OF NEW ZEALAND. 91 
Body convex and rounded above, not laterally compressed. The 
seven pair of thoracic legs consisting of an anterior series of three, and 
a posterior series of four pairs. Segments of the abdomen, (the last 
excepted), short, and often more or less coalescent. Abdominal 
appendages of the first five segments foliaceous, and used for respiration, 
of the sixth segment operculiform, lamellate or styliform. Terminal 
segment large, destitute of appendages. 
Sub-Tribe I. IporgrmpeEa. 
Idoteides, M. Edw. (part) Hist: Nat. Crust. ii, p. 121, (1840). 
Idotaeidea, Dana, U.S. Explor. Exped. xiv, Crust. part 11, p. 696, 
(1853). 
Body oblong-oval, oblong, or linear in form. Posterior pair of 
abdominal appendages enlarged, operculiform,, closing over the other 
(branchial) abdominal appendages. 
Family I. IDOTEIDZ. 
Idotaeide, Dana, U.S. Explor. Exped. xiv, Crust. part ui, p. 697, 
(1853). 
Lees all similar, sub-prehensile, or adapted for walking. 
fo) ] ? o 
IDOTEA. 
Idotea, Fabr. (part) Ent. Syst. Suppl. p. 802, (1798). 
Idotea, Latr. Hist. Nat. Crust. et Ins. vi, p. 860, (1803); M. 
Edw. Hist. Nat. Crust. ii, p. 125, (1840). 
Idotaea, Dana, U.S. Explor. Exped. xiv, Crust. part ii, p. 698, 
(1853). 
Body elongated. Head quadrilateral, broader than long. Eyes 
placed laterally. External antenne much longer than the internal, 
and terminating in a multi-articulate flagellum. Maxillipeds very 
large. Seven segments of the body all of nearly’the same shape and 
size. Abdomen with several of the seven segments short, usually more 
or less coalescent, the terminal segment very large, its appendages 
greatly developed, covering the whole inferior surface of the abdomen, 
and closing like doors over the branchial appendages, 
