184 



at the articulation ; the dactylus is sim pi e, without an accessory tooth on the ventral or 

 posterior margin, but there are two minute teeth on the distal half of the anterior, with one 

 or two short setae implanted near each of these teeth. 



Measurements of the fifth legs : merus 1,33; carpus i; propodus 1,6. Merus 13-times, 

 propodus 21-times as long as wide; carpus also very slender, 10,6-times as long as thick at 

 distal extremity. The propodus bears 9 very small spinules along the posterior margin and 2 

 longer ones at the distal end; dactylus 10-times as long as thick near the articulation, measuring 

 almost one-third the length of the propodus. 



Length 16 mm. 



f 4. Alpheopsis ? Euryone de Man. 



J. G. DE Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI, 19 10, p. 308. 



Stat. 129. July 22/23. Anchorage off Kawio- and Kamboling-islands, Karkaralong-group. Reef. 

 1 ova-bearing female. 



It is with some doubt that this species is referred to the genus Alpheopsis Cout., 

 because the legs of the first pair are missing and because the telson shows a quite different 

 form from that of the known species of this genus, resembling the telson of the genus Para- 

 betaeus (H. Coutière, Les Alpheidae. 1899, p. 310, Fig. 390). 



Frontal region as in Alpheopsis acqiialis Cout., but the triangulair, acute rostrum which 

 is slightly convex above and which does not yet reach to the middle of the visible part of 

 first antennular article, appears distinctly wider than long ; as in Alph. aeqitalis the rostrum 

 rejoins at either side the frontal margin by a regular curve, and, like in this species, there is 

 no tracé of extra-corneal teeth, though the frontal margin makes an obtuse angle with the 

 descending, lateral parts of the anterior margin of the carapace. Pterygostomian angle rounded. 

 Upper surface of the carapace finely punctate. Ophthalmopods widely accessible from before. 

 Pleura of sixth abdominal somite triangular, movable, articulate. The telson, which is one and 

 a half as long as the sixth somite, is elongate, 2,91 mm. long and, the posterior margin being 

 0,53 mm. wide, it appears to be 5,5-times as long as this margin is wide; proportion between 

 the width at the base and that of the posterior margin 2,2. Like in the genus Parabetaeus, 

 the telson considerably narrows backward and ends in an acute media n tooth, that 

 measures one-ninth the total length of the telson and that is a little longer than wide at its 

 base, the proportion being as 16:13; this tooth is almost twice as broad at its base as the 

 lateral parts of the posterior margin. These lateral parts make obtuse angles with the lateral 

 borders of the tooth and carry two spinules, the inner longer spinule one and a half as long 

 as the meclian tooth, the outer measuring one-third the length of the inner ; the outer angles 

 of the posterior margin are hardly marked. The lateral margins of the median tooth are 

 fringed with 4 or 5 setae that are even a little longer than the internal spinules of the posterior 

 margin. Spinules of the upper surface small, measuring 1 / 1 . the length of the telson and situated 

 not far from the lateral margins; the anterior pair a little before the middle, the proportion 

 between the length of the telson and the distance of the anterior pair from the end of the 



5 2 



