ENCHYTR^ID^ 



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 spermathecas, the divertlcles 

 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 J/, 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 



