DALYELLIDiE. 13 



Obs, The mouth is apparently helow, under the eyes. The motion 

 is swift ; and the creature can swim in the water. 



Planaria falcata, body flattened, thick and fleshy, linear-elongate, 

 rounded and equal at both ends ; eyes two, lateral, red. Length 

 1-2'". 



Planaria falcata, Daly ell, Pow. Great, ii. 117. pi. 16. f. 26-29. 



Hab. Lochend in autumn, Daly ell. 



Obs. "Two red crescents apart on the extremity of the head, in 

 a circular position, but under considerable magnifiers, appearing red 

 streaks, sometimes consisting of one or two confluent pair indistinctly 

 seen. The mouth seems in front ; and the intestine a longitudinal 

 series of cavities, with some enlargement in their course. Crawls on 

 the belly, or swims swiftly through the water." — Dalyell. 



Fam. III. DALYELLID^. 



Rhabdoccela, Oersted, Entw. Plattw. 59. Ray Soc. Zool, Rep. 



1847, 518. Schultze, Naturg. Turbell. 5. 

 Gyratricinea, Diesing, Syst. Helm. i. 218. 

 Obs. An artificial group, but associated by a general resemblance 

 in form, and by similarity in habits. They are small animals, of a 

 parenchymatous consistency, in which it is often difiicult to trace 

 any distinctly defined viscera, or their openings on the surface. The 

 body is acephalous, and more or less contractile, with an entire 

 margin. They are either marine or lacustrine ; and the latter, in 

 general, lay their eggs enclosed in a cocoon or capsule. Of the mode 

 in which the marine genera are propagated, nothing appears to be 

 known. 



6. DALYELLIA. 



Dalyellia, Fleming, Phil. Zool. ii. 605 (1822). 

 Prostoma, Oersted, Entw. Plattw. 62. 



Char. Body somewhat compressed vertically, elliptical ; the mouth 

 terminal; eyes two, parallel, posterior to the mouth and dorsal. 

 Ova capsulated. Lacustrine. 



I . D. helluo, narrowed at both ends, most so posteriorly, of a uni- 

 form grass-green colour with a transparent margin; eyes black. 

 Length 1-H'". 



Fasciola helluo. Mull. Verm. i. ii. 64. 



Planaria helluo, Miill. Zool. Dan. Prod. no. 2692; Zool. Dan. iii. 39. 



tab. 105. f. 3. Turt. Gmel. iv. 65. Rose, Vers, i. 304. 

 Hirudo viridis, Shaw in Linn. Trans, i. 94. pi. 7. Johnson on Medic. 



Leech, 19. Rlainv. Diet, des Sc. nat. xlvii. 268. 

 Planaria viridis, Turt. Brit. Faun. 129. Stew. Elem. ii. 355. 

 Planaria graminea, Dalyell, Planar. 42. f. 8; Pow. Great, ii. 119. 

 Dalyellia graminea, Flem. Phil. Zool. ii. 605. Johnston in Ann. ^ 



Mag. Nat. Hist. xvi. 438. 



