598 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.54. 



shape, wider than long (4 mm., 3.1 mm.), its length being slightly- 

 greater than that of the first five segments ; the postlateral margin is 

 evenly rounded. Uropoda 2 mm. long, biramous; peduncle triangu- 

 lar, posterior margin bluntly toothed, with inner postlateral angle 

 acutely produced; outer branch slender, curved, terminating in a 

 bluntly rounded point; the inner branch is about the same length, 

 more oval basally, but also bluntly pointed distally. Pleopoda five 

 pairs, natatory, biramous, outer branch larger, oval, folding over the 

 smaller but similar inner blade. 



The holotype, a single specimen (Cat. No. 50406, U.S.N.M.), was 

 collected in Bahia Honda, Cuba, June 7, 1914, by Dr. Paul Bartsch 

 and Mr. John B. Henderson of the Tomas Barrera Expedition to 

 Northwestern Cuba. (Coll. No. 504.) 



Family SPHAEROMIDAE. 



SPHAEROMA EXOSPHAEROMA, new species. 



Plate 90, figs. 1, 3. 



Body oval, twice as long as wide, 11 mm., 5.5 mm. Head twice as 

 wide as long, anterior margin evenly rounded, posterior margin be- 

 tween the eyes straight, deeply, widely carinated. Eyes very large, 

 round, compound, located in the postlateral angles of the head. The 

 first antennae have the first segment inconspicuous, the second elon- 

 gated, the third not quite as long as the second ; the flagellum, which 

 is broken, retains seven articles and extends midway to the first 

 thoracic segment. The second antennae have the basal article incon- 

 spicuous, the second about 1 mm. long, the third about 1.5 mm., the 

 fourth about 1.75 mm., and the fifth about 2 mm. long ; the flagellum, 

 which is broken, retains 16 articles, the first to ninth inclusive, each 

 bearing on the outer distal margin a stiff brush of setae. The second 

 antennae (broken) extend to midway the first thoracic segment. The 

 maxilliped has a palp of five lobes; the second, third, and fourth of 

 these are more lobed than are previously described Sphaeromas, but 

 this lobing is less pronounced than is found in typical Exosphaero- 

 mas. The second, third, fourth, and fifth lobes of the maxilliped are 

 furnished with brushes of long hairs. 



The thorax has the first segment about 0.5 mm. wider than the 

 rest, with the lateral margin widely expanded anteriorly, curving 

 around the eye to the anterior margin ; posteriorly expanded acutely 

 and produced, overlapping the anterior half of the second thoracic 

 segment; the posterior margin is deeply carinated. The second to 

 fifth segments are subequal, the seventh is nearly as wide as the first 

 segment. The legs are all ambulatory. 



The abdomen is composed of two segments. The first has suture 

 lines indicating the coalescence of several segments. The terminal 



