I. '08. 51 



further on. The exopods of the maxillipedes are reduced in 

 size ; only those of the second pair now remain longer than the 

 endopods. The first three pairs of pereiopods are faintly 

 divided into segments ; in the first two pairs a rudimentary 

 chela is formed by an outgrowth of the propodus parallel with 

 the dactylus. Five pleurobranchs only can be seen. The 

 last four pairs of pleopods are biramous, short buds at the base 

 of the endopods representing the rudimentary appendices. 

 The telson (fig. 9) is broad and laminar and less than twice 

 as long as wide; apically it is very slightly emarginate, and 

 shows traces of having borne setae. The uropods are now 

 free ; the outer branch is provided with a spine at its outer 

 distal angle, and is about two-thirds the length of the telson. 

 The specimen was about to moult and the much narrower tel- 

 son, characteristic of the later stages, may be seen lying within 

 the broad lamina, which forms such a prominent feature of 

 the earlier larvae. 



It is, of course, obvious that one or more stages, which are 

 not present in the collection, occur betw^een this and the form 

 previously described. 



The other four specimens all measure approximately 15 

 mm. In this stage (fig. 11) the rostrum and carapace together 

 are rather longer than the first five abdominal somites. Dor- 

 sally the carapace is carinate for the greater part of its length, 

 terminating anteriorly in a rostrum which reaches to,, or 

 beyond, the distal extremity of the eye-stalks. The carina, 

 though high, is not very sharp, but as yet there is no trace of 

 the dorsal sulcus found in the adult. Viewed from above, the 

 eyes are still largely concealed by the hooded anterior margin 

 of the carapace. They are now considerably longer than in 

 the early stages, but still show no traces of facets. The an- 

 tennular peduncle is subdivided into its three segments ; an 

 external outgrowth from the basal one represents the lateral 

 process. The flagella have lengthened ; the inner ramus, 

 which is about half the length of the outer, falls short of the 

 apex of the antennal scale. The scale itself is about three 

 times as long as wide and is slightly shorter than the antennal 

 flagellum. 



The mandibles (fig. 12) are still rounded lobes, but the speci- 

 men figured was about to moult, and teeth similar to those of 

 the adult may be seen within the margin of the cutting edge. 

 There is no trace of the palp. The maxillae (figs. 13 and 14) 

 show considerable development. In the first maxillipedes 

 (fig. 15) the exopod is dwindling, being now much shorter 

 than the endopod. The exopod of the second maxillipede 

 (fig. 16) is still well developed and about as long as the endo- 

 pod ; in the latter the dactylus is only obscurely separated 

 from the ^propodus, the other joints being distinctly marked. 

 A short outgrowth from the base of the third maxillipede (fig. 

 17) is the first indication of an epipod ; the exopod is a trifle 

 longer than the ante-penultimate joint. All the joints of the 

 pereiopods are clearly marked ; they have now assumed a form 

 closely resembling that, of the adult ; the chelae of the first two 



D 2 



