D. J. SCOURFIELD ON EPHIPPIA OF LYNCEID ENTOMOSTRACA. 235 



many loose pieces of chitin developed. The inner membranes 

 are delicate and very confused, and cannot be said to make any 

 approach to a definite capsule, although they do probably form 

 a closed sheath for the egg. 



Fleuroxus trigonellus (O. F. Miiller). 

 I have not seen the ephippium of this form for many years, and 

 my very rough sketch of it is not suitable for reproduction. 

 It shows, however, that the general outline is closely similar to 

 the two foregoing species, and that the dorsal margin is con- 

 siderably thickened. I noted that the shell was darkened as 

 usual, especially over the egg. 



Fleuroxus uncinatus Baird. 

 A sketch of the ephippium of this species made some years ago 

 indicates that it is very much the same as those of the other 

 Pleuroxids already referred to, although the dorsal margin seems 

 somewhat longer in proportion, and the new ventral margin does 

 not cut the ventral edge of the shell so far back. The hexagonal 

 shell sculpture is the same as in the ordinary female, and the 

 egg is protected by inner membranes, but no notes were made as 

 to their exact nature. 



Dunhevedia sp. 

 In some material kindly sent to me by Mr. F. E. Allum, of 

 Perth, Western Australia, from " Herdsman's Lake," near that 

 €ity, I found an ephippium which undoubtedly belongs to a species 

 of Dunhevedia. It is shown in Fig. 29. The greater part of the 

 ephippium (the area, in fact, within the dotted line) is very dark 

 brown, and the chitin is minutely pitted, but there is no evident 

 shell sculpture. The dorsal margin is well thickened, the anterior 

 margin has a rather wavy outline, and the ventral line of weak- 

 ness, instead of running out to meet the ventral edge of the shell, 

 is carried back to the middle of the posterior margin. The egg 

 is comparatively very large, and it is completely surrounded by 

 irregularly disposed membranes. Viewed from the top or front, 

 the ephippium is seen to bulge considerably over the egg (Fig. 30). 



Chydoims sphaericits (0. F. Miiller). 

 The ephippium of this common little Lynceid is shown in 

 Fig. 31. It will be noticed that the dorsal margin is much 



