REPOET ON THE STOMATOPODA. 
109 
latter reaching beyond the tip of the extended telson. The carapace has a long median 
dorsal spine, and it exposes the posterior half of the third abdominal somite. 
Length of carapace on middle line including rostrum, . . -50 inch. 
Length of exposed hind body, ..... -20 „ 
Total length from tip of broken rostrum, 
Length from tip of rostrum to tip of posterodateral spines, . 
"Width of carapace between bases of posterodateral spines, . 
Width of hind body, . . . . . 
•70 
•78 
•26 
•16 
5 ? 
In addition to the larvse which have been described, the Challenger collection contains 
numerous specimens from various localities, which must represent closely related adults. 
It also contains specimens of two somewhat peculiar larval types, which join to their 
distinctive characteristics so many features which are shared by all the Lysioerichthus 
larvse that I place them in this group. 
One of them, which is represented by several specimens from Rio Janeiro, is shown in 
profile view in PI. IX. fig. 11, and in dorsal view in PI. XI. fig. 6, while the telson, the 
raptorial claw, and the seventh thoracic limb are shown in figures 7, 8, and 9. It is a 
little younger than Claus’s Squillerichthus triangularis / but it belongs to the same or a 
closely related adult. The dactylus of the raptorial claw of the oldest specimen in 
the Challenger collection is smooth, but in Claus’s larva six marginal spines were 
visible underneath the cuticle. This, as well as the width and flatness of the hind 
body, the depth of the carapace, and the ventral infolding of its lateral edges, and 
the shape of its telson and uropods (fig. 7) show its close relationship to the 
Lysioerichthus larvse which have already been described, and the flat oval raptorial 
claw (fig. 8) and the dilated oval scale-like form of the appendages to the exposed 
thoracic limbs of the older larvse (fig. 9), indicate that the adult is one of the lower or 
Coronis-like species of the genus Lysiosquilla. In Claus’s larva, which is slightly more 
advanced than the oldest one in the Challenger collection, the raptorial claw exhibits 
under the cuticle indications of six marginal spines, and this author therefore regards it 
as the young of one of the six-spined species of Squilla (p. 131). The fact that the young 
Lysiosquilla excavatrix has a smaller number of marginal spines than the adult male, 
shows that the presence of six spines in the larva is no evidence that they are not 
more numerous in the adult, and while it is true that most of the adult Lysiosquillse have 
more than six spines, and that some of them have less, there are several species in 
which the adult has only six. Claus says (p. 131) that the telson of this larva exhibits 
the Squilla- type, but as all known species of Squilla and all the Alima larvse have 
numerous secondary marginal spines between the submedian and intermediate marginal 
spines of the telson, while our specimens, as well as the one figured by Claus, have only one 
such secondary spine, its relationship is obviously with Lysiosquilla rather than Squilla. 
1 Metamorphose der Squilliden, fig. 13. 
