AND ON THE NORTH EAST COAST OF ENGLAND. 6 1 



female (fig. 3) seven-jointed, rather profusely setose, the com- 

 parative length of the joints as follows : 



I- 2. 3. 4. 5. 6. 7. 



9 10 6 3 4 3 3 



Antennse and mouth-organs normal. Hand of the posterior 

 footjaw (fig. 5) rather elongated, narrow, and angulated near 

 the middle of the outer margin, terminal unguis long, slender, 

 and slightly curved. The first four pairs of feet have the 

 inner branches two-jointed, outer branches three-jointed; in 

 the first pair (fig. 6) the outer branch is about half as long as 

 the first joint of the inner branch, the second joint of the inner 

 branch about one-fourth as long as the first joint, the slender 

 terminal claw fully twice as long as the joint from which it 

 springs ; in the second and third pairs of feet (fig. 9) the inner 

 are about half as long as the outer branches ; the fourth pair 

 are considerably reduced in size, and the inner branch is 

 smaller than in the preceding pairs (fig. 10) ; fifth pair (fig. 11) 

 foliaceous, rather short and broad, inner margin of the first 

 joint obliquely subtruncated and bearing five nearly equal 

 setse, second joint broadly ovate and bearing six subequal 

 setae, margins of both joints beyond and between the setas 

 finely ciliated. 



Male. — The antennules (fig. 4) are very stout and genic- 

 ulated as usual in this genus, the feet much the same as in 

 the female, except that the usual slender setae of the outer 

 branches in the second and third pairs are replaced by stout 

 spines (figs. 7, 8). Length •46 mm. 



I took this species plentifully in brackish pools a little above 

 high-water mark at Dundrum, county Down, in September, 

 1900; also a few years earlier on the muddy sides of the Glen 

 Estuary, west coast of Donegal. 



Genus DACTYLOPUS. 



Dactylopus platycheles, sp. nov. (PI. III., figs. i-io). 



Female. — In general aspect like D. tisboides (fig. i). An- 

 tennules very short and rather stout, nine-jointed, first three 

 joints subequal, longer than the rest, but not much longer 



