. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 384 bulletin: museum of comparative zoology. quite broad anteriorly and more slender than the others posteriorly, hut the approximation of the anterior pairs of legs shows this to be due to a contraction of the anterior half of the animal. There is very little A'ariation in length as can be seen from the following measure- ments of all four female specimens. IjCiiKlh Width Legs Type mm. mm. 37 pairs Paratype mm. mm. 36 pairs Paratype mm. mm. 36 pairs Paratype mm. mm. 37 pai
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 384 bulletin: museum of comparative zoology. quite broad anteriorly and more slender than the others posteriorly, hut the approximation of the anterior pairs of legs shows this to be due to a contraction of the anterior half of the animal. There is very little A'ariation in length as can be seen from the following measure- ments of all four female specimens. IjCiiKlh Width Legs Type mm. mm. 37 pairs Paratype mm. mm. 36 pairs Paratype mm. mm. 36 pairs Paratype mm. mm. 37 pairs Legs. The number of pairs of legs varies from 36 to 37 in the female, two having the former and two the latter number. In the male, as shown by two specimens there are 34 pairs. Each leg has five well- de^'eloped creeping pads, the fifth usually considerably narrower than the fourth and occasionally somewhat reduced in length, al- though usually almost as long as the fourth. The first is broader and the three following of about equal width as a rule, although frequently the fourth is dis- tinctly narrower and sometimes scarcely wider than the fifth. The nephridial tubercles of the fourth and fifth pairs of legs (Fig. 1) are nearly included in the third creeping pad which is very deeply emarginate, but not completely di\'ided by them; the fourth pad is distinctly emarginate, but not deeply ex- cavated along its distal edge opposite the tubercle. There are four pedal papillae on each leg, ver>- rarely five in three of the four specimens, while the fourth shows on a considerable number of the anterior legs five well-developed papillae. The fifth papilla is rarely as large as the others, and .sometimes occurs between the pair on the anterior or posterior edge of the foot, or either above or below them. Bouxier lias regarded the presence of extra papillae on certain legs as a specific character, but it is evident at least in the of the. Fit? pliridi 1.— I'erifxitus per
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Keywords: ., bookauthorha, bookcentury1800, bookdecade1860, booksubjectzoology
