NO. 1G59. A.UERIC.W SPECIfJS OF t<y \ ALl' UtWS—COUTIERE. 



49 



the anteiinules especially, luaikedly slender, being times longer than 

 wide, as in the male; in the largest females of /S'. minii.s^ which are of 

 equal size, this proportion never exceeds 5; the carpocerite is only 

 3.3;") times longer than wide instead of 3.7 times, as in the largest 

 female of S. iii'niiis. 



This specimen presents, moreover, a very peculiar form of rostrum, 

 the point being shorter, and, particularly, much narrower than the 

 lateral teeth. I have noticed in a male a tendency toward this shape. 

 The lateral spines are very slightly longer than the rostrum, forming 



Fig. 28. — Synalpheus digueti and S. digueti ecuadorensis. a, frontal and antennal 



REGION OP S. DIGUETI, MALE OF MEDIUM SIZE ; a' , FRONTAL AND ANTENNAL REGION OF S. 

 DIGUETI, FEMALE OF MEDIUM SIZE ; a", FRONTAL AND ANTENNAL REGION OF S. DIGUETI, FE- 

 MALE OF LARGE size; aO, FRONTAL AND ANTENNAL REGION OF S. DIGUETI ECUADORENSIS, 

 MALE ; C, CARPOCERITE OF S. DIGUETI, MALE ; & , CARPOCERITE OF S. DIGUETI, FEMALE ; CC, 

 CARPOCERITE OF S. DIGUETI ECUADORENSIS ; k' . SMALL CHELIPED OF FIRST PAIR OF S. 

 DIGUETI ; m, MEROPODITE OF THIRD PAIR OF S. DIGUETI. 



a i:)rominence exceeding it in height, so that the rostrum seems to be 

 situated on a lower plane. 



The eggs are of the same size as those of S. minus and also give rise 

 to zoea^. 



Twelve specimens, male and female, from Lower California (M. 

 Diguet, Paris Museum). 



One very interesting form of this s])ecies is represented by two speci- 

 mens, male and female, from Ecuador, The diiferences between the 

 Proc. N. M. vol. xxxvi— on 4 



