MACRTJROUS DECAPODA OF THE SUDANESE RED SEA 383 



Nobili regards the category B specimens of Paulson as synonymous with 

 //. orieutalis, Heller, which Kemp (1914) suggests is possibly a synonym of 

 H. ventricosus, M.-Ed. From the latter as red escribed by Kemp, my speci- 

 mens differ in having a much shorter rostrum. In H. ventricosus the rostrum 

 is equal in length to the antennal scale and much longer than the antennular 

 peduncle. In my specimens the rostrum is only as long as the antennular 

 peduncle and much shorter than the scale. There are also differences in the 

 proportions of the joints of the carpus and in the antennal scale, audit seems 

 useful to indicate these by the following table, in which I have incorporated 

 measurements made from Kemp's figures. 



H. ventricosus. H. variant. II. proteus. 

 Anteuual Scale — 



L : B 30 3-5 325 



Joints of Carpus 1 30 2-6 2-0 



„ „ 2 1-0 DO 1-0 



„ 3 1-7 1-4 1-3 



2nd joint of Carpus L :B .. 1-0 2-0 1*5 



At the same time it is only just to point out that my specimens are not 

 fully grown, and the proportions of the joints of the carpus may change 

 with age. The rostrum is well known to be of very variable form in species 

 of this genus. I record my specimens under the name H. proteus, rather 

 with the idea of indicating their structure, than from any conviction that 

 the species is really distinct from H. orientalis, Heller, or II. ventricosus, 

 M.-Ed. 



Family PAL^MONICE. 



Subfamily Poktosiinj:, Kingsley, 1 878. 



Genus Pal^emonella, Dana, 1852. 



Pal&monella tenuipes, Dana, 1852, p. 582, pi. 38. fig. 3. 



P. tenuipes, Nobili, 190G a, p. 70. 

 P. tenuipes, BoiTadaile, 1917, p. 358. 



Localities. Station V. P, one specimen, 10 nun. Station VII. C, three 

 specimens, 10-17 mm 



Remarks. I think this is certainly the species recorded by Nobili as 

 P. tenuipes, Dana. The main points of difference from Dana's description 

 and figures are: — (1) The relatively longer palm to the chelse of the second 

 pair of legs; (2) the merus is armed with a spine at the distal extremity of 

 the lower border only ; (3) Dana makes no mention of the minute teeth on 

 the fingers of the chelaj noted by Nobili and present in these specimens. 



