48 
THE VOYAGE OF H.M.S. CHALLENGER 
large, widely distributed, transversely banded larva is the young of Lysiosquilla 
maculcita, which is one of the largest and most widely distributed Stomatopods. The 
value of this identification can be much better estimated after examination of the 
section on Stomatopod larvge. 
Lysiosquilla ( Coronis ) excavatrix , n. sp. (PL X. figs. 8-16). 
Diagnosis. — Body depressed and loosely articulated ; whole dorsal surface smooth. 
Carapace, with rostrum, making of the total length from tip of rostrum to 
tip of telson. Eyes nearly cylindrical, with hemispherical cornese. Scale of second 
antenna about -y^y of total length. Raptorial claw of second maxilliped oval, with 
fourteen or fifteen short curved pointed teeth and a much longer terminal tooth on 
dactylus, and three movable spines on inner side of base of second joint. Second thoracic 
somite with a blunt rounded lobe on each side. Appendages of third, fourth* and fifth 
pereiopods ovate, that of the fourth being largest. Sixth abdominal somite with a long 
acute process on each side, near anterior edge. Telson smooth, nearly rectangular, with 
one median and two pairs of lateral subacute lobes. Endopodite of sixth abdominal 
appendage triangular, basal prolongation ending in two simple acute curved spines, the 
outer much the larger. Larva a long-spined Lysioerichthus. 
General Description. — The carapace is smooth on its dorsal surface, with the gastric 
sutures distinct from the anterior edge to the transverse cervical suture, behind which no 
longitudinal sutures are visible. The space included between the gastric sutures is wide 
and makes up rather more than two-thirds of the total width of the carapace. This 
is elongated and slightly narrowed anteriorly, with the antero-lateral angles nearly 
right angles and the postero-lateral angles broadly rounded. The anterior edge of the 
carapace is nearly transverse, and it is very deeply emarginated on the middle line 
behind. Its length on the middle line is T ^, and its greatest breadth about y 1 ^ of the 
total length. The rostrum is a little longer than wide and the lateral edges are not 
angulated, but are strongly convex in outline and regularly curved to the base of the 
short acuminate tip. The rostrum completely covers the ocular somite, and hides the 
base of the eyes. The first antennary somite ends laterally in long slender acute 
spines, which curve outwards and forwards. 
The first antennae are very short and their shafts are hidden nearly to the 
tips below the eyes, which are small, subcylindrical, with terminal hemispherical 
corneaj, and are usually directed forwards side by side. The second antennae are almost 
as long as the first, and the oval scale is very narrow and short, its length being only 
rB'Uo °f the total length of the body. 
The second joint or propodus of the raptorial claw is broad, with an obscure longitu- 
dinal ridge on its outer surface, and when the dactylus is closed the claw is oval and. nearly 
