STALK-EYED CRUSTACEA 449 



the upper and lower margins being laterally compressed 

 and closely implanted. The end of the fixed finger has 

 two cusps with a cleft between, into which fits a broad 

 sharp cusp attached to the movable finger. 

 Range. — Bermuda, Fiji ; in shallow water. 



Division II. Dendrobranchiata. 

 Dendrobrajichiata .... Spence Bate. 

 Gills in the form of branching plumes. 



Group Normalia (Spence Bate). 



The first three pairs of legs, or the second and third, 

 or the third only, may be armed with pincers. The gills 

 may be well developed, few, or wanting. 



Family Penaeidae. 



PenceidcE .... Spence Bate. 



The body is laterally compressed. The carapace is 

 well developed, and is laterally produced so that its 

 posterior lower border is covered by the first abdominal 

 segment. The dorsal median line is keeled. The 

 rostrum is laterally compressed, and may be strengthened 

 on the sides by a longitudinal ridge. There is a longi- 

 tudinal ridge over the branchial region. 



'The segments of the abdomen, especially the first 

 three, are divided into an anterior and aposterior portion 

 by a deep groove ; the posterior portion carries the lateral 

 (coxal) plate. That of the first segment is large and 

 broad ; it overlaps the carapace in front, and that of the 

 second segment posteriorly. The first three segments are 

 never keeled, but the others are. The last segment may 

 have spines and hairs. The eye-stalks are two-jointed. 

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