Contributions to the Crustacean Fauna of South Africa. 229 



refrained from dissecting the single specimen at his disposal ; and 

 they cannot be seen until the maxillipeds have been removed. 



Maxillipeds indistinctly 2-jointed, with well-developed epipod. All 

 five pairs of peraeopods are similar, consisting of four stout joints 

 and a curved unguis with 2 setae on its inner margin. 



Marsupial plates, 1st pair elongate, composed of a short outer lobe 

 and a longer inner lobe, almost completely covering the maxillipeds, 

 2nd and 3rd pairs very small, 4th pair larger but not equalling the 

 1st pair, 2nd-4th pairs completely hidden under 1st pair, 5th pair 

 very large, extending to hinder end of body. 



When the marsupial plates are folded back the ventral surface of 

 the body shows a wrinkled (this is perhaps due to preservation) 

 median ridge and four transverse ridges ; the first transverse ridge is 

 just below the opercular plate (sternite) ; at the sides of the third ridge 

 is a pair of 2-jointed appendages, representing the single pair of 

 pleopods. At the extreme end of the body are three raised pads, 

 apparently representing the last three pleon segments. If so, the 

 segment below the opercular plate is the seventh peraeon segment. 



A single specimen of a young female shows a transverse head with 

 which the 1st peraeon segment is fused, and 5 free peraeon segments. 

 The 7th peraeon segment is fused with the abdomen, which is com- 

 posed of a single segment. There are 7 papillae along the medio- 

 ventral line. The rostral cone shows no differentiation into upper 

 and lower lips, and there is no trace of the mandibles. There are 

 7 pairs of peraeopods, each consisting of 5 joints and a curved 

 unguis ; they appear hammer-shaped owing to the 5th joint being 

 very much larger than the small 3rd and 4th joints and being much 

 expanded behind. 



Between the 3rd and 4th (free) segments of the right side a 

 cryptoniscan male was attached. 



The male is similar in shape to that of Z. retrodens, Richardson 

 (Proc. U.S.N.M. vol. 27, 1904, p. 679, fig. 33). On each of the 

 6 free peraeon segments there is a rounded median ventral papilla. 



The oval pleon shows three indistinct furrows. 



Mandibles minute, styliform, with broadened bases. 



Peraeopods 5-jointed, hammer-shaped, first 2 joints large, stout, 

 2nd and 3rd joints small, 5th joint large, transversely oval, with 

 curved unguis. 



The single specimen was found under the right 5th marsupial 

 plate of a female measuring 8 mm. by 4-5 mm. 



Cryptoniscus stage. The peraeon and pleon show the full comple- 

 ment of segments, the postero-lateral angles being acutely produced 



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