EEPORT ON THE STOMATOPODA. lOl 



stages of hoth types the tliora(;ic region is elongated ; there are no traces of api)enflages 

 on the last six thoracic somites ; the hind body is elongated and narrow, and the carapace 

 shallow and flat. This general resemblance to an Aliina disappeai-s with the growth of 

 the larva, and the fully grown Lysioerichthus is not at all Alima-like, 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 EHchthi with a deep carapace and a wide flat hind bod}' are very numerous 

 and widely distributed, and as they are also among the largest of the Stomatopod larvae 

 we may be confident that the)' pertain to adults which belong to a widely distriljuted 

 genus, including many species, some of which are among the largest Stomatopods. 



"^Vliile we cannot feel at all confident that all the genera of adult Stomatopoda are 

 kno'WTi, it is highly improbable that these larvse belong to an unknown genus, and we may 

 safel}' 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 

 larvse to either Squilla or LysiosquiUa. 



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 LysiosquiUa 

 larvae, and this indirect evidence is rendei'ed all the more conclusive by the fact that I 

 have reared LysiosquiUa excavatrix from one of them, while the Challenger collections 

 enal:)le me to trace another to LysiosquiUa 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 LysiosquiUa, and that all the 

 LysiosqniUw pass through the Lysioerichthus stage. 



The Erichthus larva shown in Claus's figure 14 is very similar to Lysioerichthus, 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 belieAang that it is a Coronida larva, and therefore equally 

 related to both Aliina and Lysioenchthus. 



As I shall soon show, there is reason for distrusting the accuracy of his drawing of 

 the telson of his Erichthxis muUispinosus, which is also exceptional. 



LysiosquiUa {Erichthus) excavatrix. — At Beaufort, N.C., U.S.A., where onl}' two 

 species of Stomatopoda, SquiUa empusa and LysiosquiUa (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 SquiUa emptisa, it is natural to infer that the other (PL XI. 

 figs. I, 2, 3) is the larva of the Beaufort Coronis, LysiosqidUa excavatrix, of which 

 PI. X. fig. 8 represents the adult male. Nearly all the larvse which I found were in the 

 stage shown in PI. XI. fig. 1, and aU my attempts to rear them in captivity failed, as 



