anomobrancliiata. Fam. Squillidae Squilla mantis. =rj tepdyyuv. 



Incert* sedis «f I =0 } fy™' 



L f =0 KvAAapos. 



XXVIII. — On Merona, an undescribed Genus of British Hydrozoa. 

 By the Rev. Alfred Merle Norman, M.A. 



Class HYDROZOA. 



Fam. Clavidae (Allman). 



Genus Merona*, nov. gen. 



Trophosome. — Ccenosarc consisting of erect or semierect simple 

 tubes, which arise at intervals from a creeping, filiform 

 * Nomen arbitrarium proprie assignatum. 



