HYDRACARINA : THE GENUS EYLAIS LATR. 113 



bridge is about one-tbird tbat of tbe capsule. The presence 

 of two lateral tubercles and a larger, more or less, protruding 

 median process gives to the anterior margin tbe appearance of tbree 

 arcbes, wbence tbe specific name. Tbe posterior margin may be 

 evenly rounded or may bave a truncated appearance. Tbe edges 

 of tbe tubercles are ratber tbick. 



Tbe palpi may attain a lengtb of over 0*8 mm. Tbe distal end 

 of tbe flexor surface of tbe tbird segment is swollen, and towards 

 tbe inner surface tbere may be about fifteen sbort spines, some of 

 wbicb are bipectinate. Tbe bristles on tbe fourtb segment tend 

 to display irregularity in tbeir arrangement. Tbe extensor 

 surface bas two or tbree long bristles. Tbe fiftb segment bas a 

 large number of long and sbort bristles. 



Tbe anterior processes of tbe capitulum are directed obliquely 

 backwards in an upward direction ; tbe posterior processes are 

 moderately developed. Tbe pharynx extends posteriorly beyond 

 tbe extremity of the posterior process, and is widest about tbe 

 middle. The pharyngeal ridge is broad and tbe metapharyngeal 

 area is long and rounded posteriorly. The air sacs extend beyond 

 tbe posterior end of tbe pharynx. 



Tbe epimera and legs are similar to those of ext^dens. So far, 

 only tbe female is known definitely. The length varies from 3 to 

 5 mm. It has been found near DubUn, and in some other parts of 

 Ireland, and is also recorded from Italy, Bohemia, Hungary, 

 Germany, Russia, Sweden and Finland. It was recently recorded 

 from S. Devon, and material taken at Norfolk Broads, Mill 

 Hill and in Suffolk and Kent appears to be referable to this 

 species. 



Eylais rimosa Piers. (PL 3, fig. 4). 

 1899. Piersig. Zool. Anz., vol. xxii. p. 65, fig. 6. 



This is one of the moderately large species, the lengtb ranging 

 from 3 to 3*5 mm. 



Tbe anterior edge of the intercapsular bridge bas two rounded 

 projecting protuberances, each with a long hair. Between each of 

 tbe protuberances the bridge is cleft as far as the process for 

 muscle attachment. Tbe posterior margin is deeply recessed ratber 

 beyond the middle of the capsules. Tbe anterior eye lens is of 

 medium size and is set on a sbort stalk. 



