256 Part III. — Tenth Annual Report 



is prominent and has the apex somewhat tri-lobed ; the middle lobe 

 projects forward considerably beyond the lateral ones. 



It has been obtained from various parts of Great Britain. The. following 

 are some of the localities — Off the Island of Cumbrae ; at Portincross, 

 Ayrshire ; Mulroy Loch, Donegal (G. S. Brady) ; Oban (A. M. Norman) ; 

 East Loch Tarbert, Loch Fyne (Mihi). Laophonte horrida, so far as I 

 have been able to know its habits, is no swimmer, but appears to frequent 

 the muddy roots of weed and zoophytes, among which it crawls and finds 

 food and shelter ; it is usually more or less coated with mud. 



Laophonte inopinata* n. sp. (provisional name). (PL XL figs. 1-12.) 



Female. — Length, exclusive of caudal setae,, # 5 mm. Viewed dorsally, 

 the body is elongate and becoming gradually narrower posteriorly, com- 

 posed of ten segments, the first segment about as long as the next three 

 together, and furnished with a few small spinous setae at the antero- 

 lateral angles. Rostrum short, obtuse. Anterior antennae short and stout, 

 six-jointed, the first three joints large, subequal, the fourth and fifth small. 

 The proportional length of the joints are as in the annexed formula 



7 '8 '7 • 2 -2 • 6 ' 

 1 -2 • 3 ' 4 -5 • 6 



The fourth joint produced on one side to form the base of an elongate 

 olfactory filament. Posterior antennae stout, three-jointed, with four long 

 geniculated terminal setae and one short curved terminal spine. The 

 margin of the last joint is also fringed with short hairs and provided 

 with a spine near the distal end. The secondary branch, which springs 

 from near the middle of the second segment of the primary branch, is 

 small, one-jointed, furnished with one marginal and three short, plumose 

 terminal setae. Anterior foot-jaw small, two-jointed, armed with a 

 terminal clawed spine and two elongate marginal lobes. Posterior foot- 

 jaw two-jointed, and bearing a long terminal claw. The first pair of 

 swimming feet nearly as in L. similis, The second, third, and fourth 

 pairs nearly alike, moderately stout ; fifth pair small. The basal joint is 

 furnished with several small marginal hairs, a moderately long plumose 

 terminal hair, and three subterminal, spinous setae toothed near the 

 extremity; the second joint small and provided with one long and four 

 short terminal hairs. Caudal stylets short, each with a long curved, 

 spreading terminal seta, beset for two-thirds of its length with numerous 

 wooly-like curled filaments ; a short terminal seta plumose on one 

 side ; and a few very short hairs. The integument is thickly covered 

 with minute hairs, and the posterior margins of the body segments are, 

 besides being fringed with cilia, furnished with a number of small hairs 

 placed at regular intervals along the margin of each segment as shown in 

 the enlarged figure. 



Male. — The chief difference between the female and male is in the 

 form of the anterior antennae, which in the latter are distinctly hinged, 

 and constitute powerful grasping organs. 



Habitat. — Washed from a large seaweed root brought up in the trawl- 

 net a few miles west of May Island. Several £ and $ specimens were 

 obtained; some of the latter carried ovisacs. The long, spreading, and 

 neatly curved caudal setae serve to distinguish this species at a glance, 

 and especially so when examined under the microscope ; the wooly-like 

 curled filaments with which they are covered give them a very striking 

 character. 



* Inopinata, unexpected. 



