422 A HISTORY OF RECENT CRUSTACEA 



second antennge from two- to seven-jointed, the ' palp ' of 

 the maxillipeds obscurely two- to three-jointed, the 

 branches of the uropods snbeqnal or the inner thinner 

 and rather shorter than the outer. Trichoniscus 'pusillus^ 

 Brandt, is identified with the British Philougria riparia 

 (Koch), Trichoniscus vividiis, Koch, with the British Phil- 

 oijgria vivida, and Trichoniscus roseus, Koch, with the 

 F/iilo'ugria 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 Sci/phacella arenicolct, 

 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. 



Ilaplophthalmns, Schobl, 1 860, has the flagellum of the 

 second antennae three-jointed, the legs shorter than in 

 Trichoniscus, and the pleon less abruptly narrower than 

 the peraeon. The last character it shares with Smith's 

 Scifphacella. The two species are Haplophthahniis Mengii 

 (Zaddach), and HaplopJithalmus danicus, Budde-Lund, 

 both of them white. 



OUgo7usciis, Dollfus, 1890, is distinguished from Tri- 

 choniscus, because, the head being bent forward, the 

 frontal line encroaches on the facial region, and because 

 the eyes are simple. The specific name of the type-species, 

 Oligoniscus monocellatus, from Juan Fernandez, corresponds 

 in meaning with Haplophthahims, the name of the preceding 

 genus, from which it seems but little remote. 



Titcmethes, Schiodte, 1849, has no eyes, the "flagellum 

 ot the second antennae mulfciarticulate, the ' palp ' of the 

 maxillipeds three-jointed, the uropods with conical, stili- 

 form, unequal branches. TitcmetJies alhus (Koch) is the 

 type. Five other species have been recorded. The genus 

 appears to be confined to caverns. 



