STOMATOPODA AND DECAPODA OF THE SUDANESE RED SEA. 345 



I. \ 



Report on the Stomatopoda and Macrurous Decapoda collected bj r Mr. Cyril 

 Crossland in the Sudanese Red Sea. By Walter M. Tattersall, 

 D.Sc. (Vict.), Keeper of the Manchester Museum. (Communicated 

 by W. A. Herdman, F.R.S., F.L.S.) 



(Plates 27, 28.) 



[Read 19th June, 1919.] 



The collections of Stomatopoda and Macrurous Decapoda collected by 

 Mr. Crossland in the Sudanese Red Sea were kindly entrusted to me for 

 examination and report by Professor W. A. Herdman, to whom I desire to 

 express my thanks for the opportunity of examining so interesting a 

 collection. The latter comprises 10 species and varieties of Stomatopoda, 

 and 60 species and varieties of Macrurous Decapoda, 8 of wbich, viz., 

 1 AtJianas, 2 Alpheus, 4 Periclimenes, and 1 Nikoides, I have been unable to 

 determine specifically owing to the defective nature and small number of the 

 specimens. Four species are described as new to science — AtJianas cross- 

 landi, Synalpheus quinquedens, Periclimenes calmani, and Upogebia pseudo- 

 chelata, and a farther twelve species are new to the fauna of the Red Sea. 

 These latter are Penceopsis stridulans (W.-M.), Eusicyonia carinata (Oliv.), 

 Athanas parvus, De Man, Synalpheus streptodactylus, Cout., Synalplieus 

 hululensis, Cout., Alpheus bucephaloides, Nobili, Alpheus consobrinus, De Man, 

 Harpilius depressus (Stimpson), Harpilius gerlachei, Nobili, Anchistus inermis, 

 Miers, Leander concinnus (Dana), and Gonodactylus pidchellus, Miers. 



Among the more interesting points brought out by the material in the 

 collection are : — 



The material of Gonodactylus clemani and its variety spinosus suggests that 

 these two forms are constantly distinguished by characters which may 

 ultimately be considered of specific value. 



Gonodactylus brevisquamatus, Paulson is represented by nine specimens, 

 and my observations lend support to Mr. Patience's view that G. fimbriatus 

 of Lenz is synonymous with Paulson's species. 



I am able to supplement Nobili's descriptions and figures of Penceopsis 

 stebbingi and P. vaillanti in some few points. 



My observations on the species of the genus Athanas have led me to 

 suggest a slightly different explanation of the so-called " trimorphism " 

 discovered by Kemp in A. polymorphous and to show that dimorphism among 

 males is exhibited by at least three species of the genus. 



The re-discovery of Synalplieus savignyi, Guer., apparently lost sight of for 

 nearly a hundred years, is a point of some interest. 



LINN. JOURN. ZOOLOGY, VOL. XXXIV. 27 



