26 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXVl. 



The telson has the same form as in S. locl'ingtonL This species 

 seems to be frequent in Chile, from which locality I have been able to 

 examine some ten specimens, thanks to M. Lataste, of the Paris 

 Museum, after whom the species is named; the species is also met 

 with in Australia (?) (one male of great length without indication 

 of locality other than New Holland; Paris Museum). 



The size is greater than in S. loeJHngfoni. It reaches 30.5 mm, in 

 •longth from the rostrum to the telson. 



I have been obliged to separate from the typical species, under the 

 name S. lafastei fenuisphia, a large female from Desterro which dif- 



FlG. 7. SYNALPHEUS LATASTEI. fl, FRONTAL AND ANTENNAL REGION, MALE, AUSTRALIA ; 



a', FRONTAL AND ANTENNAL REGION, FEMALE, CHILE ; C, CARPOCERITE ; K, LARGE CHELA; 

 k', SMALL CHELIPED OF FIRST PAIR; 1, FOOT OF SECOND PAIR; m, FOOT OF THIRD PAIR. 



fers from it in the following points : The antennule is less thick (four 

 times as long as wide instead of 8.85) ; the scale of the scaphocerite 

 equals the antennule, and its very sharp lateral spine exceeds the 

 carpocerite very considerably, the latter being 3 times, or even 3,04 

 times, longer than wide. The meropodite of the third pair is 3.3 times 

 as long as wide, instead of 3.1 times, as in S. latastei. 



This form approaches closely to 8. locMngtoni from California and 

 Lower California, differing from it, however, by the large and more 

 massive chela (proportions T. L. : H. = 2.5; 1 instead of 2,9:1), the 



