ARAEOSTERNUS WIENECiar. 135 



by the narrow fifth segment of the sternum, bearing a 

 conical verge on the under surface; meropodites rather 

 cylindrical, carpopodites comparatively longer than those 

 of the fourth pair, having the distal end of the under 

 margin armed with a small lamellar tooth. Like those 

 of the second pair, the other ambulatory legs are very 

 hairy, with longer yellow hairs on the upper and under 

 margins of the various joints. Abdomen similar to that 

 of Palinurus Fabr. s. s., a little longer than the carapace, 

 the upper surfaces (terga) of the joints very convex, not 

 sulcate , and (the tergal facets excepted) provided with nu- 

 merous very small tufts of short hairs , Pleura of the first 

 segment with a concave external margin and obtuse an- 

 terior and external angles. Anterior part of the pleura of 

 the second segment (pleural facet) with rounded anterior 

 margin , separated from the much larger posterior part by 

 a triangular notch , external (posterior) angle acute , ex- 

 ternal margin denticulated anteriorly. Pleura of the third 

 segment rhomboïdal with a nearly straight deuticulated 

 external margin , with the external (posterior) angle acute, 

 and the posterior margin nearly straight. Pleura of the 

 fourth and fifth segments nearly similar to one another, qua- 

 drangular , with rounded antero-external angle , acute pos- 

 tero-external angle , and a small acute tooth on the middle 

 of the external margin. Pleura of the sixth somite trian- 

 gular with rounded antero-external margin , the posterior 

 being concave and denticulated. Telson quadrangular, a 

 little longer than broad, the anterior third calcified and 

 provided with numerous small tufts of short hairs as on 

 the terga of the other segments, the remaining part mem- 

 branous with numerous longitudinal series of very small tufts 

 of short hairs. Posterior margin of the sternum of the first 

 abdominal segment with three teeth , the median being depres- 

 sed and rather strong ; posterior margins of the sterna of 

 the second and third somites with several small lateral teeth 

 and one median which is a little stronger ; those of the fourth 

 and fifth segments also with some small acute nearly equal 

 Notes from the X^eyden Museum, Vol III. 



