264 



Remarks. This form, described by Th. Scott in the above-mentioned paper, 

 is at once distinguished from any of the other known species by the peculiar 

 structure of the middle apical seta of the caudal rami. It also differs from most 

 other species in the poor development of the natatory legs, which would seem to 

 make it quite unable to move freely in the water. 



Occurrence. Only a very limited number of specimens of this form, all 

 of the female sex, have hitherto come under my notice. Some of them were found 

 off the south coast of Norway, at Bis0r and Lillesand, and some off the south-west 

 coast, at Skutesnses. Th. Scott also records this species from the Finmark coast. 



Distribution. Scottish coast (Scott). 



175. Laophonte denticornis, Scott. 



(PL CLXXXIV). 



Laophonte denticornis, Th. Scott, Additions to the Fauna of the Firth of Forth. Twelfth Annual 

 Report of the Fishery Board for Scotland, Part III, p. 246, PL VII, figs. 1323. 



Specific Characters. Female. Body very slender, cylindric in form, with 

 all the segments sharply marked off from each other, and more or less angular. 

 Rostral projection broadly triangular, with the tip narrowly produced. Urosome 

 fully as long as the anterior division, lateral expansions of the anterior segments 

 well defined and densely spinulose, last segment about the length of the preceding 

 one, and having the anal opercle triangularly produced. Caudal rami nearly 4 

 times as long as they are broad, linear in form, and somewhat divergent, each 

 with a well-marked keel running along the dorsal face; apical setae of moderate 

 length and distinctly spinulose. Anterior antenna rather large, but composed of 

 only 6 articulations, the last 2 being confluent; 2nd joint produced behind to a 

 remarkably strong claw-like projection. Posterior antenna? and oral parts of 

 normal structure. 1st pair of legs with the outer ramus very small, biarticulate, 

 scarcely more than 1 / 3 as long as the proximal joint of the inner. Natatory legs 

 poorly developed, with the seta much reduced, inner ramus in all pairs biarticulate 

 and finely ciliated on both edges. Last pair of legs with the distal joint narrow 

 oblong in form, and somewhat obliquely truncated at the end, which carries 5 

 somewhat unequal setae; inner expansion of proximal joint rather large, extend- 

 ing about as far as the distal joint, marginal setae 4 in number, all of nearly 

 equal length. 



Male not examined. 



Colour whitish grey. 



Length of adult female 0.80 mm. 



