A REVIEW OF THE MYSIDACEA 69 



Uropods (fig. 16, b) with the exopod longer than the endopod ; proxi- 

 mal joint of the exopod twice as long as the distal joint, with about 13 

 spines on the outer margin occupying more than half the margin; 

 distal joint of the exopod almost twice as long as broad; endopod 

 with a closely set row of spines on the inner margin extending from 

 the statocyst to the apex, arranged as large spines separated by groups 

 of smaller spines. 



Pleopods of the males with both rami and both the third and fourth 

 pairs with modified setae on the terminal and penultimate joints. In 

 the third pair the terminal joint of the endopod (fig. 15, c) bears 

 two modified setae, a large, blunt simple one and a smaller, more 

 acute plumose one. The exopod of the third pair (fig. 15, d) has a 

 pair of similarly modified setae, both plumose, on the terminal joint. 

 In the fourth pair the endopod (fig. 15, /) has the terminal joint 

 furnished with two modified setae, the longer very closely and finely 

 feathered but much stouter than the normal plumose setae arming 

 the rest of the limb, the shorter stout and simple ; the penultimate joint 

 has one of its plumose setae modified in the same way as the longer 

 of the two setae on the terminal joint ; that is, it is stouter and more 

 closely and finely feathered. The exopod (fig. 15, e) of the fourth 

 pair has the terminal joint armed with one long, stout, simple spini- 

 form seta and a rather short, fine, simple seta; the penultimate joint, 

 in addition to the normal plumose seta at each corner, has a single long, 

 stout, simple seta inserted some little way behind the distal margin 

 on each side. Length of adult specimens of both sexes 10 mm. 



Occurrence. — West Indian region : The Albatross collected mate- 

 rial by electric light at the surface in 1884 at Kingston, Jamaica, about 

 50 specimens ; Monos Island, Trinidad, about 50 specimens ; Key West, 

 Fla., 3 specimens; the Albatross likewise collected two lots at the sur- 

 face in 1886, at San Salvador, 25 specimens; and New Providence 

 Island, 5 specimens. John B. Henderson and Dr. Paul Bartsch, on 

 the Tomas Barrera expedition to Cuba, collected at the following lo- 

 calities : Los Arroyas, station 8, collection numbers 192 and 197, May 

 12-20, 25 males and 6 breeding females; off Santa Lucia, collection 

 number 28, May 12, 1914, 6 breeding females and 9 males; Ensenada 

 Santa Rosa, station 7, collection numbers 184, 185, 1 to 3 fathoms, on 

 sand, shell, weed, and sponge, 40 specimens; Cabanas, station 16, 

 collection 518, on sand, shell, grass, or mud, 2 to 25 fathoms, June 8-9, 

 1 adult female and 1 young; Punta Colorado, station 1C, collection 

 240, 2 to 3 fathoms, from shell and grass, 11 females; Esperanza be- 

 tween anchorage and entrance, collection 396, station 13, 2 fathoms, 

 mud and gravel, 3 males and 6 females; Ensenada de Cajon, off Cape 

 San Antonio, station 11, collection numbers 351-353, May 22-23, 1914, 



