PARASITIC CRUSTACEA FROM BIMINI — PEARSE 361 



tenna, in the shape of the cephalothorax, second antennae, and 

 maxillipeds, in the smaller body, in the well differentiated first and 

 second thoracic segments. It also resembles somewhat H. parva, 

 described in this paper, but it differs from that species in the shape 

 of the cephalothorax, in the shape of the posterior end, in the 

 extent to v/hich the first and second legs protrude laterally, in the 

 com.parative width of the cephalothorax and the rest of the body, 

 in having smaller second antennae, and in the more anterior 

 position of the mouth tube. It differs from H. harkema Pearse in 

 the shape of the head, in the position and armature of the second 

 antennae, leg?., and caudal rami. The shape of the head and body 

 are somewhat like those of H. longibrachium Yamaguti (1939), 

 but the first antennae, caudal rami, and legs differ in their setation. 

 The species is named exigua because of its small size. 



HATSCREKIA AMPLICAPA, new species 



Figure 74, n-t 



Female. — Carapace wider than long, rounded in front, indented 

 behind, a little wider than remainder of body. No neck, sides of 

 body nearly parallel and posterior almost as wide as anterior. 

 Posterior end truncate with caudal rami little longer than wide 

 and armed with four setae. The legs are visible at the sides of 

 the thorax. 



First antenna 3-segmented, rather stout; basal segment with 

 two minute spines, second with two setae ; third with four terminal 

 setae. Second antenna large, terminal hook with large base, 

 slender acute tip, and no accessory spines. Mouth tube rather far 

 forward, wider at the anterior end. First maxilla a simple spine 

 with a bilobed base. Maxilliped slender, with double terminal 

 hooks. 



First leg biramous; exopod 2-segmented, terminal segment 

 tipped with three short spines ; endopod 2-segmented with a long 

 and a short terminal spine ; a small seta is present medial to the 

 endopod. Second leg biramous ; first segment of exopod with ter- 

 minal spine, terminal segment with a long and a short seta ; endo- 

 pod 2-segmented, terminal segment broad and armed with three 

 very minute spines. One eg^ string contains 16 large eggs. 



Measurements: Length 1.0-1.3 mm.; width of carapace 0.26 

 mm. ; width of body 0.24 mm. 



Male. — Unknown. 



Ti/pe.— U.S.N.M. No. 88602. 



Host. — Eight females were taken from the gills of the great 

 barracuda, Sphyraena barracuda (Shaw). 



