464 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
the addition of new segments “therefore takes place in this animal 
by the intercalation of two at each moult between the antepenultimate 
and penultimate sterna as in the Chilognatha and as also in some of 
the Chilopoda.” 
Haase (’ 83 ) corroborated the statements of Menge in regard to the 
tracheae and demonstrated two stigmata on the head. He corrected 
Ryder and Wood-Mason, who had interpreted as tracheae the endo- 
skeletal bars of each segment. 
Latzel ( 84 ) gives a most valuable description of the external anatomy. 
In repeating the description of the order Symphyla given by Ryder 
(’ 80 ), he says (p. 1): “Orificium genitale in segmente ultimo corporis 
sit urn.” In the body of the text, however (p. 5), he speaks of the pore 
“den Mann bei grosser Anstrengung auf deni Bauehschilde des vierten 
Segments der Scolopendrellcn bemerkt. Lange Zeit habe ich an der 
Existenz dieser Oeffnung gezweifelt.” This opening of which he speaks 
is, of course, the anterior genital opening. 
Latzel also discussed the variability of these forms and described 
on page 14 a young Scutigerella nivea which I conclude by comparison 
with young S. immaculata hatched in the laboratory, must have just 
escaped from its egg envelope. 
The first paper to cover at all fully the finer anatomy of one of the 
Symphyla is that of Grassi ( 86) on Scolopendrella ( Scutigerella ) 
immaculata. He discusses with much detail the euticula, nervous 
system and sense organs, the respiratory and digestive systems, the 
dorsal blood vessel, the silk or spinning glands, the ventral vesicles, 
the sex organs, the mouthparts, and finally, the relationship of the 
Symphyla to the Pauropods, the Diplopods, Peripatus, and Campodea 
and Japyx among the Thysanura. 
Haase (’ 89 ) modified and extended somewhat Grassi’s descriptions 
of the coxal sacs or ventral vesicles. With regard to the abdominal 
appendages known as “Huft-griffeln” or parapods he maintains 
(p. 432) that these are not rudimentary legs but that they arc secondary 
paired sense organs developed from hairs which have been modified 
to become locomotor instead of purely sensory. In this interpretation 
he is not supported by other writers. 
Schmidt (’ 95 ) corroborated Haase in his interpretation of the coxal 
sacs as organs of respiration. He, however, opposes the theory put 
forward by Haase with reference to the parapods and maintains that 
these are rudimentary abdominal appendages or legs and each with 
