NO. 14 



INSECT ABDOMEN SNODGRASS 



45 



penes into the grooves of the mesal lobes and the pockets at their bases 

 on the first gonopods, and are discharged into a receptacular pouch 

 (annuhis ventralis) on the venter of the female between the sterna 



FiG. 17. — Crustacea-Malacostraca-Eucarida : male genitalia of a crayfish, 

 Caml)a<nis virilis. 



A, posterior view of lower part of last thoracic segment, showing small penes 

 projecting mesally from coxopodites. B, first gonopods projecting forward, 

 anterior (upper) surface. C, testes and vasa deferentia, dorsal view. -D, first 

 gonopods (normally projecting forward in ventral channel of thorax), posterior 

 (under) surface. E, second gonopods, posterior (under) surface. 



a, distal shaft of first gonopod ; b, c, outer and inner branches of ventral lobe 

 of first gonopod ; Cxpd, coxopodite ; d, distal lobe of second gonopod ; Dej, ductus 

 ejaculatorius ; Endpd, endopodite ; Expd, exopodite ; Gpr, gonopore ; Pen, penis ; 

 PI, pleuron ; Stn, sternum; T, tergum ; Tes, testis; iTr, first trochanter (basip- 

 odite) ; Vd, vas deferens. 



of the seventh and eighth thoracic segments. (See also Andrews, 

 1906.) 



The crabs (Brachyura) dififer from most of the other decapods 

 in that the female has a pair of large pouchlike sperm receptacles 



