136 ARAEOSTERNUS WIENECKII. 



teeth; sternum of the sixth somite longer (in longitudinal 

 sense) than the preceding sterna , having the median part 

 of the posterior margin armed with three acute teeth on 

 each side of a median notch , the lateral parts being con- 

 cave and a little denticulate. 



Internal surfaces of the pleura a little hairy. Exopo- 

 dites of the abdominal appendages of the second , third , 

 fourth and fifth segments foliaceous , that of the second 

 being ovoid and pointed , those of the three remaining be- 

 coming- gradually narrower, all being hairy at both mar- 

 gins ; endopodites of the appendages of the second segment 

 a little shorter than the exopodites , linear and hairy ; those 

 of the remaining rudimentary. Exopodites and endopo- 

 dites of the sixth segment large and broad , as in Palinu- 

 rus Fabr. (s. s.) and forming with the telson the tailfin 

 of our crustacean; their upper surfaces covered with nu- 

 merous longitudinal series of minute tufts of very short 

 hairs, similar to those of the upper surface of the telson. 



Dimensions in millimeters : 



Length of carapace 82 mm. 



Greatest width of it: 50 mm. 



Distance of the antero-external angles of the carapace : 

 28 mm. 



Length of abdomen 105 mm. 



Length of telson 30 mm. 



Length of external antennae 85 mm 



Length of internal antennae 50 mm. 



Length of anterior legs 110 mm. 



Length of sternum 36 mm. 



Breadth of middle sternal segment; 18 mm. 



The only specimen , a male , was presented to Dr. Wie- 

 necke , when visiting the little Rat-Island , near Benkulen 

 (Sumatra) by a man , who said the animal was found by 

 him in the sea, and I allow myself to dedicate it to 

 him who has so greatly enriched our collection of Crus- 

 tacea. 



The family of Loricata should be divided henceforth 



T>Totes from the Ueyden Museum, "Vol. III. 



