296 
CLASS VIII. 
The phosphoric light which some species diffuse (Scol. electrica phos- 
phorea) is to be ascribed to a fluid that passes upon the skin from open- 
ings similar to those in the Julide (Waga). Numerous observations are 
recorded that myriapods of this division, after having caused lingering 
head-ache, have been sneezed forth by men from the nose (F. TIEDEMANN, 
Von lebenden Wiirmern u. Insekten in den Geruchsorganen des Menschen, 
Mannheim, 1844, 8vo, s. 11—17, to which examples many others may 
be added). To reject the observations, is certainly more easy than to 
explain the continued life of these insects in such an unusual situation. 
Scolopendrella Gery. Antenne with twenty joints, moniliform. 
Ocelli two. Segments of the body sixteen. Mouth not chelate, 
suctorial. Habit of Geophylus. 
Comp. Ann. des Se. nat. troisitme Sér. Zool. Tom. It. p. 79, 8vo, Pl. 5, 
figs. 15, 16. Is this its place? Are the sucking Scolopendre to be com- 
pared with the Siphonizantia chilognatha BRanDt? ! 
Secrion II. Hexapoda. 
Feet six. Thorax separate from the abdomen. 
Orver Il. Thysanura. 
Hexapod, apterous, not undergoing metamorphosis, not para- 
sitic. (Mouth with mandibles and maxille. Two groups of simple 
eyes. Sete or a bifid tail in most at the end of the body). 
Ovoavovpo: from Ovcavos, a fringe, a tuft, and ovpa, thus named 
from some species which have jointed threads at the posterior 
extremity ; in others there is a forked tail which in a state of rest 
is bent forwards beneath the body, and on extension gives a blow to 
the ground, which causes the body to spring upwards: hence they 
may be named spring-tails. In some however the posterior part of 
the body has only two small conical hairs (Podura fimetaria L.) or no 
appendage at all. The body is generally elongate. Some are very 
small, and even the largest species are scarcely half an inch long. 
They love moisture, and live on the ground, under stones, in mould 
or old fallen leaves, under the bark of trees, in dark corners of houses, 
&c. They undergo no metamorphosis, but change their skin often. 
The intestinal canal is straight, the stomach wide. In Lepisma 
there are two, in Smynthurus, according to Vicolet, three vessels for 
secreting urine. The external sexual organs are placed at the 
posterior extremity of the abdomen. In the female of Lepisma a 
split tube or borer is found which serves for depositing the eggs. 
