310 



from under the frontal margin and armed each with a stroug, 

 acute and compressed tooth. 



Pleura of 6th somite uot articulate. Telson 4,5 times as long 

 as the posterior margin is wide, the latter as in Bet. aequimanus, 

 but the spiuules of upper aurface uearer to the lateral margius. 



Antenna! regiou about as in Bet. aequimanus. Second antennular 

 article hardly more than half as long as the Ist., 3rd almost 

 one and a half as long as 2nd ; stylocerite reaching to apex of 

 median article. Carpocerite a little longer than antennular peduncle, 

 scale reaching to the middle of 3rd article. 



Meropodite of left chelipede of female unarmed, 3,2 times as 

 long as broad; chela one and a half as long as the meropodite, 

 3,3 times as long as high and 2,75 times as long as the fingers. 

 Fingers shutting close together, the dactylus situated inferiorly. 

 Second legs as in Bet. aequimanus, but the Ist carpal segment, 

 that is 4 times as long as thick, a little longer than the sum of 

 the three middle segments that are equal ; chela twice as long as 

 5th segment. 



Three posterior legs as in aequimanus, the meropodite armed 

 with a raovable spine near the base and the dactyli biunguiculate, 

 but the propodite more slender, that of 3rd legs 8,4 times as 

 long as broad in the middle. 



Ova 1,05 — 1,1 mm. long. Leugth of ova-bearing female 20 mm. 



Aretopsis, nov. gen. 



A new genus of Alpheidae, closely related to Arete Stimps. 

 Looked at from above, the short rostrum appears acute, trian- 

 gular, carinate, without any tracé of supra-corneal teeth ; in a 

 lateral view it appears strongly compressed, witb rounded tip, 

 as in the genus Athanopsis. Extra-corneal teeth wantiug, infra- 

 corneal teeth (= outer angles of the orbits) acute, dentiform. 

 Eyes as in Arete, Pterygostomian angle rounded. Pleura of 6th 

 abdominal somite articulate, movable. 



Antennal region as in Arete, but stylocerite shorter. Ouly one 

 chelipede is knowu, it resembles the smaller of Arete. Meropodite 



