REPORT ON THE STOMATOPODA. 
45 
very imperfectly described, and it has unfortunately been lost ; but his description and 
the figures which were afterwards published by Milne-Edwards, show such a close resem- 
blance to Lysiosquilla excavatrix , n. sp., described below, that there can be no doubt of 
their very intimate relationship or of the importance of the differences between them and 
Dana’s Lysiosquilla inornata, upon which this author based his genus Lysiosquilla , which 
has broad triangular eyes, large antennary scales, filiform appendages to the last three 
thoracic legs, and the larva of the closely related Lysiosquilla maculata has a short rostrum 
and postero-lateral spines; while Lysiosquilla ( Coronis ) excavatrix has small subcylindrical 
eyes, minute antennary scales and uropods, dilated appendages to the last three thoracic 
limbs, and the rostrum and postero-lateral spines of its larva are very long. 
Notwithstanding these important differences the various species agree in many 
features, such as the presence of numerous spines on the dactyle, and of very few between 
the submedian and intermediate spines of the telson, in the loose articulation of the wide 
flat hind body, and the absence of dorsal carinae. They cannot be arranged in two 
divergent groups, and it is impossible to draw any abrupt line between them. There 
can, therefore, be no doubt of the propriety of including them in one genus, as Miers 1 
does, retaining Dana’s term Lysiosquilla for all of them. 
The higher and lower forms stand in precisely the same relation to each other as do 
Squilla and Chloridella, and there is also a most suggestive similarity in the character of 
the differences. In fact it is almost as difficult to detect generic differences between 
Coronis and Cliloridella, as between the latter and Squilla, or between Coronis and 
the higher Lysiosquilla. 
The two genera Squilla and Lysiosquilla are divergent stems from a common stalk, 
and while the higher forms are quite distinct, the resemblance between the lower forms 
is no more than we should expect. 
While there can be no doubt that all the very wide Erichthi with a deep infolded 
carapace are Lysiosquilla larvae, w T e cannot state with confidence that all Lysiosquillse 
have larvae of this type, for there are no strongly marked and constant differences between 
the Lysioerichthus and the Gonerichthus and P sender ichthus, and it is not impossible 
that some of the narrow elongated Pseuderichthi may be Lysiosquilla larvae. 
In some of the Lysiosquillae, and possibly in all of them, there are marked secondary 
differences between the sexes. 
Lysiosquilla maculata (Fabricius) (PI. X. figs. 1-7). 
The Challenger collection includes four specimens of this well-known and widely 
distributed species; one full-grown male, No. 1, presented by the king of Amboina ; 
a half-grown male, No. 3, from Amboina, and a mature male and female, No. 2, from 
1 Miers, On the Squillidse, p. 3. 
