318 BULLETIN OF THE 
After the first moult the larva had the form represented on Plate IV. 
Fig. l. The general shape is very much like the adult, but all the feet 
except the last pair are provided with an outer swimming branch. The 
armature of the carapace is now as follows: two large spines in the 
median dorsal line, the anterior of which lies over the base of the eye- 
stalks ; one on each side near the anterior margin, on a level with the 
eye-stalks ; all of these are directed forward and furnished with minute 
recurved teeth on their lower sides ; in addition to these there is a small 
antennal spine on each side of the carapace on the anterior margin on a 
level with the base of the second pair of antenns, and a very minute 
spine at the antero-inferior angle of the carapace just below the antennal 
spine; this is probably the branchiostegal spine in the adult. The ros- 
trum is furnished with hairs on its upper edge in front of the anterior 
dorsal spine. "The peduncle of the first pair of antenne is now divided 
into three segments ; both the inner and outer branches have increased 
in length. The flagellum of the second pair of antenne (Fig. 2, v i) 
exceeds the scale in length, and its distal half is divided up into six or 
seven segments. The first pair of maxillipeds (Fig. 1, V/) are very 
small compared with the Decapodal legs; the second and third pairs 
increase in length successively. The chelipeds (ZX, X) are terminated 
by a perfect claw, in which the process of the penultimate segment is 
equal in length to the dactylus ; both dactylus and the opponent process 
are furnished with a few plumose sete. The exopod of the penultimate 
thoracic limbs has now attained a size equal to that of the limbs in 
front. The appendages of the abdomen (XIV - XVIII) are much 
larger than before the last moult; a small projection from the inner 
border of the internal rami of the second to the fifth pairs (Fig. 5, s) is 
the beginning of the slender stylet in the adult (Fig. 26, s); both 
branches are now furnished with long plumose hairs ; the inner branch 
of the first pair (Fig. 4, r 2) is rudimentary. 
One individual of the form just noticed died during the process of 
exuviation in one of my aquaria. It sufficed to show that the larva 
after the moult differed in no important regard from the antecedent 
form. "The tooth on the outside margin of the outer blade of the swim- 
merets, which is so conspicuous in the adult (Fig. 29), is beginning to 
appear (Fig. 8). The telson is still armed with three pairs of long 
bristles (Fig. 8); within the inner pair are two of very minute size. 
Length, 8 mm. 
I failed to rear any of the larve in confinement beyond this stage. 
The next form in the series which I have met with is the one repre- 
