ON A COLLECTION OF MACRUROUS DECAPOD CRUSTACEA 



OF THE SIBOGA EXPEDITION, 

 CHIEFLY PENAEIDAE AND ALPHEIDAE 



BY 



Dr. J. G DE MAN, 



Ierseke. 



With four Plates. 



INTRODUCTION. 



This' paper deals with a Collection of Macrurous Decapod Crustacea of the Siboga 

 Expedition, which were sent to the author in the second half of 191 6 and in January 191 7; it 

 consists chiefly of species belonging to the Penaeidae and Alpheidae. The Collection contains 

 38 species, among which 2 new species and 2 new varieties ; one of the most interesting is 

 no doubt the rare Sicyonella inermis (Paulson), of which a young male and a young female 

 were collected. Preliminary descriptions of the new species and varieties were already published 

 in 1920 in: Zoölogische Mededeelingen uitgegeven vanwege 's Rijks Museum van Nat. Historie 

 te Leiden, Deel V, Afl. 3, p. 103 — 107. 



The figures have been made by the author, excepting the figures 3 — ^d (PI. I), 13, 13a 

 (PI. III) and 18—18^ (PI. IV), that were dravvn by Mr. J. F. Obbes of the Hague. 



54839 



SIBOGA-EXPEDITIE XXXIX il 4 . 



