470 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Plate IV. 

 Adult male aBd temcile of Alpheus saulcyi, viir. brevicarpus, from Nassau, New Providence. 



Fig. 1. Lateral view of female from green sponge. x3J. 



Fig. 2. Dorsal view of the same. x3J. Parts only of tbe ovaries are visible in Fig. 2, while the 

 eggs, which greatly distend the abdomen laterally, show plainly between the bases of 

 the swimmerets. In Fig. 1 the small chela is bent downward, the position in which 

 it is usually carried. In Fig. 2 the chelie are represented in the attitude of defense. 

 The dactyle of the left " hand," or large chela, is raised preparatory to striking. 



Fig. 3. Small male. L = If i"- X 7i. Drawn under slight pressure, owing to which the antennal 

 spines and the antennular exopodites have assumed an unnatural position. The pos- 

 terior margin of the carapace is more correctly represented in Fig. 1. 



