Mysiclit>//-o??j the Wesl Coast of Ireland. 1(»'J 



tlie various appendapjcs, the imniber of iiuiibatf^rv lamellae 

 ill the female, aiul the form of the telson and tiroj)ods clearly 

 indicate its position in the LcptomysiniB, among the nuincrons 

 genera of which Ambhjops seems to be its nearest rehitive. 

 Tlie cliaraotcrs of the rostrum, eye, antennal scale, and tel-^on 

 combined abundantly distinguish it from all other genera in 

 the subfamily. 



Genus Dactylkrytiirops, Holt & Tattersall, 1905. 



Non DactylcnjthroiK, lUig, 1900. 



This genus -when first described was compared with 

 Meterythrops, S. I. Smith. The discovery of two further 

 species and of the closely allied genus Dacti/lamljliiops, 

 H. & T., indicates that it is perhaps more nearly related to 

 the genus Ainbhjops, G. 0. Sars, and it may thus be more 

 accurately redefined in the light of this new material as 

 follows : — Characters generally as in the genus Amblyops, 

 G. O. Sars, except : — 



Eyes small; not exhibiting any definite eye stalk, but 

 joined at their bases by a membranous integument; visual 

 elements imperfectly developed, not reaching to the surface 

 of the eye, but rather deeply seated in its tissues; outer 

 distal corner produced into a rather long digitiform flexible 

 process. 



Telson entire, rather small, subtriangular or lanceolate in 

 shape, lateral margins armed distally with more or fewer 

 spines, median apical pair of sette present or absent. 



Incubatory lamellae in the female, two pairs. 



Type species, Dactylerythrops dactylops, II. & T. 



Dactylerythrops urcuata, Illig, should more praperly be 

 referred to the genus Daclylamhlyops. 



Dactylerythrops bid'iyituta, sp. n. 



Carapace covering all the thoracic segments ; cervical 

 sulcus well marked ; produced in front into a broadly 

 rounded obtuse rostrum which reaches to about the centre of 

 the eyes ; antero-lateral corners rounded; emarginate on its 

 posterior border. 



Pleon longer than the carapace ; the first segment one aiul 

 a half times as long as the second, which is subequal to the 

 third and fourth; fifth segment slightly longer than the 

 fourth, sixth segment twice as long as the fifth. 



Eyes small with their basal parts covered by the rostrum ; 

 as far as can be seen, joined to each other at the l)ase by a 



