THK ANATOMY OK MKCiALATUACTUS — KRSTEVEN. 



437 



and opens at the tip of the organ on a papilla which is partly 

 enclosed in a muscular sheath or deprtission. Whether this 

 papilla is extensile or not I am unable to say; it certainly is nob 

 evaginable, l)ut is a solid piece of soft tissue. 



Fkmalk — The orari/ and lUc.ras conform in all particulars to 

 the descriptions of these organs given under the other species. 

 The oviduct was not found, and for this omission I must again 

 plead the poor state of preservation of the material examined. 



7. A Section through the Proboscis. 

 (Fig. 122.) 



Although the state of preservation of the specimens was such 

 as to make the use of the microtome valueless for histological 

 research, I have made a few thick sections (at about 20 ^i) of the 



Fig. 122. 



Camera lucida sketch of the oesophagus, salivary duets, and portion of 

 the wall of the proboscis, on a level with the middle of the radular-sac. 



1, Circular muscle strands; 2, a layer composed of muscle strands and 

 connective tissue ; .3, longitudinal muscle strands ; 4, salivary duct ; 5, 

 circular muscle strands ; 6, enteric epithelium ; 7, cuticle ; 8, longitudinal 

 muscle strands; 9, salivary duct; 10, deric epithelium; 11, cuticle; oes., 

 oesophagus. 



anterior end of the proboscis for anatomical research. The 

 tissues are very much spoiled and displaced, but the organs lie 



