L.M.B.C. NEMEKTIDA. 139 



surface, and flesh coloured on the ventral surface. A very 

 pale variety was obtained from " The Clets," having the 

 dorsum of a flesh tint with scattered brown granules. 



Order IV.— HETEKONEMEKTINI, Burger. 



Family LiNEiDiE, MTntosh. 



Linens obscuncs, Desor ( = L. gesserensis, auct.). 



Average length 7 cm. This is by far the most abundant 

 species of Nemertine at Port Erin and also at Poyllvaaish, 

 and is found under stones along with Amphiporus lacti- 

 floreus. The colour varieties met with are the dark olive 

 green and the dark red, with pale ventral surfaces, and 

 the pale green form with red at anterior end as figured 

 by M'Intosh. The head is wider than the body, and the 

 whitish lateral cephalic fissures are very conspicuous. 

 Near the jetty, flesh-coloured and dark green varieties 

 occur averaging in length from 2 to 3 centimetres. Lineus 

 obscurus lives well in captivity, seeking the waterline, 

 where it en sheaths itself in a transparent mucous invest- 

 ment. Some individuals had well developed gonads in 

 April. 



Lineus longissimus , Sowerby (=L. marimis, auct.). 



The length varies from a few centimetres to 2 or 3 feet. 

 It is found in low tide pools and in deep water all round 

 the coast. The three pale longitudinal bands on the 

 dorsal surface are usually very distinct, but in an individual 

 from Traie Veg, the dorsum was very black, and the 

 bands hardly noticeable. 



Gerebratidus angulatus (?), 0. F. Miiller. 



In April, 1893, a large pale nemertine was dredged off 

 Dalby, depth 25 fathoms. It broke up into many pieces 

 before it was got to the laboratory, but from the descrip- 

 tion given of its appearance and mode of swimming, it 

 was, most probably, referable to this genus and species. 



