/ 



300 



mm. long and 2,3 mm. broad, so that in the latter the propodus is only three-, in 

 A. pennata four-times as long as broad. Like the propodus, also the dactylus has a less 

 slender form. A sharp spine occurs at the far end of the outer margin of the merus. 



The 2 nd peraeopods (Fig. 72/) are longer than those of A. pennata and show also 

 different measurements. These legs project by the chela and half the carpus beyond 

 the carpal articulation of the chela of the i st pair; the carpus (4,5 mm.) is a little more 

 than one and a half as long as the chela (2,75 mm.) and the fingers that are a 

 little gaping, are nearly half as long as the palm, the chela, finally, is a little slender er, 

 6-times as long as broad. 



The setaceous peraeopods of the 3" 1 pair reach with the dactylus beyond the propodus 

 of the anterior legs, the relative measurements of the joints are the same as those of pennata, 

 but they are a little less slender. The two posterior legs present no differences. 



4. Aegeon Sibogae, var. intermedia de Man. PI. XXIV, Fig. 73, 73a. 



Aegeon Sibogae var. intermedia J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereeniging, (2) 

 Dl. XVI, Afl. 2 and 3, 1918, p. 303. 



Stat. 302. Febr. 2. 1900. 10° 27'. 9 S., I23°28'.7E. Strait between the islands of Rotti and 

 Timor. 216 m. Bottom sand and coral sand. 1 female without eggs. 



The carapace of this female is 11,7 mm. long, the abdomen 28,3 mm., entire length 

 40 mm. 5 the body appears nearly 5-times as long as the 2 nd somite is wide. The rostrum is 

 a little less broad at base in proportion to its length than in the typical specimen from Stat. 1 5 

 and the apex is obtuse. though perhaps damaged. Carapace like in the type, but the huge, 

 wing-like spine at the anterior end of the lateral crest is much more turned ontward, 

 as much as in A. pennata and a line uniting the apices runs along the middle of 2 nd antennular 

 article ; the serration of the supra-marginal carina is rather obtuse, though the 13 or 14 

 prominences are still perceptible. 



The antepenultimate thoracic sternum (Fig. 73) is armed in the middle line with the 

 same, acute, compressed tooth as in the type ; the penultimate and the posterior sterna are, 

 however, both sharply carinated, but the dentiform dis tal extremities of these 

 two carinae do not project upward. 



The abdomen agrees with the typical species except the 3 ld tergum. From the anterior 

 extremity of the median crest (Fig. 73 d) an oblique carina runs backward on either side of it 

 and this carina curves without i n t e r r u p t i o n into the subtransverse crest near the 

 posterior margin: in the typical A. Sibogae, however, the oblique carina is separated by an 

 interruption from the subtransverse crest. 



The peraeopods agree with the typical form, the i st pair bears also a short, setose 

 exopodite, but the carpus of the 2 nd pair is hardly one and a half as long as the chela. 



5. Aegeon Rathbuni de Man. PI. XXIV and XXV, Fig. 74—74^. 



Egeon orientalis M. J. Rathbun, in: U.S. Fish Commission Bulletin for 1903, Part III, Wash. 

 1906, p. 911, PI. XXIII, fig. 3 (nee Aegeon orientalis Henderson). 



