35 



6,5-times as long as broad in the middle, carpus 4,7-times as long as thick at the distal 

 extremity, propodus 7-times as long as broad in the middle. The three movable spinules on 

 the postenor margin of the carpus are present, but that of the distal extremity is lost. Pro- 

 podus with S pairs of spinules, dactylus one-third of the propodus, 5-times as long as broad, 

 ventral claw little shorter than the other. 



The two appendices are implanted on the middle of the inner branch of the 2 nd pleopod •, 

 appendix masculina one-fourth longer than the stylamblys and tipped with 6 long setae, that 

 are nearly as long as the appendix itself, stylamblys with 4 well-developed cincinnuli. 



This rare species, discovered in the Maldive Archipelago, is also known from Rumah- 

 kuda-bay, Roma-island. 



26. Alphctts acuto-femoratus Dana. 



Alpheus acuto-femoratus Dana, J. G. DE Man, Siboga Exp., Monogr. XXXIX a\ Part II, 

 Family Alpheidae, 191 1 (text), p. 337. 



Stat. 115. July 911. East side of Pajunga Island, Kwandang-bay. Reef. 1 young female 

 without eggs. 



This specimen, which after the examination of the 2 Dd pleopod proved to be a temale, 

 is 11,5 mm. long from apex of rostrum to tip of telson and has lost the la'rge cheliped. The 

 rostrum, almost twice as long as broad at its base, extends to the distal third of the visible 

 part of basal antennular article. Antennular peduncle, carpocerite and scaphocerite fully agree 

 with the figure 63 on Plate XXVII of my work of 1902 (Abhandl. d. Senckenb. naturf. Gesells. 

 Bd. XXV). Basicerite with a small spine. Telson 1,48 mm. long, 1 mm. broad anteriorly, while 

 the distance between the postero-lateral angles is 0,45 mm. ; distance between the anterior 

 pair of dorso-lateral spinules and the posterior margin 0,9 mm., distance between the posterior 

 pair and that margin 0,48 mm. Outer surface of merus of small cheliped twice as long as 

 broad, inner margin with a well-developed acute tooth. The acute tooth on the anterior margin 

 of the carpus is placed at the supero-internal angle ; viewed from above the carpus appears 

 one-third longer than broad anteriorly. The small chela is 3,1 mm. long, palm 1,9 min., fingers 

 1,2 mm. and the palm is 1 mm. high, measured on the outer side; according to my descrip- 

 tion of 1902 in the ova-bearing female, long 19 mm., of this species the height of the palm 

 should be two-thirds of its length, so that the palm proves to be less high at a younger age ; 

 the anterior border of the carpus and the inner side of palm and fingers are clothed with 

 long stiff hairs that are not feathered though scabrous, a few similar hairs occur also on 

 the distal extremity of the upper border of the merus, shorter ones on the margins of this 

 joint. Also in the other characters the chela agrees with the description of 1902. 



The carpal segments of the 2 nd pair of legs measure from the i st or proximal one to 

 the 5 th 0,46 mm., 1,32 mm., 0,34 mm., 0,34 mm. and 0,54 mm., the 2 nd segment being 

 almost 3-times as long as the i st ; palm 0,54 mm., just as long as the 5 th segment, fingers 0,42 mm. 



Merus of 3 rd pair 4-times as long as wide in the middle. The merus of the 4 th pair, 

 the apical tooth of which is as large as that of the 3 ld , is 3, 5-times as long as broad in the 



