720 CRUSTACEA. 



duabus monilinis notato. Abdomen semicircidare, segmentis tertio 

 quarto quintoque ad latera obtusis, ultimo ad apicem quadrato, ad 

 basin valde latiore. Appendices caudales subtriangulatai, latitudine 

 breviores, margine interno laid excavato. Antennas fere nudce, flagello 

 vix breviwe quam articidus precedens. 



Head arcuate in front. Segments of thorax transversely marked with 

 a beaded ridge and laterally truncate, anterior segment longest and 

 marked with two beaded ridges. Abdomen semicircular, third, 

 fourth, and fifth segments laterally obtuse, the last with a nearly 

 subquadrate apex and much broader at base. Caudal appendages 

 subtriangular, shorter than breadth at base, inner margin broadly 

 excavate. Antennae nearly naked, flagellum hardly shorter than 

 preceding joint. 



Plate 47, fig. 3 a, animal, enlarged; b, antennas; c, posterior leg; d, 

 extremity of abdomen, under view, showing caudal appendages. 



From under rotten wood, up the Wykare River, near Bay of Islands, 

 New Zealand. Collected by Dr. C. Pickering. 



Length, four lines. Segments of thorax, towards the lateral margin, 

 not in contact; sixth and seventh longer than either of three pre- 

 ceding; their posterior margin nearly straight across the back, but 

 bending backward either side. Width of head about half that of thorax, 

 and its length much less than half its width. The outer side of the 

 triangular caudal appendage is arcuate, the inner deeply concave, 

 with a small cylindrical branch near its centre. The transverse 

 ridge on the thoracic segments is minutely beaded. The legs are 

 short spinulous ; tarsus very slender. The antennas have the fourth 

 joint a little longer than the third, and shorter than the fifth, but 

 hardly longer than the second ; the flagellum is about as long as pre- 

 ceding joint. 



The figure (fig. 3 d) represents the outer branch of the caudal 

 appendages, and not the inner; and as the specimen is not in our 

 collections, the author is doubtful whether the inner are obsolete or 

 not. 



