6 Mr. J, N. Ilalbeit on Irish Ilydrachnida, 



cliilinous hair-bearing glands. The greater part of the dorsal 

 area is covered by a large shield with sinuous side-margins 

 bounded by the dorsal groove, the rounded posterior margin 

 reaching to the end of the body. This plate is wrinkled 

 longitudinally, and under a high magnification it is seen to 

 have a finely shagreened appearance as well as polygonal 

 reticulations. In front of this large shield lies a short broad 

 plate, emarginate anteriorly, and rather less than half the 

 breadth of the dorsal shield. The dark-pigmented eyes, 

 separated by an interval of about 176 /i, are situated close to 

 the front margin of the body. On the inner side of each eye- 

 group stands a conspicuous hair-papilla. 



The greater part of the ventral side is occupied by the 

 epimeral plates ; the first and second epimera are of the usual 

 shape — except that the first epiraeron is very narrow and 

 tapers inwardly into a ratlier fine point — separated by an 

 extremely narrow interval from the third epimera. The last 

 are quadrilateral in outline, with the front and hinder margins 

 sloping downwards. Tlie fourth epimeron is extremely large 

 and characteristic ; the inner margin is continued for a short 

 distance in a line with that of the third epimeron, it then 

 bends suddenly outwards and downwards in a sinuous line to 

 near the hinder margin of the body, fusing with the chitinous 

 integument of the sides of the body. Near the middle of the 

 fourth epimeral area on each side is a group of long hairs. 

 The epimera are all finely shagreened and reticulated in the 

 same way as the dorsal shield. 



The genital area lies in the anterior space between the 

 fourth epimera ; it is flanked on each side by a long triangular 

 plate, which carries three genital suckers, placed one behind 

 the other, similar in structure to those found in Hygrohates 

 and allied genera. A transverse chitinous plate, in which is 

 imbedded the anal opening, occupies the remaining inter- 

 epimeral space. 



The capitulum is rather small, projecting downwards for 

 part of its length beyond the ventral outline of the body ; 

 maxillary shield measuring about 110 fi in length (not in- 

 cluding subcutaneous process) and 77 /x in breadth. 



The palps are small, the five segments measured along 

 their dorsal margins are 30 fi, 75 /x, 50 /i, 85 /x, 55 fi respec- 

 tively ; segments 1, 2, and 3 may be compared with those of 

 Mideopsis ; 2 and 3 are furnished with a number of rather 

 stout hairs on the dorsal surface ; -4 is the longest palp- 

 segment, it is slightly convex dorsally, with two long fine 

 hairs, ventral surface produced beyond the middle into a well- 

 marked angular promiueuce, on which are two short stout 



