Co E. — Nemerteans. 



PLATE 13. 



Carinoma mutabUis Griffin. 



Fig. 81. Transverse section of body in esophageal region, siiowing outer 

 circular, diagonal, longitudinal and inner circular muscular layers, 

 the ventral and dorsal pairs of lateral blood vessels (Iv, Iv'), the 

 rhynchocoel vessels (rev), the dorsal and ventral median nerves, 

 etc. X 40. 



Fig. 82. Transverse section of body in po.sterior portion of stomach region, 

 showing the enormously developed inner circular musculature, 

 and the narrow^ lumen of stomach and of proboscis sheath. On 

 both sides of body two nephridial canals are cut {nep), those on the 

 right side being cut a little more posteriorly than those on the 

 left, where the section passes through the efferent nephridial 

 duct (nd). Compare PI. 14, figs. 83, 84. On the right side the 

 efferent duct is seen in section, in contact with the dorsal lateral 

 vessel (dv'), and its course to the exterior indicated by dotted 

 lines. The dorsal and ventral median nerves are conspicuous in 

 this region of the body. X 40. 



Note.— Figs. 78, 81, 82, 83, 87, 88, 89, Pis. 12 to 15 forms a series of 

 transverse sections through the principal anatomical regions of the body. 



