148 Bulletin Vanderbilt Marine Museum, Vol. VI 



fingers; toward the tip of the finger these setae become clusters 

 and immediately below each tip is a fan-like cluster composed of 

 more numerous, closer-set bristles. 



The second pair of legs is slender. The merus is 2.5 mm. long; 

 the carpus has the first joint 2 mm. long, the second joint 1.2 mm. 

 long, the third joint 0.9 mm. long, the fourth joint 0.7 mm. long, 

 the fifth joint 1.3 mm. long; the propodus is 1.5 mm. long, the 

 palm being about half of this total ; the fingers are slender, curved, 

 separated by an oval ellipse, the tips meeting ; there are clusters 

 of outstanding bristles on both sides of the upper finger subdistally. 



The ambulatory legs are very slender, similar, decreasing in 

 length in the order 1, 2, 3. The right leg of the first pair measures : 

 ischium, 1 mm. long; merus, 3.5 mm. long, and 0.7 mm. median 

 width, not much expanded at this point; the carpus is 1.8 mm. 

 long; the propodus is 2.5 mm. long, and is 0.5 mm. wide, not 

 tapered throughout the length, armed with ten to twelve articulate 

 spines along the inferior lateral margin ; the dactyl is one-third 

 as long as the propodus, scimitar-like, very tapered, curved, acumi- 

 nate, and has no accessory spines. 



The external maxillipeds are pediform, extending as far for- 

 ward as does the antennal peduncle and have the distal articles 

 multiarticulate, rather fleshy, and tipped distally with a brush of 

 bristly setae. 



Alpheus, new species 



Material examined: An imperfect specimen of an appar- 

 ently new species, taken in coral, Temukus Roads, Bali, Dutch 

 East Indies, October 25, 1931. 



Technical description : Rostrum very conspicuous, long, di- 

 rected upward, with three-fifths of the apex projected beyond the 

 carapace, reaching the distal margin of the third peduncular ar- 

 ticle of the antennulae, narrowly triangulate, with the width at 

 base not quite one-half of the total length, devoid of dorsal carina 

 and not separated from the orbits by sulci; the ventral surface 

 of the rostrum is produced into a conspicuous laminate carina, 

 the ventral margin of which is convex, tapering in both directions. 

 The orbits are not convex dorsally and their respective frontal 

 margins are but little rounded ; the pigmentation areas are sepa- 

 rated from each other by a distance equal to the width of one eye- 

 spot and are also set well back from the frontal margin ; they are 



