422 A HISTORY OF RECENT CRUSTACEA 
second antenne from two- to seven-jointed, the ‘ palp’ of 
the maxillipeds obscurely two- to three-jointed, the 
branches of the uropods subequal or the inner thinner 
and rather shorter than the outer. Trichoniscus pusillus, 
Brandt, is identified with the British Philougria riparia 
(Koch), Trichoniscus vividus, Koch, with the British Phil- 
ougria vivida, and Trichoniscus roseus, Koch, with the 
Philougria rosea, which not only occurs in many parts of 
England and other European countries, but has been taken 
by Mr. Chilton in New Zealand. The first two are little 
agile brown species; the third is especially attractive by 
its delicate rose colour, a tint so unusual in this tribe. 
Budde-Lund describes two other species, and names four 
more, one of the latter being the Scyphacella arenicola, 
S. I. Smith, of the United States. Dollfus describes four 
new species, two being from the Azores, one from Tristan 
da Cunha, and one from Valparaiso. 
Haplophthalmus, Schébl, 1860, has the flagellum of the 
second antennee three-jointed, the legs shorter than in 
T'richoniscus, and the pleon less abruptly narrower than 
the pereeon. The last character it shares with Smith's 
Scyphacella. The two species are Haplophthalmus Mengit 
(Zaddach), and Haplophthalmus danicus, Budde-Lund, 
both of them white. 
Oligoniscus, Dollfus, 1890, is distinguished from T7ri- 
choniscus, because, the head being bent forward, the 
frontal line encroaches on the facial region, and because 
the eyesaresimple. The specific name of the type-species, 
Oligoniscus monocellatus, from Juan Fernandez, corresponds 
inmeaning with Haplophthalmus, the name of the preceding 
genus, from which it seems but little remote. 
Titanethes, Schiddte, 1849, has no eyes, the flagellum 
ot the second antennee multiarticulate, the ‘palp’ of the 
maxillipeds three-jointed, the uropods with conical, stili- 
form, unequal branches. ‘%tanethes albus (Koch) is the 
type. Five other species have been recorded. The genus 
appears to be confined to caverns. 
