than 1 / i of the propodus, o, i mm. broad at base. Relative measurements: merus 1,64, carpus 1, 

 propodus 1,9; propodus 1,16-times longer than the merus, tooth of the merus as in the type. 



Merus of the 5 th pair 0,92 mm. long, 0,232 mm. broad in the middle, proportion 4; 

 carpus 0,62 mm. long, 0,186 mm. thick at the distal extremity, proportion 3,3; propodus 

 1,2 mm., 0,15 mm. broad in the middle, proportion 8. Dactylus 0,34 mm. long, a little more 

 than 1 / i of the propodus, 0,09 mm. broad at base. Relative measurements: merus 1,5, carpus 1, 

 propodus 2. Propodus 1,3-times as long as the merus. 



Of the female only the leg of the y d pair could be measured. Merus 1,2 mm. long, 

 0,28 mm. broad in the middle, proportion 4,3; carpus 0,68 mm. long, 0,22 mm. thick at the 

 distal extremity, proportion 3,1; propodus 1,2 mm. long, 0,18 mm. wide in the middle, pro- 

 portion 6,6, propodus with 11 or 12 spinules besides the two at the distal extremity. Dactylus 

 0,33 mm. long, a little more than 1 / i of the propodus, 0,1 mm. broad at base. Relative mea- 

 surements: merus 1,8, carpus 1, propodus 1,8. Merus and propodus of equal length. 



These measurements show also that in the peraeopods of the 3 rd and 4 th pair the merus 

 appears a little shorter in proportion to the carpus than in the type. The 2 nd pleopod of 

 the male shows the following measurements. Exopodite 0,62 mm. long, 3-times as long as 

 broad; endopodite of the same length but a little less broad, appendix interna 0,22 mm. long, 

 5-times as long as thick, with distinct cincinnuli; appendix masculina a little shorter, furnished 

 with 6 or 7 long setae on the tip and 6-times as long as thick. 



Ova 0,52 mm. long, a little less broad. 



General distribution : Off Siau-island (de Man), off the coast of Obi Major (de Man). 



17. Alphcopsis sp. PI. III, Fig. 12— 12 c. 



Stat. 166. August 22. 2°28'.5S. i3i°3'.3S. Midway between Ceram and New Guinea. uSni. 

 Bottom hard, coarse sand. 1 specimen. 



This specimen, which is no doubt still very young, should probably be referred to 

 Alphcopsis trispinosa (Stimps.), but I hesitate to do so, because it does not fully agree with 

 the figures of this species published by Professor Coutière in his great work "Les Alpheidae" 

 (Annal. des Scienc. Nat. 8 e Série. Zool. T. IX, 1899) — though these differences may once 

 prove to be owing to its young age. Alphcopsis trispinosa (Stimps.) occurs in Port Jackson, 

 but should, according to Coutière, be also found on the west coast of Africa ! 



This specimen is only 8,2 mm. long from the apex of the rostrum to tip of telson, the 

 carapace being 2,4 mm. long, the abdomen 5,8 mm. The slender acuminate rostrum (Fig. 1 2) reaches 

 to the distal extremity of basal antennular article and is 0,33 mm. long, i. e. one-sixth the rest 

 of the carapace. Extra-corneal spine also acute, half as long as the rostrum, with the tips slightly 

 curved inward. The lateral margins of the rostrum pass with a regular curve into the anterior 

 margin of the carapace, and one observes hardly a tracé of an angle between the inner margin 

 of the extra-corneal spines and the anterior border of the carapace. In Coutière's figure 26 

 at p. 74 of the quoted work the three spines of the anterior border of the carapace show a 

 different stouter shape and they make distinct angles with that border. In a lateral 



