122 A HISTOEY OF EECENT CEUSTACEA 



of form are undergone during progress to the adult con- 

 dition, tliat, 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, Heieroarypta Malhani, 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 Travailleur 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 Maltzani. 



