REPORT OX THE STOMATOPODA. 
19 
inner is always longest in Alima. In Erichthalima they are equal, and both very short, 
as is also the case in some of the more primitive Lysiosquillte, and in Protosquilla. 
It will thus be seen that Erichthalima has certain characteristics which are found 
nowhere else except in Alima or Squilla, and others which are found nowhere else except 
in Lysioerichthus or Lysiosquilla, and others which are common to both, and others 
which are found in neither. We must therefore regard it as a more primitive larva than 
either, equally related to both. 
In the Lysioerichthus series we have forms which, like Alima, have the rostrum and 
postero-lateral spines long, and others which have them short. And in the Alima series 
we have Alimerichthus which has its carapace deep and its telson wider than long, as in 
Lysioerichthus, while the carapace is flat and the telson longer than wide in all the other 
Alimse. 
The relationship between these various larvae may then be expressed in a diagram as 
follows : — 
Alima. Lysioerichthus with short spines. 
Erich thalima. Pseuderich thus. Gonericli thus. 
Unknown Ericlithoidina - like larva. 
This classification exactly matches the one given for the adult Stomatopoda on 
page 12, and, added to the fact that the few larvae which have been traced to their 
