JK.e. 



m.c. 



t 



-U.5 



Centimeters 



rme. 



Fir.vwE 73. — Transverse section of the dorsal part of an adult C. virginica a short distance below the labial palps. Drawn 

 semidiagranimatically from an enlarged photograph of stained section. Bl.s. — blood sinus; br.ef.v. — branchial 

 efferent vein; c.af.v. — common afferent vein; c.t. — connective tissue; di.d. — digestive diverticula; ep.br. ch. — epi- 

 branchial chamber; g. — gills; g.m. — gill muscles; g.r. — gill rod, gn. — gonad; in. — intestine; k. — kidney; l.af.v. — lateral 

 afferent vein; l.m. — left mantle; l.m.e. — edge of left mantle; m.c. — mantle cavity; pr.ch. — promyal chamber; r.af.v. — 

 right afferent vein; r.m. — right mantle; r.m.e. — edge of right mantle; st. — stomach; w.t. — water tube of the gills. 



GENERAL ANATOMY 



69 



