Family CRANGONIDAE. 



36. Aegeon orientalis Henderson. 



Aegt'on orientalis J. R. Henderson, A contribution to Indian Carcinology, 1893, p. 446, 



PI. XL, figs. 16, 17. 

 Aegeon orientalis Stanley Kemp, in: Records Indian Museum, Vol. XII, Part VIII, Calcutta 



1916, p. 378. 



Stat. 133. July 25/27. Anchorage oft' Lirung, Salibabu-island. 36 m. Bottom mud and hard 

 sand. 1 young female. 



This specimen is 14,5 mm. long, measured in the middle line from tip of rostrum to 

 tip of telson, the carapace being 4,3 mm. long, the abdomen 10,2 mm.; the latter is almost 

 2Yj-times as long as the carapace. The rostrum, that measures 1 / n the length of the rest of 

 the carapace, hardly reaches to the middle of the eyestalks, not yet to the corneal portion ; 

 the distal margin is truncate, but armed at either angle with a small acute tooth, which measures 

 only 1 / e the length of the rostrum • at the inner side of the right tooth a third, supernumerary 

 of course, is observed, as long as the right, and both teeth are a little smaller than the left. 

 The lateral tooth is placed a little behind the middle of the oblique lateral margins, the distance 

 between the apices of the lateral teeth is 3-times as long as the distance between the two at 

 the distal border of the rostrum. The eyestalks measure one-fifth the length of the carapace, 

 rostrum included ; the corneal portion is 0,6 mm. broad, three-fourths the length of the eye- 

 stalk, distinctly faceted, of a pale colour, while the emargination of the cornea is nearly black. 



The five carinae of the i st abdominal somite and the median carina of the 2 nd terminate 

 each in a small spine. Both on the 2 nd and on the 3 rd somite, at either side of the middle 

 line, the lower half of the tergum, except near the posterior margin, is situated on a lower 

 level than the upper half, the boundary line running with a curve from the antenor margin 

 backward and downward ; this boundary line is regarded by Stanley Kemp as a carina, for 

 he says "there are two longïtudinal carinae on either side of the second abdominal somite". 

 The other carina is formeel by the boundary between tergum and pleuron, but this boundary 

 is rounded and appears therefore hardly as a carina. 



The exopodite of the 2 nd pleopod is 2,5-times as long as broad, the endopodite has 

 the same length as the outer branch, but, being implanted on a lower level, does only reach 

 to the distal sixth of it and is 4-times as long as broad ; the styliform stylamblys presents well- 

 developed cincinnuli at the tip and extends to the distal third of the endopodite. 



General distribution : Gulf of Martaban (Henderson); Persian Gulf (Kemp) ; Port 

 Blair, Andamans (Kemp). 



