O14 GEOLOGICAL SURVEY OF THE TERRITORIES. 
With this view, with some restrictions, we would agree, and while be- 
lieving that the use of the terms antenna, mandible, maxilla or maxil- - 
lipede would be authorized within the limits of the same subclass, as 
the normal, neocaridan crustacea, or the Merostomata (which we certainly 
would not consider as branchiate scorpions), with the Trilobita (Palewo- 
carida), or either of the three subclasses Travheata or Insecta, 7. e., Heaxa-' 
poda, Arachnida, and Myriopoda ; the different pairs of appendages must 
receive different names in different subclasses. The following table will 
give our idea as to the nomenclature of the appendages in the three sub- 
classes of Tracheata and the two subclasses of Branchiate Arthropods. 
TABLE A. 
g 
A 
o 
a 
2 
2) d . Crustacea (neoca- Merostomata. 
es Hexapoda. Arachnida. Myriopoda. rida decapoda). (urns) 
9 
2 
as 
a ‘ 
1 | Antenn® -........- Mandible -.....-.. Antenns .......- First antenns ... | First (preoral) 
eg. 
2 | Mandibles.-.-....-. Maxilla (chela) ...| ‘‘Maxilla”........ Second antennxy ..| Second (post- 
oral) lee. 
3 | First maxille...-. First thoracic leg_| ‘‘ Mandible”... -.. Mandibles -.-..... Third pair legs. 
4 | Second maxille | Second thoracic | ‘‘Labium”’........ First maxilla ....| Fourth pair legs. 
(labium). leg. : 
5 | First thoracie | Third thoracicleg.| First pairoflegs..| Second maxilla...) Fifth pair legs. 
legs (benopods). 
6 | Second thoracic | Fourth thoracic | Second pair oflegs.| First maxillipedes| Sixth pair legs. 
legs (beenopods). leg. 
7 | Third thoracic | Embryonic, decid-| Third pair of legs.| Second maxilli- | First abdominal 
legs (baenopods). uous pedes. legs. 
8 | First embryonic |....do....-.......- Fourth pair of legs} Third maxillipedes| Second abdomi- 
deciduous legs.* nal legs. 
9 | Second embryonic |..-.do ...---.-.-.-- Fifth pair of legs .| First pair of legs | Third abdominal 
deciduous legs. (beenopods). — legs. 
10 | Third embryonic |.-..do ..........--.. Sixth pair of legs..| Second pair oflegs | Fourth abdomi- 
deciduous lege. (beenopods). nal legs. 
11 | Fourthembryonic | First pair spin- | Seventh pair of | Third pair of legs | Fifth abdominal 
deciduous legs. nerets. egs. (beenopods). legs. 
12 | Fifth embryonic | Second pair spin- | Eighth pair of legs} Fourth pairoflegs | Sixth pair abdom- 
deciduous legs. nerets. (beenopods). inal legs. 
13 | Sixth embryonic | Third pair spin- | Ninth pair of legs | Fifth pair of legs 
deciduous legs. nerets. (beenopods). 
14 | First pairofrhab- | Telson of scor- | Tenth pairoflegs-| First abdominal 
dites.t pion. legs (uropods). a 
118) || Secomals pantie. Ose |. ss5csedqocusedosede Eleventh pair of | Second abdominal | Telson (spine). 
rhabdites. egs. legs (uropods), 
16 | Third pair ofrhab- |....-........------- Twelfth pair of | Third abdominal 
dites. legs. legs (uropods). 
UC |), © OreOSOMOGME — Gi esasahacacoosuscones Thirteenth pair | Fourthabdominal 
some Orthoptera of legs. legs (uropods). 
and Neuroptera, 
and anal legs of 
caterpillars. 
NG |) UG W Eww ly Bde Nedsstoesasseasodeans Fourteenth ....... Fifth abdominal 
dominal seg- legs (uropods). 
ment in some 
Orthoptera and 
Pseudoneurop- 
tera. 
Th) eel gene VO IgE 8 Wn Seen eae tna ys Fifteenth ......--. Sixth abdominal 
legs (uropods). 
CKD Ns ay aerate Ue PU EE RS WIS LS ee ee Sixteenth; 200th | Telson.----.....-- 
in Geophilus.t 
* See Kowalevsky, Embry., Studien an Wiirmern und Arthropoden, 1871, Plate XII, fig.10. Embryo 
of Sphina populi, in which the first ten abdominal segments have temporary rudimentary appendages, 
some of which persist in the caterpillar, serving as 
rop-legs. 
+ The ovipositor of insects, as we originally pointed out in 1868 (Proc. Boston Soc. Nat. Hist., xi, 393), 
is primarily composed of three pairs of appendages (called by Lacaze-Duthiers ‘‘rhabdites”’), which arise 
_ in the same way as the legs; this view 
as been confirmed by Ganin, Kraepelin, and Dewitz. 
+The number of movable segments in the Geophilide, according to Newport, varies from about 
35 to more than 200. ‘ 
