NO. 1659. AMERICAN SPECIES OF 8YNALPIIEU8—C0UTIERE. 



25 



pi-evionsly cited, but in a different direction. T"^p to the present time, 

 in fact, 1 know of no form which is exactly the same in both regions, 



>S'. jxdilsono'idi'H is from the ishmd of San Jose, Lower California 

 (M. Dioiiet, Paris Museum). 



On the South American coasts the species with short carpocerite 

 of the Paulsoni jjroup are similarly represented. The species S. 

 httastei Coutiere, described below, is of great interest. It possesses 

 in Brazil a " temihpina "' form which is wnth difficulty separable 

 from some specimens from Cape Lopez, in West Africa. On the 

 other hand, it exists in Australia, for I can not differentiate from the 

 typical Chilean specimens the unique Australian individual which I 

 have examined. In Australia, moreover, a species with very large 

 eggs, S. maccullocM^ is shown to be 

 closely allied, and 8. jjavlsoni kur- 

 racheensis, previously cited, clearly re- 

 sembles it also, though its appendages 

 are a little more massive. 



SYNALPHEUS LATASTEI, new species. 



The rostrum is longer than the fron- 

 tal spines, and also w^ider; the antennu- 

 lar articles are short and approximately 

 equal; the proportion of the antennule 

 is only 1 : 3.85, the diminution in length 

 affecting especially the basal article; 

 the stylocerite is shorter than in S. lock- 

 ingtoni; the lateral spine of the basi- 

 cerite is as long as the stylocerite; its superior spine is short and 

 strong. 



The antennal scale, rather reduced, is 5.7 times as long as wide, and 

 its long and strong lateral spine exceeds the antennule by the length 

 of the distal article, and usually slightly exceeds the carpocerite, which 

 arises from the same level as the median antennular article ; the pro- 

 portion of its dimensions is 1:2.71, sometimes even 2.()G; its form is 

 more cylindrical than in S. locki)i<jtoni. 



The large chela, which recalls the preceding species by the absence 

 of any spinous prominence on the anterior margin of the palm, differs 

 from it by its more stocky form: Fingers 1; total length 3.4; height 

 1.5. The small chela has the same proportions as in S. loclAngtoni; 

 the meropodites of the two chelipeds terminate on the superior mar- 

 gin in a spinous prominence. 



In the second pair, the first article of the carpus, the four following 

 and the chela are to one another as 1.2, 1.25, 1. The proportions of 

 the third pair are: Mero])odite 2; carpus 1; propodite 1.6; the me- 

 ropodite is 3.12 times longer than wide, and conse(iuently very stout. 



Fig. 6. — Svnalpheus padlson- 



Ol'DES. a, FRONTAL AND ANTEN- 

 NAL REGION ; C, CARPOCERITE ; m, 

 MEROPODITB OF THIRD FOOT. 



