DESCRIPTION OF PLATES 



iREVIATIONS 



abd.gl., abdominal gland 

 c. 7nu.. circular muscle layer 

 cl. a.p., cloacal aperture 

 cl. ch., cloacal chamber 

 cl. gl., cloacal gland 

 cl.gl.a.. cloacal gland, area of 

 cl.lp.. cloacal lip 

 cl.lp.f., cloacal lip, fissures of 

 cl. t., cloacal tube 

 C.L.S., connecti've-tissue septum 

 d.g., dorsal ganglion 

 ext.p.. external papilla 

 inl.pp., internal papillae 

 ll.j., lateral fold 

 It.fur., lateral furrow 

 l.mu., longitudinal muscle layer 

 md.gr., median dorsal groove 

 md.g.w., median dorsal groove, wall of 

 niv.J.. median ventral fold 

 mv.s., median ventral septum 

 mes., mesonephros 



m.cf., muscle caudalifemoralis, im- 

 pression of 



m. cpit., muscle caudalipuboischio- 

 tibialis. impression of 



m.isc, muscle ischiocaudalis, im- 

 pression of 



pl.gl.' pelvic gland, median caudal 

 division 



pl.gl.", pelvic gland, median cranial 

 division 



pl.gl.'", pelvic gland, lateral division 



p., peritoneum 



rectum, rectum 



l.c.gr., transverse crescentic groove 



iig.d., urogenital duct 



ug.p., urogenital papilla 



ur.hL, urinary bladder 



ur.bl.cav., urinary bladder, cavity of 



-iir.bl.o., urinary bladder, orifice of 



ur.t., urinary tubules 



vl.rec, ventrolateral recess 



v.f., secondary ventral folds 



v.r., ventral ridges 



r).tr., ventral trough 



y. Y-shaped area 



PLATE 1 



EXPLANATION OF FIGURES 



1 Ventral view of the pelvic region of a male Necturus, showing the super- 

 ficial topography of the cloaca. Drawn from a live animal in May. 



2 Lateral view of the entire gland mass. Dissected from a specimen which 

 had been hardened in alcohol. 



3 Dorsal view of the entire gland mass. Dissected from a specimen which 

 had been hardened in alcohol. 



4 Dorsal view of the cloacal cavity. The cloaca was slit longitudinally, 

 slightly to one side of the midventral line, and laid open. The cloacal gland is 

 completely divided. Dissected from a specimen which had been hardened in 

 alcohol. 



5 Ventral view of the cloacal ca-vity, laid open by a longitudinal incision 

 along the middorsal line. Pelvic gland is completely divided. Dissected from a 

 specimen which had been hardened in alcohol. 



460 



