24 
LEUCOSIAD^E. 
is not a vestige of this armature. The degree of granulation of 
the different parts also varies. 
With respect to I. inermis of Leach, I see no difference but 
what might be supposed to depend upon great age; and the di¬ 
stinction is really less on examining the actual specimens, than 
appears to be the case from merely a comparison of the figures. 
Under these circumstances, I have ventured to give the references 
to the three supposed species, as synonyms of the old Cancer 
Cylindrus of Fabricius. 
Genus 17. NUCIA. 
“ Carapax parce transversus, antice non productus, latere non 
dilatatus, inermis, superficie paulo tuberculatus, fronte bilo- 
batus et non saliens. Oculi paulo remoti, grandiores,. mar- 
ginales. Area buccalis bene triangulata. Maxillipedis ex¬ 
tend articulus 3tius triangulatus; palpus angustus, extus 
rectus. Pedes toti breves, et crassi, digiti in piano subverti- 
cali claudente, eodem cum manus articulatione.” 
Nucia, Dana, Crust. U. S. Explor. Exped. p. 397. 
1. Nucia speciosa. 
Nucia speciosa, Dana, Crust. U. S. Explor. Exped. p. 397. t. 25. 
f. 5. 
Hab. --? 
THE END. 
Printed by Taylok and Francis, Fed Lion Court, Fleet Street. 
