606 SUMMARY OF CURRENT RESEARCHES RELATING TO 



adults, to arrange tbcm genealogically, as the following tabular 

 arrangement shows : — 



Alima Lysioerichthus (with short spines) 



Alimerichtlms Lysioerichthus (with long spines) 



Erichthalima 



Pscuderichthus 



Gonerichtlms 



Unknown Erichthoidina-liko larva. 



The generic characters are then given : while retaining the 

 accented genera new diagnoses are rendered necessary, since im- 

 portant points have been too greatly emphasized. Then follows an 

 analytical key, giving the more prominent diagnostic characters of 

 each genus. 



1. Sixth abdominal somite fused with telson (gen. Proto- 

 squilla n.g.). 



2. This somite distinct. 



Genera, Gonodactylus. 

 Pseudosquilla. 

 Coronida n.g. 

 Lysiosquilla. 

 Squilla. 

 A phylogcnctic table of the adult takes the following form : — 



Squilla 



Squilla (Chloridclla) 



Lysiosquilla 



Ly. (Coronis) 



Coronida 



Pseudosquilla Gonodactylus 



Protosquilla 



This table agrees with that derived from consideration of the 

 larvse. Faxon has reared a Squilla empusa from Alima ; Claus has 

 traced Pseudosquilla from Pseudericlithus ; and Brooks has now traced 



