LICHOMOLGUS. 43 



being proportionately long and slender ; the inner 

 branch 2-jointed, scarcely exceeding in length the 

 first joint of the outer branch, and bearing only two setae 

 at the apex of the second joint. Fifth pair of feet (fig. 

 10 a), alike in both sexes, composed of a single long 

 curved joint with two apical setse. The caudal seg- 

 ments are parallel, subcylindrical, about thrice as long 

 as broad, and equal in length to the last two abdominal 

 segments ; the setae are four on each segment, two 

 short, lateral or subapical, and two apical, which are 

 much longer, the innermost of the two being equal to 

 about two thirds the length of the abdomen; these 

 longer setae are jointed and suddenly constricted in 

 the middle. The colour of the animal is usually a deep 

 brown, but varies with habitat. Length of the male 

 -^g-th of an inch (1 mm.), of the female -^th of an inch 

 (1-3 mm.). 



LicJiomolgus fucicolus inhabits chiefly the littoral 

 and Laminarian zones, but occurs not unfrequently in 

 greater depths ; it is a very well marked and, in the 

 British seas at least, a widely distributed species, as will 

 be evident from the following list of localities in which 

 I have taken it : Amongst fuci, near low water-mark, 

 on the coasts of Northumberland and Durham (St. 

 Mary's Island and Ryhope), at the end of summer; 

 dredged four miles off Hawthorn and Marsden 

 (Durham), amongst rough shelly sand, in a depth of 

 about twenty-five fathoms; off the Yorkshire coast 

 near Scarborough, Robin Hood's Bay, and Red Cliff, in 

 depths of about thirty-five fathoms ; amongst weeds at 

 Clifden, Roundstone, and "Westport (Ireland) ; and in 



