102 
THE VOYAGE OF H.M.S. CHALLENGER. 
they all died in moulting. The newly hatched young are swept out to sea by the tide, 
and are widely distributed, and the older larvae are seldom found at Beaufort, but I have 
procured a few specimens which serve to connect the youngest stage with a larva 
nearly an inch long, which changed in the house into a young Lysiosquilla excavatnx, 
so that there is little doubt that all the larvae of this type found there belong to this 
species. 
The youngest larvfi which is figured is very similar to Claus’s Erichthus 
multispinosus from the Indian Ocean, although it is much younger, nor do they belong 
to the same species, for Claus’s specimen has eight or nine, and ours only three, secondary 
spines between the intermediate and the submedian marginal spines of the telson, 
although in other particulars there is the closest resemblance between the two. 
It has four distinct well-developed abdominal somites with appendages, while the 
short fifth abdominal somite is not yet separated from the telson. The flagellum 
of the second antenna and the appendages of the last six thoracic somites are 
absent, although the somites are present and equal in length, with the exception of the 
eighth, which is longer than the others. The rostrum is about as long as the carapace, 
and it has two or three small spines on its lower surface. The carapace covers 
all the thoracic, but not the abdominal somites, and its general outline, in dorsal 
or ventral view, is nearly square, but its length slightly exceeds its greatest width, 
and its width between the bases of the antero-lateral spines is less than between 
the bases of the postero-laterals. In profile view (fig. 2) the lateral edges are 
bent downwards below the level of the ventral surface of the thorax, and the chamber 
which is thus formed is deepest at its posterior edge, so that the mid-dorsal outline and 
the lateral edge are wide apart posteriorly, and approach each other in an acute angle at 
the base of the rostrum. On the middle line of the posterior edge there is a slender 
spine a little shorter than the rostrum, and about equal in length to the curved, 
divergent postero-laterals, each of which carries a secondary ventral spine near its base, 
dorsal to which, on the posterior edge of the carapace, there is a small secondary spine on 
each side, as well as one on the lateral edge posterior to the base of each of the long, 
divergent and widely separated antero-laterals, and on the lateral edge about halfway 
between the antero- and postero-laterals there are two secondary spines. The telson is 
considerably longer than wide, with its posterior edge nearly transverse, its anterior edge 
narrow, and with six marginal spines on each side, the first, which is longer than the 
next five, becoming the lateral marginal spine of the adult, is separated from the second 
or intermediate by a wider space than those between the others. The eye-stalks are about 
as long as the eyes, which are narrow with globular tips. The raptorial claw is flat and 
oval, and there, is a large prominent spine close to the proximal end of the carpus. 
The next larva which is shown as seen from the left and below (fig. 3) is con- 
siderably older and larger, and the marginal spines of the rostrum and carapace have 
