130 A IIISTOKY OF RECENT CRliSTACEA 



generic name scarcely admits of question, especially when 

 it leads to the possibility of a creature being called 



' Ehalia (Phlyxia) undecimspinosa (Kinahan), var. orhi- 

 mlaris,' a name which is even then incomplete without 

 the addition of the names (Haswell) Miers, to show that 

 Mr. Miers has made Haswell's Phlyxia orbicularis a variety 

 of Kinahan's Ehalia undecimspinosa. 



Ixa, Leach, 1815, has perhaps, according to Mr. Miers, 

 only one species, though five have been named. This one 

 is the Ixa cylindrus (Fabricius), called Ixa 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. 



Oreojjhorus, Riippell, 1830, ' the hill-bearer,' and 

 Spelceophorus., A. Milne-Edwards, ]86(), ' the cave-bearer,' 

 have names referring to the prominences and depressions 

 in the carapace. 



Family 4. — Dorippidoi. 



The afferent channels to the branchias 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 Gyclodorippe, A. Milne-Edwards, being rather doubtful, 

 since in it there are no afferent openiugs to the branchiae 

 in front of the chelipeds. 



Doripp)e, Fabricius, 1798, has a wide range, and in- 

 cludes several species. One of them, Borippe facchino 

 (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 



