44 
THE VOYAGE OE H.M.S. CHALLENGER. 
a third, Chlorida decorata, Wood-Mason, is very briefly and inadequately described, 
and the fourth, Chlorida microphthalma, E. and S., by no means satisfactorily known. 
Our species would belong to the genus if the shape of the eyes were the criterion, but 
it is so perfectly connected with Squilla fasciata, a true Squilla, through the species 
which was last described, Squilla lata, that the propriety of retaining the genus Chlori- 
della must remain very doubtful for the present. A comparison of this species (PL II. 
fig. 1), Squilla lata (PI. III. fig. 1), and Squilla fasciata (PL III. fig. 4), will show 
that no one of these three species should be placed in a genus which does not include 
the other two, and as the last is clearly a true Squilla I have included all three in this 
genus. 
The comparative table of measurements of the three species which is given at the 
end of the description of Squilla fasciata will also serve to show the close resemblance 
much better than a description. 
Genus Lysiosquilla, Dana. 
Diagnosis. — Stomatopoda with the sixth abdominal somite separated from the 
telson by a movable joint ; the hind body depressed, loosely articulated and wide ; the 
dactyle of the raptorial claw without a basal enlargement, but with more than six 
marginal spines ; no more than four secondary spines, and often onty one, between the 
intermediate and submedian spines of the telson, which is usually wider than long ; and 
the outer spine of the ventral prolongation from the basal joint of the uropod usually 
longer than the inner. The larva is an Erichthus or Squillerichthus, with the ocular 
and antennulary somites covered by the carapace ; the lateral edges of the deep carapace 
folded inwards over the ventral surface ; the bases of the postero-lateral spines distant 
from the dorsal middle line ; the hind body flat and wide ; the telson wider than long, 
and with few spines or only one between the intermediate and submedian spines ; and 
the dactylus of the raptorial claw with numerous marginal spines. 
Special Description. — I have examined the first abdominal appendage of the males 
of two species, Lysiosquilla maculata (Pl. X. fig. 6) and Lysiosquilla excavatrix (Pl. 
X. fig. 12), and find such great and characteristic difference from Squilla, that I 
do not hesitate to add to the diagnostic characteristics of the genus the statement that 
Lysiosquilla is distinguished by the fact that the terminal joint of the exopodite of the 
first abdominal appendage of the adult male is subtriangular, with its large outer lobe 
separated by a suture from the very small inner lobe, and the fixed limb of the petasma 
very small and not ending in a hook. 
Like the genus Squilla the genus Lysiosquilla includes two minor groups, a highly 
specialized one and a more primitive and slightly modified one. The single specimen of 
Lysiosquilla ( Coronis ) scolopendra upon which Latreille based his genus Coronis, was 
