130 A HISTORY OF RECENT CRUSTACEA 
generic name scarcely admits of question, especially when 
it leads to the possibility of a creature being called 
‘ Kbalia (Phlyxia) undecimspinosa (Kinahan), var. orbi- 
cularis, a name which is even then incomplete without 
the addition of the names (Hasweil) Miers, to show that 
Mr. Miers has made Haswell’s Phlyzxia orbicularis a variety 
of Kinahan’s EHbalia undecimspinosa. 
Iza, Leach, 1815, has perhaps, according to Mr. Miers, 
only one species, though five have been named. This one 
is the Ixa cylindrus (Fabricius), called Iva canaliculata by 
Leach. It is widely distributed in the Indo-Pacific region, 
and has a very remarkably shaped carapace, transversely 
rhomboidal or somewhat elliptical, and prolonged at either 
side into a cylindrical lobe, which is often as long as the 
width of the main portion of the carapace. 
Oreophirus, Riippell, 1830, ‘the hill-bearer,’ and 
Speleeophorus, A. Milne-Edwards, 1866, ‘ the cave-bearer,’ 
have names referring to the prominences and depressions 
in the carapace. 
Fumily 4,—Dorippide. 
The afferent channels to the branchiz open behind the 
pterygostomian regions, and in front of the chelipeds. 
The three terminal joints of the third maxillipeds are not 
concealed by the fourth joint. The last pair or last two 
pairs of legs are short and feeble, and raised on the dorsal 
surface of the carapace. The verges of the male are ex- 
serted from the sternal plastron. 
The family includes eight or nine genera, the position 
of Cyclodorippe, A. Milne-Edwards, being rather doubtful, 
since in it there are no afferent openings to the branchiz 
in front of the chelipeds. 
Dorippe, Fabricius, 1798, has a wide range, and in- 
cludes several species. One of them, Dorippe faechino 
(Herbst), is found both in the Mediterranean and at Hong 
Kong. ‘The first two pairs of walking-legs are long, and 
enable the creature to run fast. The two following pairs 
are very slender and short. To account for their dorsal 
position various reasons have been suggested. Herbst 
