152 Schibdte's Specimen 



both are dense and finely ciliated, but without scattered spines ; 

 the lobe has at its apex a minute, sharp, and slightly hairy ap- 

 pendage, and a delicate spine. The outermost joint or claw of the 

 tlioracic legs, wants the little appendage on the inner side, near 

 the apex ; but it is divided into two joints, of which the upper- 

 most is densely bristly and furnished outwardly with a peculiar 

 little apparatus, consisting of two threads, united at the base in 

 a common sheath, but flabelliform and incised at the end. 



The want of eyes, in addition to the above peculiarities, must 

 assuredly be considered as differences from the known genera of 

 the group, far more significant than the characters, which separate 

 those genera among themselves. I hesitate not, therefore, to re- 

 gard the animal as a well-founded genus, The peculiarity in the 

 structure will be understood without difficulty. Having a much 

 more humid locality than Oniscus, Porcellio and the other Oniscidce, 

 and compelled to seek for nourishment in the dark, we easily 

 comprehend the intention of its general slenderness of shape, the 

 more free abdomen, and the longer legs, especially developed be- 

 hind, as adapting it for a higher degree of mobility. The flagellum 

 of the antennae approaches accordingly nearer to the structure, 

 which we find among the Ligice and the other groups of aquatic 

 animals ; while the fanshaped, very flexible apparatus appended 

 to its feet, appears well suited to support its progress on the most 

 frequently perpendicular and wet sides of the caves and the sta- 

 lactites. 



Among the characters in the diagnosis, the first two are suffi- 

 cient to separate the genus from the earlier ones of the group; 

 but some of the others may have to be removed in case other 

 species should be discovered. When it will be seen whether or 

 not the genus occupies the same position in the group, with regard 

 to the difference among its species, as the other genera, whose 

 species, like what occurs in all terrestrial Articulata, are so closely 

 allied to each other, that they differ only in colour, painting, 

 covering, sculpture, and single little inequalities in their forms. 



As the name applied by Koch has been repeatedly used before, 

 even in the same class of animals, I propose a new generic name. 



TlTANETHES. 



Ordo Isopoda — Familia Onisci — Tribus Oniscini. 



Oculi nulli. Flagellum antenna rum exteriorum setaceum, mul- 



tiarticulatum. Mandibulce appendicibus quatuor, anteriori 



nuda, dentata, posterioribus cequalibus, jiliformibus. Mala 



interior maxillarum prions parts appendicibus munita tribus, 



