8 



ENDEAVOUR SCIENTIFIC RESULTS. 



A special feature of this species LS the presence of an 

 out ward -pointing, transversely-placed spine on the inner 

 margin of the upper sinus of the orbit, or at the posterior 

 end of the preorbital lobe. This spine is not present in the 

 species figured as P. wyville-thomsoni by Alcock 6 or by 

 Doflein.7 



In the type-specimen, the carapace is covered by numerous 

 granules, a few of which are enlarged into tubercles ; the 

 only spines are around the anterior border or on the anterior 

 part of the branchial regions. The two branchial regions 

 are well separated from each other. 



Xotes on the Australian specimens. The chief difference 

 between the specimens taken by the w ' Endeavour " and the 

 type-specimen is the enlargement of the more elevated 

 tubercles into small spines, as follows : 4 on the gastric 

 region, of which 2 are median and 2 in a transverse line a 

 little in advance of the anterior of the median spines ; 2 

 cardiac, arranged transversely ; 1 branchial (paired) in line 

 with the gastro-cardiac suture ; besides there are a few 

 smaller spines or spinules, e.g., 1 branchial (paired) in front 

 of the above-mentioned, 1 or 2 gastric (paired) not far 

 behind the orbit. 



The ambulatory legs of the male are considerably longer 

 than those of the female. 



Allied species. P. wyvillethomsoni of Wood-Mason and 

 Alcock. Chun. 8 and Doflein may be known as P. alcocki, 

 nom. nov. A small specimen received from the Indian 

 Museum is in the United States National Museum and 

 another in the British Museum. In all its stages this species 



6. Alcock Illus. Zool. Investigator, Crust., part iv., pi. xvi. 



7. Doflein- Brachyura Valdivia, vi., 11104, pis. ii., xx.-xxiii. 



8. Chun Aus den Tiet'en des Weltmeeres, ii., Jena. 1903. text-tig, on 

 p. 400. 



