25 



76 mm. Alcock's specimen was 80-5 mm. long, and Faxon's 

 99-5 mm. A specimen of P. duhius (= granulatus) taken at the 

 Azores reached the length of 112 mm. (Bouvier). 



The following are the dimensions of the single Irish specimen': 



Length 



76 mm. 



Length of carapace 



. 36 mm. 



Length of abdomen 



40 mm. 



Breadth of carapace 



29-5 mm. 



Length of chelipeds 



. 92 mm. 



Length of ischium of chelipeds 



15 mm. 



Length of menis of chehpeds 



. 25-5 mm 



Length of carpus of chelipeds 



18 mm. 



Length of propodite of chelipeds 



. 29 mm. 



Length of palm of chelipeds 



13-5 mm 



Length of dactyl of chelipeds 



15-5 mm 



Length of second pereiopods 



31 mm. 



Length of third pereiopods 



. 29 mm. 



Length of fourth pereiopods 



25 mm. 



Length of fifth pereiopods 



19 mm. 



Length of antennules 



58 mm. 



Length of antennae 



54 mm. 



There seems to me to be no doubt that P. Beaumontii, Alcock, 

 is merely a synonym of P. granulatus, Faxon. Alcock (1894) 

 gives the following four distinctive characters for his species : — 

 (1) Great breadth of carapace ; (2) the diminutive size of anten- 

 nulary scale ; (3) the deficient spinature of the median carina 

 of the carapace : (4) the great length of the chelipeds. Of 

 these, the first, third, and fourth are equally characteristic of 

 Faxon's species, and as the latter writer points out (1895) 

 the form of the antennules of Alcock's specimen must have been 

 due to ■' malformation or mutilation." The figure of P. Beau- 

 montii {Investigator, 1894) appears to support this view, and in 

 his later description (1901) Alcock says : — " The antennular 

 scale appears to have been of the broad t}^pe of P. gihhus and 

 P. Carpenter i.'' 



The Irish specimen is in many respects intermediate between 

 P. granulatus and P. Beaumontii. P. dubius (Bouvier) is also 

 clearly a synon^Tn of P. granulatus ; it appears to agree very 

 closely with the Helga specimen. More doubtful is the case 

 of P. eryoniformis, Bouvier, in which there are faint ridges 

 behind the orbits, and " carenes branchiales armees de fortes 

 spinules " which are quite wanting in the other specimens. 



Stebbing (1908) mentions specimens from about 40 miles 

 N.E. of the Cape of Good Hope, which he doubtfully refers 

 to P. Beaumontii ; from his description, however, I do not think 

 they can belong to that species. His specimens have two spines 

 at the outer angle of the basal peduncular joint of the antennules, 

 and also di:ffer in other points. 



General Disirihution. — The species has been recorded from the 



