MYRIOPODA. 
8 Myr. 
supposed tracheal arches. Menge is mistaken in thinking that the pos- 
terior tracheal arches are continuous, as Ryder finds that they are broken 
at the dorsal vessel. He finds four Malphigiau tubercles in S. immaculata, 
but there are but two in S. notacantha. The number of legs, and of joints 
of the antennae, appears to be variable. Dissimilar as are Lepisma, Machilis, 
Lepismina^ Nicoletia, Campodea, and lapyx^ their principal characters 
forcibly suggest an affiliation with Scolopendrella. S. notacantha is 
figured (p. 85, fig. 2) ; and S. gratia (only indicated in Am. Nat. xiv. 
p. 375, 1880) is described and figured, 1. c. fig. 1. 
Scolopendrella microcilpa, sp. n., Muhr, Zool. Anz. iv. pp. 59-61, figs. 1, 
2 & 4, Prague (figs. 3 & 5 represent details of S. notacantha^ Gerv., figured 
for comparison). 
Malacopoda. 
Eunst, a. Some remarks on Peripatus edwardsii^ Blanch. Nature, 
xxiii. pp. 446-448, woodcuts. 
Important observations on structure, reproduction, &c. The sexes are 
certainly separate. 
Peripatus edwardsi is the only species showing any traces of segmenta- 
tion, and Schmarda, in characterizing the group as possessing thirteen to 
thirty-six segments, probably intended that each pair of legs indicated a 
segment: Pascoe, P. E, Soc. 1881, p. ii. 
