3i4 



as long as the posterior margin is wide. Merus of 3 vd legs 



5-times as long as wide in the middle ........ Dauae Cout. 



(H. COUTIÈRE, Alpheidae Mald. and Laccad. Archip. 1905, p. 8S7, PI. LXXVII, 

 fig. 26). 



b a Dactyli of 3 rd and 4 th legs with a small accessory tooth on the posterior 

 margin. Second antennular article 2, 5-times as long as thick. Ter- 

 minal spine of scaphocerite as long as carpocerite, a little shorter 

 than antennular peduncle. Telson 4,375-times as long as the posterior 

 margin is wide. Merus of 3 ld legs 4-times as long as wide in the 



middle, apical tooth rather small Alpheus sp. 



a„ Merus of 3 ld legs unarmed, 3,6-times as long as wide in the middle. 

 Larger chela 5, 5-times as long as high. Second carpal article of 



2 nd legs only a little longer than i st baculifer Cout. 



(H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 190S, p. 16). 



Crinitus subgroup. 



a, Merus of 3 rd legs with an acute tooth at the apex of posterior margin. 

 ö l Dactyli of three posterior legs biunguiculate. 



c\ Scale of scaphocerite extending at least to the extremity of 2 nd 



antennular article. 



d l Basicerite unarmed, posterior margin of 6 th abdominal somite 



devoid of spines in the middle. 



e, Internal posterior margin of merus of 3 ld legs armed with 



several movable spinules. Fingers of smaller chela shorter 



than the palm. Second legs slender, 2 nd carpal article more 



than 3-times as long as i st Alcyone de Man 



c Internal posterior margin of merus of 3 rd legs unarmed, glabrous. 

 Fingers of smaller chela shorter than the palm. Second 



legs slender, 2 nd carpal article 1,95-times as long as i st . Providencei Cout. 

 (H. COUTIÈRE, in: Buil. Soc. Philom. Paris, 1908, p. 18). 



d„ Basicerite unarmed, posterior margin of 6 th abdominal somite 

 with an acute, median tooth in the middle. 

 Fingers of smaller chela longer than the palm. Second legs stout, 



2 nd carpal article about one and a half as long as i st . . . Arethusa de Man 

 d % Basicerite with a short, though distinct spine at the lower side. 

 Posterior margin of 6 lh abdominal somite with two small spines 

 in the middle. 

 Fingers of smaller chela just as long as the palm. Second legs 

 slender, 2 nd carpal article 2,43 — 2,46-times as long as the i st . 

 Internal posterior margin of merus of 3 rd legs without spinules. paralcyonc Cout. 



1S2 



