374 



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 mnxil- 

 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 Trilohita {Palwo- 

 carida), or either of the three subclasses Tracheata or Insecta, i. e., Sexa- 

 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. 



fcX) 



O 

 o 



a 



Hexapoda. 



Arachnida. 



Myriopoda. 



Crustacea (neoca- 

 rida decapoda). 



Merostomata. 

 (Limulus.) 



1 







AntennsB 



"Maxilla" 



"Mandible" 



"Labium" 



First pair of legs.. 



Second pair of legs. 



Third pair of logs . 



Fourth pair of logs 



Fifth pair of legs . 



Sixth pair of legs . . 



Seventh pair of 



legs. 

 Eigiithpair of logs 



Ninth pair of legs 



Tenth pair of legs . 



Eleventh pair of 



legs. 

 Twelfth pair of 



legs. 

 Thirteenth pair 



of legs. 



Fourteenth 



Fifteenth 



First antennsB ... 



Second antennas . . 



Mandibles 



First maxillae 



Second maxillss... 



First maxillipedes 



Second maxilli- 

 pedes. 

 Third maxillipedes 



First pair of legs 



(bsenopods). 

 Second pair r.f legs 



(bainopods). 

 Third pair of legs 



(bffinopods). 

 Fourth pair of legs 



(beenopods). 

 Fifth pair of legs 



(b;onopods). 

 First abdominal 



legs (uropods). 

 Second abdominal 



legs (niopods). 

 Third abdominal 



legs (uropods). 

 Fourth abdominal 



legs (uropods). 



Fifth abdominal 

 legs (uropods). 



Sixth abdominal 



leu;s (uropods). 

 Telson 



First (preoral) 

 leg. 



Second (post- 

 oral) leg. 



Third pair legs. 



Fourth pair legs. 



Fifth pair legs. 



Sixth pair logs. 



First abdominal 



legs. 

 Second abdomi- 



2 



3 



4 



5 

 6 

 7 

 R 



Mandibles 



First maxillje 



Second maxillae 



(labium). 

 First thoracic 



legs (l)renopod8). 

 Second thoracic 



legs(bit>nopods). 

 Third tlior ac i c 



legs (bajnopods). 

 First embryouic 



deciduouslegs.* 

 Second embryonic 



deciduous legs. 

 Tliird embryonic 



deciduous lego. 

 Fourth embryonic 



deciduous logs. 

 Fifth embryonic 



deciduous legs. 

 Sixth embryonic 



deciduous legs. 

 First pair of rhab- 



dites.t 

 Second pair of 



rliahditcs. 

 Third pair of rhab- 



dites. 

 Cercopoda of 



someOrthoptera 



and Neuroptera, 



and anal legs of 



caterpillars. 

 Eleventh ab- 

 dominal s e g - 



ment in some 



Orthoptera and 



Psoudoneurop- 



tera. 



Maxilla (chela) . . . 



First thoracic leg. 

 Second thoracic 



leg. 

 Third thoracic leg. 



Fourth thoracic 

 leg. 



Embryonic, decid- 

 uous. 



....do 



q 



....do 



nnl legs. 



in 



....do 



legs. 



11 



12 

 13 

 14 

 15 



First pair spin- 

 nerets. 



Second pair spin- 

 nerets. 



Third pair spin- 

 nerets. 



Telson of scor- 

 pion. 



Hill legs. 



Fifth abdominal 

 legs. 



Sixth pair abdom- 

 inal legs. 



Telson (spine). 



Ifi 





17 







18 







10 







'>() 







Sixteenth; 200th 

 in Geophilus.J 















* See Kowalevsby, Embry., Stndien an Wurmem und Arthropoden, 1871, Plate XII, fig. 10. Embryo 

 of Sphinx pppidi, in which* the first ten abdominal segments have temporary rudimentary appendages, 

 some of which persist in the caterpillar, serving as prop-legs. 



t The ovipositor of insects, as wo 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 has been confirmed by Ganin, Kraepelin, and Dowitz. 



J The number of movable segments in the Geophilidse, according to Newport, varies from about 

 35 to more than 200. 



