78 TEANSACTIONS LIVEEPOOL BIOLOGICAL SOCIETY. 



Both the male and the female of this new species have 

 a moderately slender body. The body tapers slightly 

 anteriorly, so that the diameter of the head at the con- 

 stricted neck measures one-third of the greatest width of 

 the body. The tail has a very characteristic shape. That 

 of the female (PL III, fig. 1 d) almost constantly a little 

 longer than the oesophagus, appears slender, elongated, 

 tapering regularly ivith a hair-like termination. The tail 

 of the male (PI. IV, fig. 1 c) is constantly slightly shorter 

 than the oesophagus, and tapers rather gradually along 

 its anterior two-thirds, behind the papillae suddenly much 

 more, the termination fine, though not so hair-like as in 

 the female. There is no caudal gland. The cuticula, as 

 is usually the case with the species of this genus, 

 destituted of setae, is very finely striated ; it is very thin, 

 measuring only 0*9 — 1 /*, and the striae are so fine that it 

 was only at the anterior extremity of the body, opposite 

 the spear, that I succeeded in observing them distinctly. 

 A lateral membrane (" Seitenmembran ") is probably 

 wanting. 



The truncated head (PI. Ill, fig. 1 b) presents six 

 rounded lips or lobes at the periphery, that may best be 

 studied in a front view of the head. These lips bear no 

 papillae. The spear is 24 — 27 /* long, cylindroid, without 

 bulbs at its posterior extremity, and obliquely cut off at 

 the sharp anterior end like the spear of the species of the 

 genus Dorylaimus. The wall that surrounds the spear 

 and that is a continuation of the muscular wall of the 

 oesophagus is somewhat thicker than the latter. I believe 

 I have observed a spear-collar, as is generally found in the 

 species of the genus Dorylaimus. Two long muscles, 

 that originate from the body-wall near the neck-like 

 constriction of the head, are attached at the posterior 

 extremity of the spear, and serve evidently to protrude 



