MACRUROUS DECAPOHA OF THE SUDANESE RED SEA. 389 



Harpilius beaupresi (Audouin, 1826, Descr. Egypte, Hist. Nat. I, 4, 

 p. 91, pi. 10. fig. 4). (PI. 28. fig. 8.) 



H. beaupresi, Borradaile, 1898 6, p. 386 ; and 191 7, p. '-',79. 

 II. beaupresi, Nobili, 1900 a, p. 03. 



Locality. Suakin, Station VII. A, five .specimens, 10-16 mm. 



Remarks. The rostral formulas of the specimens are '-, ^, -, ~, and ^. All 



these specimens have a spine on the lower surface of the basal joint of the 

 antennular peduncle. Nobili was unable to find a similar spine in the speci- 

 mens he examined. II. beaupresi is at once distinguished from the other 

 species of the genus ])y the extreme length of the spine on the outer corner 

 of the joint from which the antennal scale springs. The form of the dactylus 

 (PI. 28. fig. 8) of the last three pairs of legs is characteristic. It is stout, 

 slightly curved, swollen at the base, and equal in breadth at its base to the 

 propodns to which it is attached. 



Savigny's original figure shows the form of the dactylus very well, but 

 I refigure it here to compare with other species of the genus. 



Distribution. Previously recorded from the Red Sea by Audouin, Heller, 

 Paulson, and Nobili ; Persian Gulf (Nobili) ; East Indies (De Man). 



Harpilius depressus (Stimgson). (PI. 28. fig, 7.) 



Harpiliopsis depressus, Borradaile, 1917, p. 380. 



Locality. Station VII. C, 1 ? , 18 mm. 



Remarks. The identification of this specimen is based on Borradaile's 

 monograph (1917), but I am doubtful of the distinctness of this species from 

 II. lutescens, Dana. Except for the fact that this specimen has two teeth on 

 the lower margin of the rostrum, I can find no marked character in which 

 it differs from Dana's species. The discrepancy in the form of the second 

 maxilliped 1 have already attempted to explain. The present specimen has an 

 arthrobranch on the third maxillipeds. It is to be noted in this connection 

 that Nobili records Dana's species from the Red Sea, without comment. 



The species differs from //. beaupresi in its more robust form, in the 

 shorter spine on the outer corner of the joint bearing the antennal scale in 

 the shape of the antepenultimate joint of the third maxilliped, and in the 

 stouter form of the List three pairs of thoracic legs and their dactvli. The 

 latter are short, stout, and curved, and apparently capable of being- almost 

 retracted into a socket at the base of the propodus (PI. 28. fio-. 7). The 

 whole arrangement recalls the claws of the carnivora and is found in 

 77. lutescens, II. depressus, II. gerlacliei, and //. consobrinus. In II. beaupresi 

 the last thoracic legs are much more slender, and there does not appear to be 

 a socket at the apex of the propodus for the retraction of the claws. 



On the ventral surface of the thorax, between the bases of the first pair of 



