Post-larval Development of the Spiny Lohsters. 445 



longitudinal lateral bands are always conspicuous. In the 

 genera] pattern of their coloration the Puerulus-^ovm'i agree 

 exactly with the youngest specimens o£ PanuUrus. In three 

 out of the five specimens collected by Dr. Andrews this 

 pattern is very conspicuous, and in the other two, which are 

 much paler, it can still be traced. In all, the ground-colour 

 is a more or less rich brown and the lighter bands and spaces 

 are yellowish or light buff. The lateral longitudinal bands 

 (which do not coincide with the lateral ridges of the cara- 

 pace) and the convergent bands completing the W are very 

 well marked ; the abdominal somites have each a light band 

 posteriorly, with a fainter indication of the narrow marginal 

 dark band seen in the young PanuUrus. Further, if the 

 carapace of one of the more darkly pigmented specimens of 

 the Puerulus-ioxva. be examined under a lens, numerous 

 darker spots can be seen, which correspond exactly in their 

 arrangement with the spines on the carapace of a PanuUrus of 

 similar size. These spots no doubt represent the rudiments 

 of tiie spines in course of development under the semi- 

 transparent cuticle. 



Boas states tliat the specimens of the Natant-stage examined 

 by him represented several species belonging to both the 

 longicorn and the brevicorn types of Palinurid^. It does 

 not seem possible at present to refer any of the other 

 '■'■Puerulus " species to definite species of adult Palinuridas. 

 Perhaps the " Puer atlanticus'^ of Bouvier { = PanuUrus 

 inermisj Pocock) may be the young of PanuUrus guttatus 

 (Latr.), in company with which it has been found (Pocock, 

 IBouvier), and which it resembles in having a reduced 

 exopodite on the third maxilliped. 



In the British Museum collection are four specimens of a 

 Palinurid in the Natant-stage from Stewart Island, New 

 Zealand, which I suppose to belong to a species of Jasus. 

 These have the general facies of the " Puerulus " forms 

 described above, the integument being soft and semitrans- 

 parent, the carapace somewhat depressed, with a longitudinal 

 ridge on each side and with a small number of spines ante- 

 riorly. There is, however, a well-marked median rostral 

 tooth, which is bent downwards, but does not reach the 

 antennular segment as it does in the adult Jasus. Traces of 

 exopodites are found on all but the last pair of legs. 



The conclusions reached may be summed up as follows : — 



(1) Puerulus, Ortmann, 1897 { = Puer, Ortmann, 1891), 

 is a valid genus of Palinuridse, of which the type species is 

 P. avgulatus, Spence Bate. It agrees with Linuparus, 



