364 



border with 8 spines and with a long seta inserted near each of them; anterior border with 

 long setae. Accessory claw small, but distinct. 



The male, finally, from Stat. 305 is 11,5 mm. long. Scaphocerite hardly shorter than the 

 antennular peduncle, blade reaching to the middle of 2°^ article. Carpocerite extending beyond 

 the tip of the antennular peduncle by the length of y^ article. Merus of ^^"^ legs 2,24 mm. long, 

 0,52 mm. broad in the middle, only 4,3-times as long as broad; external posterior margin 

 frino-ed with 10 long setae, setae of the internal margin short. Posterior border of the carpus 

 terminating in an acute tooth, without a spinule on the middle, but frinoed with 1 1 long setae. 

 Propodus with 7 spines on the posterior border, without a spine at the far end of the anterior, 

 that is fringed with long setae, while near each of the 7 spines of the posterior a seta is 

 inserted. There is a slight trace of an accessory claw on the dactylus. 



These specimens, though few in number, are very interesting, for they render it pro- 

 bable that A. spongiartwt and A. paraculeipes are varieties of one and the same species. 

 According to Coutiere (Alpheidae Maid, and Laccad. Archip. 1905, p. 894) the merus of s"""* legs 

 should be 5-times as long as broad in A. spongianiin^ but 3,88-times in A. paraculeipes: in 

 the four specimens, which were referred to A. spongiariim because the external posterior margin 

 of the merus is fringed with long setae, the proportion between length and width proved to 

 be 4,5; 4,65; 4 and 4,3. This proportion appears therefore to vary considerably, in no one 

 the merus appears so slender as should be characteristic of this species and in the ova-bearing 

 female it has the same stout form as in A. paraculeipes. Also in regard to other characters one 

 observes some variability, so e. g. in the specimen from Stat. 1 1 5 the propodus of the -^^^ legs 

 carries a spine at the far end of the anterior border, and an accessory claw on the dactylus is 

 usually more or less distinct. 



General distribution: Djibouti (Coutiere); Cheval Paar, Ceylon (Pe.\rson); Torres 

 Strait (Coutiere). 



f 24. Alphetis Etilimene de Man. 



J. G. de Man, in: Tijdschr. d. Ned. Dierk. Vereen. (2) Dl. XI. 1909. p. lOi. 



Stat. 154. August 14. o°7'.2N., i30°2S'.5E. Off North coast of Waigeu Island. 83 m. Grey 

 muddy sand, shells and Lithothamnion.. i specimen. 



A new species of the Crinitus subgroup, closely related to A. styliceps Cout. and to 

 A. Arethusa de Man. 



Rostrum very small, subacute, reaching only to the 2°'^ fifth of the visible part of i^' 

 antennular article, twice as broad at its base as it is long; at either side of the rostrum the 

 frontal margin runs transversely outward and, nearly as in A. snpcrciliaris Cout., is sepa- 

 rated by a distinct emargination from the rounded, orbital hoods. Rostral carina rather sharp 

 and narrow between the orbits, from which it is separated by narrow and shallow grooves ; 

 posterior to the corneae the rostral carina becomes somewhat broader and is prolonged to 

 just behind the middle of the carapace. 



The posterior margin of the pleura of the 1=^' abdominal somite terminates in a spiniform, 



232 



