424 Dr. W. Michaelsen on the EnchytraiidEe. 



species (whicli I name B. fallax) shows the arrangement of 

 the sexual organs which is normal in the Enchytraidse. But 

 even leaving out of consideration the definitions in question 

 as given in the diagnosis formerly published, the genus 

 Buchholzia must be sustained. 



The BuchJiolzice belong to the section of the Enchytrseidse 

 with sigmoidally-curved setae. They possess no dorsal 

 pores, but have a head-pore, which is situated between the 

 head-lobe and the cephalic ring. The lymph-corpuscles are 

 present in both the known species in two forms (fig. 4 h), 

 namely small, limpid, navicelliform, and without a recogniz- 

 able nucleus, and larger, finely granulated, flat-ovate, with a 

 distinct nucleus. They are the only Enchytrseidge provided 

 with sigmoidally-curved setse which possess salivary glands. 

 These are very much reduced, stumpy, or at the utmost 

 but little lobed, and they open laterally into the oesophagus, 

 not close behind the pharynx, but further back, in segment IV. 

 The blood is colourless. The dorsal vessel originates in 

 segment Vii. from the intestinal blood-sinus, upon a diver- 

 ticulum produced by growth of the intestinal epithelium. 

 The seminal ducts are long. The oviducts (judging of the 

 whole genus from observations on B. fallax) are as I have 

 found them in the other Enchytrseidge. The seminal sacs 

 communicate with the intestine. 



Buchholzia appendiculata^ Buchholz. 



Enchytrceus appendiculatus, Buchliolz (10). 

 Enchytrceus {Mesenchytrceus) appendiculatus, Vejd. (7 and 8). 

 Enchytrceus {Mesenchytrceus?) appendiadattcs, aut. (4). 

 Buchholzia appendiculata, aut. (9). 



The accurate descriptions which have been given of this 

 interesting worm by the above- cited authors render any 

 repetition of them here unnecessary. 



I found this species in flower-pots and in garden-mould 

 at Borgfelde, near Hamburg. 



Buchholzia fallax^ nov. spec, 



is a slender worm, about 10 millim. in length, of a white 

 colour with a slight brownish tinge. The setse (fig. 4 a) are 

 strongly sigmoidally curved, and there are usually four or 

 five, rarely six, in each tuft. The setse of the same bundle 

 are of dift'erent length, and so arranged that a ventral bundle 

 and the corresponding superjacent lateral one turn the longer 

 set£e towards eacli other. Head-pore as above described. 



