TTTE CRAYFISH. 



PLATES VIII. TO X. 



THE CEAYFISH. 



a. Anus. 



.' Anal valve. 



a.a. Antounary artery. 



<ib. Abductor muscle. 



nl'. 1-6. Abdominal appendages, If'.. 



a.li. Arthrobranchia, external set. 



a.b'. Arthrobranchia, internal set. 



nfiil. Abdomen. 



a.c. Alary muscles. 



ad. Adductor muscle. 



(/././/(. Adductor muscle of mandible. 



a.y. Anterior gastric muscle. 



a.h. Auditory hair. 



c/. Archeuteron. 



a.m. Articular membrane. 



amli. Ambulatory legs. 



an. Antennary muscles. 



an'. Antennule. 



an". Antenna, 



a. /i. Abdominal papilla. 



ur. Articular facet. 



an. Auditory sac. 



an'. External aperture of the same. 



IK: Brauchiostegite. 



l>.c. Branchio-cardiac trunks. 



li.i-h. Branchial chamber. 



I'.il. " BUe-duct." 



hi. Blastoporo. 



In: Gill. 



br.a. Afferent branchial vessel. 



lir.c. Branchio-cardiac groove. 



lir.e. Efferent branchial vessel. 



la. Basipodite. 



c. Carapace. 



e.a. Anterior transverse nerve-commissure. 



c.an. Annulate corpuscle. 



/. Cardiac chamber. 



cd'. Dorsal cardiac ossicle. 



cJ". Median cardiac ossicle. 



cd.l. Lateral cardiac ossicle. 



c.i/. Constrictor muscles of stomach. 



c/i. Chela, 



v.l. 



c.m. 



on. 



ea. 



c.ov. 



cp. 



c.p. 



./>'. 



c.r. 



ct'. 



ct". 



cv.y. 



cj;. 



CJ'.S. 



ilc. 



ec.u. 

 en. 

 en.o. 

 e.o. 



<-!> 

 ,'.1.1. 



i' /'in. 



e.x. 



e.t. 



f.V. 



f.r.a. 



f.t. 



.'/ 



y.a. 



i/.ab. 



<in 1-20. 



Longitudinal nerve-cnmmissnre. 



Muscles of chela (basal joint of). 



Cornea. 



Ctt-cuui. 



Ovoid corpuscle. 



Carpopodite. 



Cardio-pyloric muscle. 



Posterior transverse nerve-commissure. 



Crystalline rods. 



Cuticular lining of fore gut. 



Cuticular lining of hind gut. 



Cervical groove. 



Coxopodite. 



Coxopoditic .;.(. 



Dactylopodite. 



Depressor muscles of stomach. 



Dilator muscles of stomach. 



Epistoma. 



Epiblast. 



Ectostracum. 



Endopodite. 



Endoistracum. 



Epiostrocuui. 



Epipodite. 



Endopleurite. 



Epimeron. 



Eyestalk. 



Endosteruite. 



Exopodite. 



Extensor abdominis muscle. 



Follicular epithelium of ovisao. 



Fore gut. 



Flexor abdominis muscle. 



Fatty connective tissue. 



Gastrolith. 



Genital aperture. 



Abdominal ganglia. 



Cerebral ganglion. 



Green gland, aperture of. 



Siibffisophageal ganglion. 



Ganglia 1-20. 



Optic ganglion, 



