FOLSOM: MOUTH-PARTS OF ANURIDA MARITIMA. 121 
from the head of the maxilla, but through an opening in the constricted 
region nerve fibres may be traced to the lacinia. 
At this stage (7) the first maxillary palpus (Plate 5, Figure 30, p/p.), 
though still present, is no larger than it was in Stage 5 (Figure 22, plp.). 
In the newly hatched insect no trace of this palpus exists, hence it must 
have been resorbed. In the adult Orchesella, on the contrary, the 
palpus is functional and highly developed ; other facts also indicate that 
Anurida is a degraded form. 
Von Stummer-Traunfels (’91, p. 226, Taf. I. Figuren 6, 7), following 
Tullberg (’72, Taf. IV. Figur 17), observed a connection between the 
maxillary palpi and the so-called paraglossz of Collembola, and makes use 
of this union (p. 226) as the first of his reasons for recommending an im- 
proved designation of the mouth-parts, in the following words: “I. Die 
grosse Unwahrscheinlichkeit, dass der sogenannte Maxillartaster der Col- 
lembolen wirklich zur Maxille gehért, indem diese von jenem vollstandig 
getrennt ist und derselbe vielmehr in innigem Verbande mit den Para- 
glossen steht.” Hansen (’93, p. 209) uses this conclusion in proving 
that the ‘“paraglosse ” of Collembola and Thysanura are homologous 
with the first maxille of Crustacea. Without discrediting his conclu- 
sion, I have already shown (Folsom, ’99) upon anatomical data the 
trivial nature of the union between palpus and “ paraglosse” (super- 
lingue). I have now proved upon embryological evidence (Plate 3, 
Figure 22) that the palpus belongs to the maxilla, and have also shown 
(p- 114) that the chitinous membrane connecting it with the superlingua 
is simply incidental, and is only that part of the wall of the maxillary 
pocket which necessarily intervenes between the first maxilla and super- 
lingua of the same side. 
The fundament in Isotoma designated first maxilla by Packard (’71, 
Plate 3, Figure 13) is undoubtedly, from its position in relation to the 
first pair of legs, second maxilla; therefore what he regards in the same 
figure as a wnandible must be a first maxilla. Ryder (86) followed 
Packard in this matter, but Wheeler (’93, p. 57, Figure 6) shows the 
fundaments in their proper position. 
Claypole (’98) correctly identifies the first maxillary fundaments in 
Figures 43, 46, and 47, but does not mention the palpus. 
Uzel (’98) gives a figure of the first maxillary fundaments of Tomo- 
cerus and remarks (p. 36): ‘In jenem Stadium, bei welchem die Um- 
rollung des Keimstreifs vollendet ist, bemerken wir, dass sich die Anlagen 
des ersten Maxillenpaares (Taf. VI. Figur 87, mz.,) in zwei Hocker getheilt 
haben, und zwar in einen fusseren linglichen und in einen inneren 
