AMPHIPODA. 253 



Ampelisca brevicoruis (( loSTA, 185:!). 

 A. laevigata, LiLLJEBORG, 1855. 

 For the synonomy of this species, see Norman in 'Ann. and Mag. Nat. Hist.,' 

 Ser. 7, vol. V. (1900).. p. 342. 



Stations XXXIV., XXXV.. ami pearl oyster washings, Muttuvaratu Paar. 

 Length 5 7 millims. 



Ampelisca cyclops, : q. sp. Plate II., figs. 14. 



Galle, 14th February, 1902; Kondatchi Paar, 17th November, 1 !)02. 



Head as long as the Hist :! segments, produced to the end of the 1st joint of the 

 upper antennae, where it is almost cylindrical. At the extreme end are 2 large 

 continent crimson spots in which are placed 1 or 2 (I could only see one, apparently 

 between the 2 red spots) crystalline lens (fig. 14. a). 



The 2nd and 3rd segments of the pleon have a low dorsal carina, and the 1st 

 urus segment a higher one, ending abruptly. The hind margin of the 3rd pleon 

 segment is convex and hollowed out just above the acute posterior angle. 



The upper antennas are placed much in front of the lower and reach nearly to the 

 end of the peduncle of these ; the 1st joint twice as thick and more than half as long 

 as the 2nd ; the 3rd rather shorter than the 1st joint of the flagellum, which is 

 5-jointed and scarcely as long as the peduncle; this, in the adult, has 9 or 10 long 

 plumose setae on the lower side. 



The lower antennae reach to the pleon ; the 1st joint does not reach the end of the 

 1st joint of the upper, though nearly twice as long ; the 2nd joint is nearly twice as 

 long as the 1st, the 3rd a little shorter than the 2nd. 



Palp of the mandibles long and slender, the 1st joint about half as long as the 3rd, 

 the two together about equal to the 2nd. This is not dilated, the 3 joints being sub- 

 equal in width (fig. 14. m.). 



Maxilla? normal, a single setule near the top of the inner lobe of the 1st. 



Maxillipeds with the outer plate reaching the top of the 3rd joint of the palp arid 

 furnished with C disproportionately large oval spine-teeth. 



First and 2nd gnathopods normal ; the side-plates widened below and fringed with 

 plumose seta?. 



First and 2nd perseopods : 5th joint 3 times as long as the 4th, dactylus longer 

 than the two united ; side-plates of the 2nd with the upper posterior angle cut away 

 and slightly hollowed ; front and hind margin parallel. 



Third peraeopods :. 1st joint wide, posterior lobe rather small, projecting ; a long- 

 spine on the distal end of the front margin of the 4th joint. 



Fourth peneopods : 1st joint subquadrate, 4th and 5th joints very spinous on the 

 front margin. Dactylus like a bird's head (fig. 14. pp.'). 



* Prom the apparently single eye. 



