290 A HISTORY OF EECENT CRUSTACEA 



Alima is the larva of . . . Squilla. 



Alimerichthus Squilla {Chloridella group). 



Lysioerichthus (short-spined) Lysiosquilla, 



Lysioericlithus (long-spined) . Lysiosquilla 



(Coronis group). 



Erichthalima Coronida. 



Pseuderichthus Pseudosquilla. 



Gonerichthus Gonodadylus. 



An unknown form .... Frotosquilla. 



In support of this affiliation Brooks says, ' Faxon has 

 reared a Squilla em'pusa from an Alima larva. The Chal- 

 lenger collections show that the larva of Lysiosquilla macu- 

 lata is one of the short-spined Lysioerichthi ; I have reared 

 Ijysiosquilla (Coronis) excavatrix^ one of the more primitive 

 Lysiosquilloi^ from a long-spined Lysioerichtlius. Claus has 

 figured a series which shows beyond question that at least 

 one species of Pseuderichthus becomes a Pseudosquilla, and 

 the Challenger collections furnish equally good proof that 

 the Chiragra group of Gonodadyli come from Gonerichthus 

 larv^, and I therefore believe that we may very safely 

 assume that all the Lysioerichtlius larv^ are young Lysio- 

 squillce, all the Alima larvee young Squillce, Alimerichthus 

 one of the lower Squillce or Chloridellw, all the Gonerichthi 

 young Gonodactyli, Erichthalima very probably a young 

 Coronida, and all the Pseuderichthi very probably young 

 Pseudosquilloe* 



