CYCL0P01DEA. 1235 



The abdomen in males is continuous in outline with the cephalo- 

 thorax, and the whole body has an unbroken ovate, or oblong ellip- 

 tical form. The number of joints is five, and the last is often con- 

 cealed beneath the preceding. 



In females, the abdomen is about half as wide at base as the poste- 

 rior part of the thorax. The number of segments is five or six. The 

 first is smaller or shorter than the following, and bears on either side 

 a small cylindrical appendage, which is one- or two-jointed, and has a 

 couple of setse at apex. The second segment is commonly narrower 

 than the third, and the sides are not often acute. The following two 

 or three segments are generally lunate in form. The terminal seg- 

 ment is narrower than the preceding, and nearly truncate behind. 

 It is often included almost wholly within the concavity of the pre- 

 ceding segment, or the cusps of this lunate segment. 



The caudal stylets are lamellar and never as long as the abdomen. 

 They are generally nearly ovate, with a rounded apex, but are some- 

 times quite narrow and falciform, and occasionally are truncate at 

 apex. They have normally five setse ; one quite short, or reduced to 

 merely an acute point at the inner apex, or on the inner side ; two 

 longer at apex ; one at the outer part of the extremity, and one on 

 the outer side, often distant from the apex. The inner is sometimes 

 altogether wanting, and is not even represented by an angle in the 

 lamella; and in this case there are but four setse. The setse are 

 never longer than the lamellse. Along a longitudinal line within the 

 caudal stylets, there is a duct, which opens outward at the apex ; and 

 often loose shreds were seen projecting from the apex of the stylets at 

 the extremity of each duct. The nature of the duct was not ascer- 

 tained. 



The eyes are of two kinds. One pair has an extremely large prolate 

 lens, and a lenticular cbrnea of still larger size, as already explained. 

 The pigment is an oblong cylindrical mass, of a very deep red, or blue 

 colour, but lighter at the anterior extremity. This extremity is usually 

 oblique, and faces forward and outward. 



The eyes of the other pair (if eyes they are) are placed between the 

 inner lenses just described. The two constitute a minute oval spot, 

 only distinguishable under a lens of considerable power. This spot 

 has a deep colour at the forward and hinder extremity, and appears 

 to be divided longitudinally. No very distinct idea of the nature of 



