anguillulim: from tropical orchids. 79 



it. The conspicuous chitinous tube of the oesophagus, as 

 usual a direct continuation of the spear, is cylindroid, 

 the transverse optical section appearing circular, and the 

 wall of this part of the oesophagus is rather thin. The 

 latter terminates in a rather large bulb, which is one 

 and-a-half as long as it is broad, and which measures 

 almost one-fourth of the distance between its posterior 

 margin and the mouth ; the bulb-wall is distinctly mus- 

 cular, and the dilatation of the central tube is 5 /x long 

 and 3, 6 /x broad. Behind the bulb the alimentary canal 

 continues, at first very narrow, but afterwards gradually 

 widening. The wall of the intestine contains mostly 

 numerous fat-granules. The excretory pore lies usually 

 just behind the bulb, sometimes, however, opposite its 

 posterior portion (fig. 1 a) . 



I observed (PI. Ill, fig. 1) next to the anterior part of 

 the intestine, on its dorsal side, a gland of an elongated 

 form, the nature and the function of which, however, 

 remain unknown. This gland is considerably longer than 

 the oesophagus ; in the female nearly one and-a-half as 

 long, and includes a circular nucleus, which is 9 /x broad. 

 A more careful examination is necessary to elucidate the 

 signification of this organ. The genital tube of the male 

 is simple, and sometimes it seemed to me that the blind 

 end was renexed for a short part. The rather large 

 spicula (PL IV, fig. 1 c) have a characteristic form. Their 

 length, i.e., the linear distance between their two extremi- 

 ties, measures 18 ^ ; they are slightly arcuate, the proximal 

 ends are capitate, and the distal ends are obliquely cut 

 off, whereas they bear a triangular prominence on their 

 anterior margin. An accessory piece is wanting. I 

 observed a little in front of the anus, a single conical 

 papilla, situated in the ventral middle line of the body, 

 and the tail itself bears two pairs of sub-ventral papillae ; 



