2 Messrs. T. and A. Scott on some 



AnteniifB stout, three-jointed, middle joint considerably- 

 shorter than the first or third; no secondary branch (fig. 3). 

 Mandibles simple, lamelliform, tapering towards the rounded 

 ciliated apex and furnished with three stout plumose marginal 

 seta3 of unequal length (fig. 5). The raaxilla3 consist each of 

 an oblong lamelliform appendage, the extremity of which is 

 obliquely truncate, slightly rounded, and fringed with cilia 

 (fig. 6). Anterior foot-jaws simple, one-jointed, armed with 

 a stout elongate spine at the apex in addition to a smaller 

 spine on the inner margin (fig. 7). The posterior foot-jaws 

 form powerful grasping-organs ; they are each two-jointed, 

 with the joints short and very robust ; the end-joint terminates 

 in a broadly truncate extremity, to the posterior half of which 

 is articulated a strong slightly curved claw ; the anterior 

 angle is lengthened into a stout tooth-like process, against 

 which the claw impinges, as shown by the drawing (fig. 8). 

 The first and second pairs of feet are somewhat similar in 

 structure ; the outer branches are three-jointed and the inner 

 two-jointed ; the exterior distal angles of the first and second 

 joints of the outer branches are each furnished with a mode- 

 rately stout spine, while the third joint bears four spines round 

 the outer margin and apex and three long plumose setaj on 

 the inner margin ; the second joint of the inner branches 

 bears three plumose set« round the inner margin and apex 

 and a small apical spine ; a long plumose seta also springs 

 from the inner margin of the first joint ; the outer branches 

 are only slightly more elongate than the inner branches 

 (fig. 9). The third and fourth pairs of feet are also nearly 

 alike in structure, but difi'er considerably from the first and 

 second pairs ; each of the third and fourth pairs is composed 

 of a three-jointed outer branch and an almost obsolete one- 

 jointed inner branch ; the small rudimentary joint of which 

 the inner joint consists possesses apparently neither seta nor 

 spine (fig. 10). Fifth pair large and prominent and com- 

 posed of a single two-jointed branch ; the end-joint, which is 

 much shorter than the other, is furnished with three mode- 

 rately stout and plumose terminal seta, the middle one being 

 considerably longer than the other two (fig. 11). Caudal 

 stylets equal to about half the length of the last abdominal 

 segment (fig. 12). 



Habitat. Ayr Bay, Firth of Clyde. Among trawl-refuse; 

 one specimen. 



Remarks. Though the species now described was obtained 

 among some trawl-refuse unattached to any other organism, 

 it is apparently a parasitic form of some kind ; the structure 

 of the antennse and the simple form of the mandibles and 



