22 TERETULARIA. 



tending to brown or pale carnation ; eyes six or more around the 

 anterior margin. Lengths^"; breadth 1'". 



Planai'ia gessercnsis, " elongata, viridis, pone caput rufa," MiilL Zool. 



Dan. ii. 32. tab. 64. f. 5-8. Turt. Gmel. iv. 67. Bosc, Vers, i. 308. 



Lam, An. s. Vert. iii. 179. 

 Notospermus gessercnsis, Dies. Syst. Helm. i. 260. 

 Gordius gessercnsis, Dalyell, Pow. Great, ii. 73. pi. 10. f. 5. 



Hab. *' Under stones on the shore," Dalyell. 



Obs. "A slit below indicates the mouth. Colour universally 

 different shades of green ; sometimes tending to brown or pale car- 

 nation. Numerous lighter narrow circles, at considerable intervals, 

 with a minute pale speck on the side of each, environ the body, 

 resembling faint annulations." Dalyell. — Oersted conjectures that 

 this species may be the same as our Borlasia olivacea (Entw. Plattw. 

 89). 



5. B. striata, black, with many parallel whitish or cream-coloured 

 lines extending from one extremity to the other. Length 1-4' ; 

 breadth 1'". 



Borlasia striata, Rathke in Nov. Act. Nat. Curios, xx. 231. 

 Nemertes striata. Oersted, Entw. Plattw. 92. Dies. Syst. Helm. i. 274. 



Hab. The littoral zone. 



Obs. The fragment in the collection is about 3 inches long. It 

 closely resembles Lineus longissimus. The eyes are in a line, on 

 a white space, on each side of the head, and are hence very visible. 

 There are seven pale lines on the dorsal surface, one on each side, 

 and three on the ventral surface. 



{a) Falmouth, W. C. Cocks. 



16. OMATOPLEA. 



Prostoma (— ), Duges in Ann. des Sc. nat. xxi. 74 (1830); and in 



Edin. Journ. Nat. Sf Geogr. Sc. iii. 379. 

 Nemertes, Johnston in Mag. Zool. 4* Bot. i. 534 (1837). 

 Prostoma, Johnston in Ann. Sf Mag. Nat. Hist. xvi. 436. 

 Polystemma, Oersted, Entw. Plattw. 92 (1844). 

 Omatoplea, Diesing, Syst. Helm. i. 248 (1850). 



Char. Body linear-elongate, contractile, somewhat compressed, 

 soft and even : head continuous with the body, indistinctly defined, 

 with or without a shallow fissure on each side, marked with two 

 approximate spots on the dorsal aspect, and with several eyes, scat- 

 tered or clustered : mouth terminal, the oesophagus armed with 

 horny stylettes : anus anterior ? 



1 . 0. gracilis, of a uniform olive colour, very long and linear, or a 

 little narrowed posteriorly ; eyes numerous, arranged on the margins 

 of the head. Length 20"; breadth I'". 



