THE COPENHAftEX MUSEUM AXD OTHER SOUliCES. 409 



Alloechestes malleolus, u. sp. (Plate 33 A.) 



The body is moderately compressed. The first four pairs of side-plates are rather 

 ■deep, without the projecting point of the hind margin found in many of the Orchestiidae. 

 The third jileon-segment has the postero-latcral angles bluntly produced. 



El/cs. Xot large, rounded, dark in spirit, at least as far apart as their diameter. 



First antenna'. About three-quarters as long as the second pair; the second joint a 

 little shorter than the first ; the third considerably shorter than the second ; the flagellum 

 longer than the peduncle, with ten to twelve joints. 



Second mitennce. Not more than one-third as long as the body ; the peduncle stout ; 

 the last joint a little longer than the penultimate ; the flagellum shorter than the 

 peduncle, consisting of ten to twelve joints. In young from the marsupium the first 

 antennae are not shorter than the second ; the flagellum in each pair is limited to two 

 or three joints. 



First miixiUce. The palp is minute, on a well-defined interruption of the hind margin 

 of the outer plate. 



Second ma.villcc. The princijial seta on tlie inner margin of the inner plate is not 

 very elongate. 



First gnathopods. d . The second joint widens rapidly to the middle ; the fourth is 

 not longer than the third ; the fifth little longer than the sixth, widest subapically, with 

 spines on l)oth margins at the widest part ; the sixtli widening to a sort of palmar angle, 

 a part of the sinuous hind margin being adapted to rest on the hind process of the fifth 

 joint, the margin then abruptly turning to join the short spinulose palm, which is 

 exactly fitted by the stout two-pointed finger. 



Second g/iaihopods. c? . The second joint has no conspicuous distal lobe. The fourth 

 is produced, but not acutely ; the fifth is produced into a shallow, fringed, cup-like 

 process ; the sixth is oval, the finger closing over an oblique, almost straight palm into 

 the usual pocket, armed with two palmar spines ; the hind margin not at all bulging, 

 carrying spinules at two points. 



First gnathopods. ?. The fourth and fifth joints are as in the male; the sixth is 

 oblong, slightly widening to the transverse palm, the hind margin sinuous, the finger 

 acute, closely fitting the palm. 



Second gnathopods. 2 . These are larger than the first pair, though very small 

 compared with the second pair in the male. The fourth joint is subacutely jn'oduced ; 

 the fifth is shorter than the sixth, distally wider than the length, tlie process fringed 

 with spinules ; the sixth joint is oblong, slightly widened distally, the hind margin 

 straight, the finger acute, scarcely reaching the end of the transverse palm. In young, 

 taken from the marsupium, the first and second gnathopods have a general resemblance 

 to the first gnathopods of the adult female. The marsupial plates of the second 

 gnathopods and first pera:;opods have one distal corner subacutely produced ; those of 

 the second perteojiods end squarely ; in all, the fringing setae are short. 



Ferceopods. None are strungly spiued. The finger is curved ; in the last three pairs 

 the second joint is oblong oval, the front margin nearly straight, the hinder produced 



