496 RICHARD EVANS. 



the distal margin. This displacement only takes place on 

 either the anterior or posterior aspect of the foot, or on both 

 together. In snch cases the foot presents an appearance 

 which has a certain resem\)lance to the condition found in 

 other Peripatida3 where it is provided with more than two 

 papillae. 



c. Internal Anatomy. 



(a) Introductory Remarks : — The internal anatomy of 

 all the Peripatidse presents a great degree of resemblance; 

 consequently it is not necessaiy to describe at length the 

 whole anatomy of the species here considered ; but as they, 

 together with E. sumatrauus, constitute a new genus, it is 

 advisable to describe some systems of organs at gi'eater 

 length than wonld be otherwise necessary. 



The muscular and vascular systems call for no speciiil 

 remark. The nervous system resembles that of other 

 genera to such a degree that there is no need to describe it 

 further than to mention one or two points which seem to 

 demand attention. One of the points in question is the 

 difference between the male and the female nervous systems 

 immediately in front of the genital orifice. In the male the 

 cords are provided with specially enlarged swellings or gan- 

 glia in the above-mentioned position (tig. 35), while in the 

 female there is no such swelling beyond that which occurs 

 opposite each pair of legs (fig. o3). The second point 

 is the well-developed condition, even in the adult, of the 

 strands of nervous matter which pass from the lateral nerve- 

 cords to the ventral organs. These strands contrast strongly 

 with the nerves given off from the nerve-cords to the body- 

 wall and the legs, in that they consist of cells in the more or 

 less undifferentiated state in which they are found in the 

 lateral nerve-cords (fig. 34). 



{b) Ventral Organs. — As the ventral oi-gans have been 

 mentioned already, it is advisable to describe them at the 

 present juncture. I'hey occur between each pair of legs in 

 the mid-ventral line, and correspond to the segmentally 



