198 DR- W. E. COLLINGE ON 



It o-ives me much pleasure to associate the name of Dr. Stephensen with 

 this interesting species, and to express my thanks to him and the authorities 

 of the Zoological Museum of the University of Copenhagen, for their 

 kindness in forwarding to me the whole of this interesting collection. 



Idotea Stephenseni, n. sp. (Plate 23. figs. 1-12.) 



Body oblong, with sides nearly parallel, slightly convex ; surface finely 

 rugose. Cephalon (PI. 23. fig. 1) wider than long, anterior margin deeply 

 excavate with the lateral portions produced as sharp points in front of the 

 eyes ; lateral margins sloping inwards, posteriorly with deeply impressed 

 furrow. Eyes large and round, situated dorso-laterally. Antennulse (PI. 23. 

 fio-. 2) short, 1st joint expanded, articulating with the cephalon on the 

 ventral side of the 1st joint. Antennse (PI. 23. figs. 3, 4) elongated and 

 robust, nearly one-third the length of the body ; peduncular joints robust, 

 with short stiff sefcse ; flagellum with 11-12 joints and short style, excepting 

 the first four all the joints are elongated. First maxillse (PI. 23. fig. 5) 

 with outer lobe terminating in six stout curved spines and six finer inner 

 ones, setaceous on the inner side ; inner lobe with rounded head and three 

 lono- setose siDines, and a setule on the outer border of the distal end, 

 setaceous on the inner side. Maxillipedes (PI. 23. fig. 6) fairly long ; palp 

 4-jointed, with the 4th joint produced anteriorly and indented on the outer 

 maro-in ; epipodite oval, distal inner lobe wide, basal plate short. The first 

 four segments of the mesosome are almost subequal, also the last three ; 

 pleural plates of the 1st segment terminating in a blunt point, the anterior 

 and posterior angles being cut away. Coxal plates (PI. 23. fig. 7) occupying 

 the whole of the lateral margins of segments 2-7, the posterior angles are 

 drawn out as sharp points, which are directed laterally on segments 2-4 and 

 posteriorly on segments 5-7. The appendages of the mesosome (PI. 23. 

 fio-s. 8, 9) slender and elongated, with bilateral and unilateral dentate spines 

 on the sides (PI. 23. fig. 10), also stout plain spines. Metasome (PI. 23. 

 fio-. 11) with two short segments and strongly-marked lateral sutures indi- 

 catino- a third coalesced one, all laterally produced as sharp spines; terminal 

 segment strongly arched, lateral margins converging very slightly towards 

 the middle of their length, then expanded a little and curving to form two 

 faint rounded lateral points and a median indication of a third one. 

 Uropoda (PI. 23. fig. 12) elongated, flattened, with nearly parallel sides, 

 posterior margin slightly curved; endopodite almost straight on the inner 

 maro-in, showing a blunt point on the inner side of the posterior margin, 

 which is slightly emarginate, and with the outer margin cat awaj^ a little ; 

 setose style short. 



Length of cJ 31 mm., of ? 24*5 mm. 



