298 



A. propensalata, according to the figure 6 of the "Illustrations". The abdominal pleura fully 

 resemble those of A. propensalata ("Illustrations", fig. 6a). 



The i st pair of legs are furnished with a well-developed exopodite. 



The 2 nd legs (Fig. 71/) are short and project only by the fingers beyond the carpal 

 articulation of the hand of the anterior pair; the carpus (1,4 mm.), which is' slender and 7-times 

 as long as thick at its distal extremity, is hardly longer than the chela (1,32 mm.), which 

 is almost 5-times as long as broad (0,28 mm.) near the articulation of the fingers ; the fingers 

 (0,62 mm.) are nearly as long as the palm (0,7 mm.). The 2 nd legs therefore much agree with 

 Bate's figures 2 and 3 (1. c), but in the figures 6 and 6a of the "Illustrations" (1. c), they 

 reach much farther forward, the chela appears longer than the carpus and the fingers shorter 

 in proportion to the palm. 



The 3 rd legs are setaceous and extend by the dactylus and half the propodus beyond 

 the forwardly extended propodus of the i st pair; the dactylus appears half as long as the 

 propodus, which is as long as the merus, whereas the carpus is a little longer. When A. media 

 is indeed identical with A. propensalata (Bate), the 3 rd legs appear in the figures 6 and 6a of 

 the "Illustrations" of a too stout shape and the carpus appears not longer than the merus or 

 propodus; unfortunately in Bate's figure 3 the boundaries between dactylus and propodus like 

 between merus and ischium have not been indicated. 



Geographical distribution of the typical A . propensalata (Bate) : Botany Bay 

 (Whitelegge); Kei-islands (Bate); Andaman Sea (Alcock). 



3. Aegeon Sibogac de Man. (PI. XXIV, Fig. 72 — 72/). 



Aegeon Sibogae J. G. de Man, in: Tijdschr. cl. Neder]. Dierk. Vereen. (2) Dl. XVI, Afl. 2 

 and 3, 1918, p. 302. 



Stat. 15. March 15. 7 2'. 6 S., II5°23'.6E. Bali Sea, south of Kangeang. 100 m. Bottom fine 

 coralsand. 1 female without eggs. 



Aegeon Sibogae belongs to that Section of the genus, in which the hepatic groove is 

 well-defined, and, the abdominal pleura being not truncated inferiorly, appears closely related 

 to A. pennata (Bate) and its variety ajfinis (Alcock). 



Measured in the middle line, the carapace proves to be 13,3 mm. long, the abdomen 

 31,7 mm., entire length 45 mm.; the body, 4,6-times as long as the 2 nd somite is wide, appears 

 comparatively a little wider than the ovigerous female of A. pennata (Bate) from Stat. 306, 

 that has nearly the same size. Rostrum triangular (Fig. 72, 72a, 72/;), reaching to the middle 

 of basal antennular article and to the cornea of the eyestalks; to the naked eye and even 

 when using a feeble magnifying-glass, the apex appears simple and subacute, under the microscope, 

 however, it proves to end in two extremely minute teeth, of which the tips are only 0,06 mm. 

 distant from one another. Like in A. peniiata a conical tocth stands on either side at the base; 

 the length (1,44 mm.) of the line uniting the apices of these two teeth is just one and a half as 

 long as the distance (0,96 mm.) between the tip of the rostrum and that line, measured in the 

 middle ; the two basal teeth are rather large, measuring one-fifth the distance between the tip of 

 the rostrum and the base of these teeth. The carapace which is 13,3 mm. long and 11,5111111. 



