A history of the British sessile-eyed Crustacea . he progress of his observations he found that others,assimilating to the type in most points, had not thethree hinder pairs of legs so developed : hence, in hisdescription of Macrostyles spinifera, he writes of theseappendages as Eorum structura ad natandum parumapta esse videtur (vide Zoological Record, 1864, p. 295). The family is also described as containing animalshaving no eyes; but we know that subterranean Crustaceaare generally so, as agreeing with their peculiar habits;but even in these, as far as our experience instructs,the organs ar
A history of the British sessile-eyed Crustacea . he progress of his observations he found that others,assimilating to the type in most points, had not thethree hinder pairs of legs so developed : hence, in hisdescription of Macrostyles spinifera, he writes of theseappendages as Eorum structura ad natandum parumapta esse videtur (vide Zoological Record, 1864, p. 295). The family is also described as containing animalshaving no eyes; but we know that subterranean Crustaceaare generally so, as agreeing with their peculiar habits;but even in these, as far as our experience instructs,the organs are preserved, but reduced to a rudimentarycondition. In the nearly-allied genus Munna, the eyesare large, and placed at the extremity of a fixed in the other Asellidce the organs are less prominent;and in all other respects we see nothing that can induceus, with the information that we possess, to separatethis genus (and we believe also the Isopoda Remagantia)from the Asellidte, ISOPODA. N0R3IALIA. LEPTASPIDIA BREVIPES. 333 ^ LEPTASPIDIA BREVIPES. Specific character. Cephalon large, semicircular, -with a slight depressionin the middle of the anterior margin, its posterior lateral angles segment of the pereion with the fore margin emarginate, for the receptionof the hind part of the head; lateral margins of the segments of the bodyentire, rounded, and ciliated. Length, one-twentieth of an inch. We are only acquainted with a single individual of thesingle species upon which we have established this genus,the specific characters of which cannot consequently atpresent be distinguished from the generic ones, and as ourspecimen was sent to us mounted for the microscope, wehave not had sufficient opportunity of observation toallow us to detail the precise structure of the severalparts. The antennae are implanted on the under surface * r fCx VM- tC^ ^...^ ^^ p *^j-^ 334 ASELLID^. of the cephalon considerably within the margin. Theanterior pair we ta
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Keywords: ., bookauthor, bookcentury1800, bookdecade1860, booksubjectcrustacea
