DIAGNOSES OF NEW SPECIES OF 



MACRURÜUS DECAPOD CRUSTACEA FROM THE 



„SIBOGA-EXPEDITIOr 



Dr. J. G. DE MAN 



of lerseke, Holland. 



1. Nephrops arafurensis n. sp. 



Station 262. Lat. 5° 53.8 S., long. 132° 48'.8 E. Depth 560 M. ') 



Only one mucli daraaged male was collected: the posterior half 

 of the abdomen is wanting, as also the flagella of the external 

 antennae and the thoracic legs of the Ist pair. 



Cephalothorax and rostrum as in Nephrops Thomsoni Bate, but 

 the lateral teeth of the rostrum are situated posterior to the middle 

 of it. The lateral carinae on the gastric region converge backwards 

 as in Nephrops japonicus Tapp. and are armed each with five 

 sharp spines that are all slightly directed outward. Cephalothorax 

 covered with numerous spines, besides those that exist also in 

 Nephrops Thomsoni. Abdominal terga of the Ist — 4th somites 

 grooved and sculptured as in the european Nephrops norwegicus. 



Thoracic and abdominal appendages resembling those of Nephrops 

 Thomsoni. 



Length of carapace (rostrum included) 56,5 m.m., length of 

 rostrum 22,5 m.m. 



2. Pentacheles trispinosus n. sp. 



Station 38. Lat. 7° 35.4 S., long. 117° 28.6 E. Depth 521 M. 



1) The depth is indicated in metres. 



