REPORT OH THE STOMATOPODA. 
101 
stages of both types the thoracic region is elongated ; there are no traces of appendages 
on the last six thoracic somites ; the hind body is elongated and narrow, and the carapace 
shallow and fiat. This general resemblance to an Alima disappears with the growth of 
the larva, and the fully grown Lysioerichtlius is not at all Alima-Lkc, as its body is short 
and wide, and the carapace so deep that it covers the sides and part of the ventral surface 
of the free body, while the hind body also may be bent forwards and entirely covered by 
the carapace. 
These Erichtki with a deep carapace and a wide flat hind body are very numerous 
and widely distributed, and as they are also among the largest of the Stomatopod larvae 
we may be confident that the) 7 pertain to adults which belong to a widely distributed 
genus, including many species, some of which are among the largest Stomatopods. 
While we cannot feel at all confident that all the genera of adult Stomatopoda are 
kn own, it is highly improbable that these larvae belong to an unknown genus, and we may 
safely refer them to one of the well known genera. Their large size and the presence of 
marginal spines on the dactyle exclude Protosquilla and Gonodactylus, and the 
depression of the hind body excludes Pseudosquilla, and we must therefore refer these 
larvae to either Squilla or Lysiosquilla. 
Claus, as I have pointed out, advocates the first view, but the description which 
follows will show that there is ample internal evidence that they are all Lysiosquilla 
larvae, and this indirect evidence is rendered all the more conclusive by the fact that I 
have reared Lysiosquilla excavatrix from one of them, while the Challenger collections 
enable me to trace another to Lysiosquilla maculata with nearly equal certainty. 
I therefore feel sure that the examination of the descriptions which follow will furnish 
convincing proof that all these Erichthi are young Lysiosquilla, and that all the 
Lysiosquillse pass through the Lysioerichtlius stage. 
The Erichthus larva shown in Claus’s figure 14 is very similar to Lysioerichtlius, but 
it differs from them all in features in which they all agree with each other, and I shall 
give farther on my reasons for believing that it is a Coronida larva, and therefore equally 
related to both Alima and Lysioerichthus. 
As I shall soon show, there is reason for distrusting the accuracy of his drawing of 
the telson of his Erichthus multispinosus, which is also exceptional. 
Lmysiosquilla {Erichthus) excavatrix. — At Beaufort, N.C., U.S.A., where only two 
species of Stomatopoda, Squilla empusa and Lysiosquilla ( Coronis ) excavatrix, are known 
to occur, and where both species are abundant, two types of Stomatopod larvae are also 
abundant, and as there is ample evidence to show that one of these, shown in PI. I. 
fig. 4, is the young of Squilla empusa, it is natural to infer that the other (PI. XL 
figs. 1, 2, 3) is the larva of the Beaufort Coronis, Lysiosquilla excavatrix, of which 
PI. X. fig. 8 represents the adult male. Nearly all the larvae which I found were in the 
stage shown in PI. XI. fig. 1, and all my attempts to rear them in captivity failed, as 
