No. 9.—HABITS AND STRUCTURE OF SCUTIGERELLA 
IMMACULA TA (NEWPORT). 
BY S. R. WILLIAMS. 
Contents. 
PAGE. PAGE. 
Introduction.461 General anatomical relations . 472 
Historical review. 462 Musculature.474 
Distribution. 465 Ecdysis.475 
Surrounding fauna .... 466 Locomotion.476 
Light and water relations . . 467 Eggs and larvae.477 
Experimental evidence con- Summary and conclusions . 483 
cerning food.469 
LIBRARY 
NEW YORK 
BOTANICAL 
GARDEN. 
Introduction. 
The present age is the age of insects. No other animals so abound, 
few have such intimate relationship for good or evil with mankind. 
Since the group is of such importance, those naturalists who have 
investigated the origin and ancestral history of the Hexapoda have 
become interested in the Symphyla, that group of arthropods which 
seems to partake to a certain extent of the characters of the mille¬ 
pedes, the centipedes, and the thysanuran division of the insects. To 
quote from Packard (’73): “It [Scolopendrella or the Symphyla] may 
be regarded as a connecting link between the Thysanura and Myria- 
poda and shows the intimate relation of the myriapods and the hexa¬ 
pods, perhaps not sufficiently appreciated by many zoologists.” Again 
Packard (’98, p. 24) says: “The embryology [of the Symphyla] is 
entirely unknown and it need not be said that a knowledge of it is a 
very great desideratum.” 
Any points which can be added to those already known of the life 
history of the Symphyla seem therefore well worth while and it is the 
purpose of this paper to give the results of a study of one of the Sym¬ 
phyla, Scutigerellci immaculata, and especially the observations con¬ 
cerning its eggs and newly hatched larval form. 
