ENCHYTR^EID^E 



45 



cytes of medium size, globular, with some six or more large and 

 densely staining granules. Color pale citron yellow. 



Locality. In plants brought from Alaska (probably Sitka or 

 Juneau). Presented by Mr. Alexander Craw. A single specimen 

 which was carefully narcotized and fixed in sublimate. 



Note. The specimen having been received late in the year (Sept., 

 1897), the testes and ovaries had degenerated, as careful search failed 

 to reveal any trace of them whatever. The sperm -sacs, on the con- 

 trary, are in a fully developed stage, and full of spermatozoa. The 

 spermathecae and the sperm-ducts are also in a highly developed con- 

 dition, and show no sign of degeneration. 



Characteristics. Characterized by its spermatheca?, the diverticles 

 of which are as long or longer than the duct, while the ampullar part 

 is short. The sperm-ducts widen out to an atrium, the glands of which 

 are comparatively long. The long ducts of the glandular cells are 

 carried far down the sperm-ducts, opening into the duct all along its 

 course down to the very pore. This species resembles greatly M. 

 harrimani, and may be said to be M. harrimani with short sperma- 

 thecal ampulla. 



FIG. 20. Mesenchytrceus grandis. 

 DETAILED DESCRIPTION. 



Brain (fig. 20, c) . The posterior margin of the brain is so indis- 

 tinct that it is impossible to say whether it is strongly concave or only 

 slightly so. I have therefore dotted the line indicating the margin. 

 This indistinctness is not due to any tearing in dissecting, but from the 



