282 CHAS. D. SOAR ON TWO NEW SPECIES OF HYDRACARINA. 



lateral process about 0*16 mm. The air-sacs are broad and 

 straight when viewed from the front, but curve outwards towards 

 the outer margin of the pharynx. The figure (fig. 2) has been 

 drawn from a mounted specimen, so it is quite possible it appears 

 flatter than when in a living condition. The palpi are very like 

 those of the type species except that they appear to be more fully 

 provided with hairs (figs. 3 and 4). The segments (1-5) measure 

 as follows: 0*14 mm., 0*28 mm., 0*28 mm., 0*60 mm., 0*26 mm. 

 These measurements are taken on the outside, extensor margin. 

 The surface of the skin is strongly marked. 



Descriptions of Plates. 



Plate 20. 

 Dartia Harrisi gen. et sp. nov. 



1. Dorsal surface. 



2. Ventral surface, showing epimera and genital area. 



3. Inner surface of right palp. 



4. Genital area, showing relative position of anus. 



5. Second leg ; articulation of fifth and sixth segments. 



Plate 21. 

 Eylais Wilsoni sp. nov. 



1. The eye and eye- capsules. 



2. Capitulum. 



3. Inner surface of right palp. 



4. End of palp. 



Journ. Quekett Microscopical Club, Ser. 2, Vol. XIII., No. 80, April 1917, 



