CEREBRATULUS ANGULATUS. 195 



in front. Eyes obscure. Proboscis with a cross of fibres at each pole in transverse 

 section. 



Cerebratulus angulatus, 0. F. Muller, 1774. 

 Specific character.— Snout pointed. Body much flattened, brownish. 



Synonyms. 



1774. Fasciola angulata, O. F. Muller. Verm. Terrest. et Fluv., vol. i, part ii, p. 58. 

 1776. Planaria angulata, Ibid. Zool. Danic. Prodr., p. 221, No. 2680. 

 1780. „ „ O. Fabricius. Faun. Greenland., p. 323, No. 303. 



1788. „ „ Gmelin. Lin. Syst. Nat., p. 3088, No. 9. 



1798. „ „ O. Fabricius. Skriv. af Naturhist. Selskabet, 4 te Bind, 2 det hefte, p. 52, &c, 



tab. ii, f. 1—7. 



1844. Cerebratulus ? angulatus, CErsted. Entw. Plattw., p. 94. 



1845. Serpentaria fragilis, H. Goodsir. Ann. Nat. Hist., vol. xv, p. 377, pi. 20, f. 1 and 2. 

 1850. Meckelia serpentaria, Diesing. Systema Helm., vol. i, p. 266. 



1853. Gordius fragilis, Dalyell. Pow. Creat., vol. ii, p. 55, pis. 6, 7, and 7 (bis). 



1857. Lineus Beattim, J. E. Gray. Proceed. Zool. Soc, pt. xxv, p. 210, pi. 48. 



1858. „ longissimus, W. Beattie. Op. cit., pt. xxvi, p. 307. 



1859. Meckelia serpentaria, Leuckart. Archiv fur Naturges., ii, p. 187. 

 „ Lineus longissimus, Beattie. Ann. Nat. Hist., 3rd ser., iii, p. 160. 



1862. Meckelia serpentaria, Diesing. Bevis. der Turbell., p. 281. 

 „ „ Beatticei, Ibid. Op. cit., p. 285. 



1863. „ olivacea (Ratlike), Diesing. Nachtrage z. Hevis. der Turbell., p. 8. 

 1865. Serpentaria fragilis, Johnston. Catalogue Brit. Mus., p. 28. 



Habitat. — Generally in deep water throughout the British coasts. Greenland. 



Body. — Fifteen inches to three feet long, and about an inch in breadth ; flattened, bluntly and 

 rather suddenly tapered in front, more gradually posteriorly, and thinned at the margins all 

 round, so that a transverse section of the contracted body is elliptical. 



Colour. — Universally gray, darker on the dorsal, paler on the ventral surface, and with a pale 

 margin. Sir J. Dalyell's figure has a brown stripe commencing at the anterior third, and conti- 

 nuing to the tip of the tail, and the divisions of the alimentary organ are indicated inferiorly, but 

 of course we must be cautious in making deductions therefrom. This author also observes that 

 in one of his specimens a portion of the edge was reddish, a colour in all probability due to the 

 nerve-trunk and its surroundings. Mr. Goodsir states that his example was of a slate-blue colour, 

 with a yellowish edge. 



Head. — Tapered to a blunt snout in front, with a cephalic fissure on each side, and apparently 

 without eye-specks. Mouth forming a large slit on the ventral surface in the usual position. 



I have referred this species to the Planaria angulata of 0. F. Muller, from a careful con- 

 sideration of all the circumstances connected with its history, including the examination of several 

 examples from the north sea, and named by northern naturalists. Muller's account of its size, 

 the pointed nature of its snout, its colour and other points, can scarcely apply to any other 

 species \ and in the preparations the flattened body, thinned edges, and the structure of the 



