122 A HISTORY OF RECENT CRUSTACEA 
of form are undergone during progress to the adult con- 
dition, that, without a considerable series of specimens, 
young and old of the same species must often almost in- 
evitably be considered as distinct. 
Heterocrypta, Stimpson, 1871, contains but three 
species, and those of small size but singular appearance. 
One of these, Heterocrypta Maltzani, Miers, which has been 
taken at Goree Island, at the Azores, and off Senegambia, 
is also an ornament of the Mediterranean, having been 
taken by the T’ravailleur at a depth of about 250 fathoms 
off Toulon. The Mediterranean form was at first named 
Heterocrypta Marionis, after the distinguished French 
zoologist, but it has since been found to be the same 
species as Heterocrypta Maltzana. 
