neio and rare Crustacea f rum Scotland. 4G1 



are slender ; tlie outer branches are elongate and strongly 

 8pin.itVrous ; the second joint is rather shorter than the first 

 and only two thirds the length ot" the last joint ; the two- 

 jointed inner branch does not reach to the end of the second 

 joint of the outer branch ; the first joint is ratiier stouter than, 

 but little more than half the length of, the second joint; the 

 second joint bears four seta? — the two apical and one of the 

 marginal are very long, but the other is short (fig. 7). The 

 third and fourth pairs are also slender and with short inner 

 brancht's ; in the fourth j)air the first joint of the inner 

 branches, which only reach to about the middle of the second 

 joint of the outer branches, is so short as to be almost rudi- 

 mentary (fig. 8). In the fifth pair the inner produced portion 

 of the basal joint is somewhat cone-shaped and bears three 

 moderately long and stout |)lumose setaj on the inner margin 

 and two smaller seta? at the apex ; the apex of the basal joint 

 only reaches to about half the length of tiie secondary joint ; 

 the secondary branch is elongate-ovate in form, being nearly 

 three times longer than broad ; the apex is lengthened into a 

 narrow process, from the end of which springs a moderately 

 long seta ; on each side of this there is a subaplcal seta, also 

 of moderate length, while three other setje spring from the 

 distal half of the outer margin (fig. D). Caudal stylets 

 narrow and about equal in length to the last abdominal 

 segment. 



Habitat. Port Erin, Isle of Man ; and near the mouth of 

 the Kiver Alness, Cromarty Firth ; rather rare. 



Remarks. This Laoyhonte has a superficial resemblance to 

 L. denticornis^ T. Scott, but on closer examination it was 

 found to differ very markedly, not only from that species, but 

 from any other Laophonte known to us. 



Idya longicornisj sp. n. (PI. XVII. figs. 10-17.) 



Description of the Species. — Female. Length 1*7 niillim. 

 (i^ of an inch). This form resembles Idya f areata^ Philippi, 

 in general appearance, but is larger. The antenimles, which 

 are eight-jointed, are very long and slender; tlie first four 

 joints are elongate, especially the third and foiu-th, which are 

 nearly of equally length, the fourth being slightly longer than 

 the other ; it is also longer than all the last four taken 

 together. The formula shows the proportional lengths of all 

 the joints — 



Proportional lengths of the joints. . 3 . 40 . 4 5 . 47 . 7 . 10 . 8 . 18 

 Number of the joints 1 '1 3 4 •'S 6 7 8 ' 



