748 DR WALTER E. COLLINGE. 



broadly rounded, posterior margin almost straight, with slight impressed line 

 anterior to the margin. Eyes large, situated dorso-laterally immediately behind 

 the lateral lobes. Antennulae (fig. 93) extending beyond the third peduncular joint 

 of the antennae, first joint comparatively small, second joint very small. Antennae 

 (figs. 94 and 95) large, with last two joints of peduncle nearly subequal, and each 

 nearly twice as long as the two preceding ones; fiagellum normally with twenty 

 joints, terminal style long, distally with dense brush of setae. First maxillae (fig. 96) 

 with outer lobe terminating obliquely truncate, with nine curved spines, inner lobe 

 terminating in three fine setose spines. The segments of the mesosome (fig. 100), 

 excepting the first, almost subequal, pleural plates small, coxal plates small, occupy- 

 ing the anterior portion of the lateral margin of segments 2 to 4, the middle 

 portion of the fifth segment, and the posterior portion of the sixth and seventh. 

 Maxillipedes (fig. 97) with four-jointed palp, groove on the third joint scarcely 

 visible, basal segment short and broad, inner distal lobe large, epipodite roughly oval. 

 Thoracic appendages (figs. 98 and 99) only moderately stout, protopodite of the 

 seventh deeply grooved. Metasome (fig. 101) has two short segments and indica- 

 tions of a coalesced third, terminal segment long, lateral margins slightly incurved 

 anteriorly, widening a little beyond the middle and contracting towards the posterior 

 margin, which is excavate with median obtuse point, and longer and more acutely 

 produced laterally. Uropoda (fig. 102) flattened, elongated, rounded and narrower 

 anteriorly, widening towards the joint, endopodite narrower than the terminal 

 margin of the basal plate, longer than the breadth, and slightly cut away on the 

 outer postero-lateral border. 



Length of 6 28-30 mm., of ? 25 mm. 



Colour (in alcohol) pale brownish-green, with darker-coloured longitudinal 

 stripes. 



Geographical Distribution. — Fairly common all round our coasts. I have 

 records from a large number of localities, amongst which the following may 

 be mentioned : — Moray Firth, Aberdeen, St Andrews, Northumberland coast, 

 Norfolk and Suffolk coasts (very small examples), Weymouth, Plymouth, Bristol 

 Channel, Blacksod Bay (Co. Mayo), Irish Sea, and Firth of Clyde. I have examined 

 very fine specimens in the Cambridge University Museum of Zoology, measuring 

 38 mm. in length, from Lowestoft. Also recorded from Netherlands, Denmark, 

 Mediterranean, and Java (Miers) ; Channel Isles and coasts of France and Spain 

 (Norman). 



Remarks. — /. linearis stands out distinct from any other species of the family 

 occurring in the British Isles. Its long filiform body, graceful antennae, and small 

 coxal plates at once serve to identify it. 



