378 Mr. E. J. Miers on Malaysian Crustacea. 



yet in the adult males in the Museum collection these are 

 never so prominent as in 8. Haani. 8. Haani is also distin- 

 guished from the majority of specimens of 8. cequinoctialis by 

 the form of the antepenultimate joint of the antenna;, which is 

 arcuate and dentated on its outer margin, and by the ex- 

 istence of strong spines on the inner margin of this and the 

 penultimate joint ; but there is a specimen from Madeira in 

 the Museum collection which remarkably approaches 8. 

 Haani in these respects ; and it is possible that the examination 

 of a sufficiently large series would show that the four forms 

 above cited are but varying conditions of one species ranging 

 widely through both the Atlantic and Indo-Pacific regions. 

 The bicarination of the antepenultimate joint of the second 

 pair of legs in 8. Sieboldii is not, I believe, a character of 

 specific value. 



From 8. latus this species is distinguished not only by 

 the prominent tubercles on the thorax and postabdomen, but 

 by the different form of ihe terminal joint of the antennas, the 

 absence of distinct serrations on the outer margin of the ante- 

 penultimate joint, the more distinctly carinated legs, and the 

 truncated form of the lateral prolongations of the second, third, 

 and fourth postabdominal segments. 



Parribacus antarcticus (Lund). 

 New Guinea (two young females). 



Thenus orientalis. Humph. 

 W. Borneo (a female). 



Palinurus {PanuUrus) fasciatus (Fabr.). 



W.Borneo (a female and young male). A larger female 

 is in the collection, without locality. 



Palinurus {PanuUrus) omatus (Fabr.). 



Indo-Malayan seas (a female, without locality). 



A male and two very young individuals from Amboina 

 perhaps belong to this species, although in them the original 

 coloration has entirely disappeared ; also a young individual, 

 probably male, from New Guinea. In the younger indivi- 

 duals the external genital openings are not distinguishable ; 

 and I consider the New-Guinea specimen to be a male only on 

 account of the uniramose appendages of the postabdominal 

 segments. In young specimens, also, the rudimentary median 

 spines of the rostral plate are absent. In an adult male of 

 large size from the Pipon Islands (Cape Melville) in the 



