REPORT 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, 

 Length of exposed hind body, 



Total length from tip of broken rostrum, 

 Length from tip of rostrum to tip of postero-lateral spines, 

 Width of carapace between bases of postero-lateral spines, 

 Width of hind body, .... 



•50 inch. 

 •20 



•70 

 •78 

 •2C 

 •16 



In addition to the larvae 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 fi-om Rio Janeiro, is shown in 

 profile view in PI. IX. fig. 11, and in dorsal view in PI. XL 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 LysiosquiUa. 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 

 LysiosquiUa 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 LysiosquiUa 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 SquiUa-type, but as all known species of SquiUa and all the Alivia larvae 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 LysiosquiUa rather than SquiUa. 



1 Metamorphose der Squilliden, fig. 13. 



