32 A HISTORY OF RECENT CRUSTACEA 
jas) 
telson. The animal, especially the male, is vermiform. 
The mouth-organs have not been described. Mr. Haswell 
speaks of the outer branch of the uropods as ‘an appen- 
dage which is directly articulated with the posterior border 
of the segment,’ a very strange peculiarity. 
Haliophasma, Haswell, 1880, would seem to be a 
synonym of Anthura, since the species Haliophasma macu- 
lata, Haswell, has been described by Chilton under the name 
Anthura affinis, and stated by him to be a true Anthura. 
Ptilanthura, Harger, 1878, is probably also a synonym 
of Anthura, the one-jointed mandibular ‘ palp’ being due, 
it may be supposed, to a defect of the specimen observed. 
The next two genera agree in having the lower lip 
bipartite but acuminate; the mandibles without teeth, 
lancet-like, lobes at the base forming a channel for the 
liquid drawn by the thrust of the lancets; the first maxille 
spear-like, distally channelled and serrate; the maxillipeds 
elongate, consisting of four or five joints, the second of 
which is elongate. | 
Paranthura, Bate and Westwood, 1866. The flagellum 
of the first antenne in the male forms a large multi- 
articulate brush, in the second it is rudimentary. The 
mandibular ‘palp’ is three-jointed. The pleon has six 
segments and the telson distinct. The outer branch of 
the uropods is short, variable in width. 
Calathira, Norman and Stebbing, 1886. The antenne 
of both pairs in both sexes have many-jointed flagella, 
that of the first pair perhaps not greatly developed in the 
male. The pleon has six segments and the telson dis- 
tinct. The outer branch of the uropods is short and wide, 
overarching. 
Crurégens, Chilton, 1882. Both pairs of antenne are 
short, few-jomted. The second pair have a small exopod. 
‘here is no mandibular ‘ palp,’ but otherwise the mouth- 
organs bear a general resemblance to those of the two 
preceding genera. The seventh segment of the perzon is 
very short and devoid of limbs. ‘The pleon has six seg- 
ments and the telson distinct. The outer branch of the 
uropods is narrow, not overarching the squamiform telson. 
