British Enchytrseids. By 'Rev. H. Friend. 



131 



tends in the fully adult worm from the setae of segment 7 to 

 those of segment 9, and includes the whole of the 8th segment. 

 Here the blind sac is situated internally from which the dorsal 

 vessel takes its rise. The oesophagus suddenly emerges in this 

 segment into the enlarged intestine. The brain is about as long 

 as broad, varying somewhat under tension ; slightly convex in 

 front ; straight, or slightly convex when strained ; not incised, but 

 nearly straight behind. Sperm-funnels rather large, about 2x1, 

 somewhat mobile and variable, with fairly stout ducts, opening 

 into a moderately large atrial gland-pore on segment 8. Large 

 nephridia-like salivary glands in segment 4. Nephridia seen in 8/9 

 and later as in Chamsedrilus, but not observed in the anterior seg- 

 ments. Duct a continuation of the postseptal. Coelomic corpuscles 

 of two kinds, larger and smaller. Very characteristic sperma- 



Fig. 16. — Buchholzia tenuissima sp. n. 

 1. Brain. 2. Spermatheca. 



thecse (fig. 16), with bulbous ampulla attached to oesophagus, and 

 stout duct tapering to 4/5 opening without glands. 



Five specimens were examined, of which three were adult and 

 agreed in all particulars. The details respecting their length and 

 number of segments may not be without interest. 



1. Immature 

 2. 



3. Mature 



4. „ 

 5. 



There is thus a difference of fourteen segments and 4 mm. even 

 in the adults. The length usually agrees with the number of 

 segments. 



