308 



typical pennata, hut tho sculpturiiig- is more prominent and the 

 point to wliich the pleura are vertically produced, appears less 

 h/kü-/), on the Ist and 2nd subaeute, on the following rather blunt ; 

 the two submedian carinae of the 5th terg-nm are entire, whereas 

 in the typical penyiata they are armed with a small acute tooth 

 just behind the middle. 



Peraeopods of Ist pair of a stouter shape than those of A, pen- 

 tiat(f, so that the propodiis appears in the latter foiir, in A. Sibof/ae 

 only three tinies as long- as broad in the middle. Second peraeopods 

 reaching by the chela and half the carpus beyond the carpai ar- 

 ticulation of the hand of the Ist pair, carpus a little more than 

 one and a half as long as the chela, the latter 6-times as long 

 as broad, in the typical A. pennata. 4-times ; fingers half as long 

 as the palm. 



Measured in tlie middle line, the carapace appears to be 13,3 mm. 

 long, the abdomen 31,7 mm., entire length 45 mm. 



Aegeon Sibogae, var. intermedia n. 



Stat. 302. 10° 27'. 9 S., 123° 28'. 7 E. Between the islands of 

 Rotti and Timor. 216 m. Bottom sand and coralsand. One female 

 without eggs. 



The female from Stat. 302 differs from the typical species by 

 the following. The large spine at the anterior extremity of the 

 lateral crest of the carapace is as much turned outivards as in 

 the typical A.ptennata (Bate). The antepenultimate thoracic sternum 

 bears the same tooth as in the typical species, but the penulti- 

 mate is only sharjjïi/ earinated without a tooth and the last is 

 also sharpJi/ earinated in the middle line. 



On the 3rd abdominal tergum the ridge, on either side of the 

 median carina, passes without an interruption into the subtransvcrse 

 ridg(! near the posterior margin, in the typical A. Sibogae both 

 are separated by a groove. 



Length of carapace 11,7 mm., of abdomen 28,3 mm., entire 

 length 40 mm. 



This specimen is for the present considered as a variety, but 

 may, of course, once prove to be a distinct species. 



