108 CHARLES D. SOAR AND W. WILLIAMSON ON 



perhaps too mucli, has been given in recent years to the varying 

 outline of the bridge between the capsules. The epimera are of 

 a much more delicate structure than is found in other genera. 

 They are for the most part narrow, and are formed of a lattice- 

 work framed by a well-defined ridge. The genus also furnishes 

 some of the largest forms to be met with in the Hydracarina, the 

 type {E. extendens) sometimes attaining a length of 5 mm. In 

 order to facilitate the work of those whose studies in variation 

 might lead them to consider its aspects as expressed in Eylais, 

 a list of other recorded species known to us at this date, with 

 appropriate bibliographical references, was prepared, but the 

 economic conditions now prevailing necessitate restriction to 

 species occurring within the Britannic area.^ 



Additions to the British Fauna are indicated thus * and to the 

 Britannic area thus f. 



Eylais extendens (Miill.) (PI. 3, fig. 10). 



The body is oval in outline, and is dorso-ventrally compressed. 

 The legs and palpi are a paler red than the skin of the body, which 

 is covered with ridge-like markings. The pores of the dermal 

 glands are very small and are protected by a strong and rather 

 large hair. 



The eye capsules are relatively short and broad, and are com- 

 posed of a coarsely granulated chitin, which appears to be thick- 

 ened at the edges of the capsules. The intercapsular bridge is short, 

 being about one-third the length of the capsules, and is moderately 

 broad. The anterior margin has a slight concavity in the middle, 

 and the strong process for muscle attachment does not extend 

 beyond the margin. Between each capsule and the process there is 

 a sensory organ, one on each side, furnished with a long and strong 

 bristle. The anterior eye lens is large and stalked, while the 

 posterior lens is of a long ellipsoidal form. 



The palpi are not so stout as the segments of the first pair of 

 legs and are less than one-fourth the length of the body. The 

 flexor surface of the first segment is very much shorter than the 

 extensor. The second segment has very few bristles on its 

 extensor surface. The third segment is of about the same length 

 as the second, and has a number of spines on its extensor surface. 



^ It may be possible to publish this list at some future date in the 

 pages of the Journal. — Ed. 



