The annals and magazine of natural history : zoology, botany, and geology . d in twoof tliem a single cyst was lound. In both cases it was looselyattached to the inner side of the mantle-edge, projecting intothe mantle-cavity. The cysts are spherical, about S mm. in diameter and havea thin, opaque, membranous wall. The liberated ceicaria is6 mm. long and of somewhat elongated oval outline. It iscolourless and very transparent, so that little of its internalanatomy could be made out. The suckers are both globular, * Trematodes of the Northumberland Coast: II., p. 10, pi. 8,9, iti Trans.
The annals and magazine of natural history : zoology, botany, and geology . d in twoof tliem a single cyst was lound. In both cases it was looselyattached to the inner side of the mantle-edge, projecting intothe mantle-cavity. The cysts are spherical, about S mm. in diameter and havea thin, opaque, membranous wall. The liberated ceicaria is6 mm. long and of somewhat elongated oval outline. It iscolourless and very transparent, so that little of its internalanatomy could be made out. The suckers are both globular, * Trematodes of the Northumberland Coast: II., p. 10, pi. 8,9, iti Trans. Nat. Soc. Northumberland, New Series, ii. part Lvc. cit. pi, i, figs. 6, 7. 242 Dr. W. NIcoll and Mr. W. Small on the oral having a diameter of 120 mm. and the ventral•152 mm.; the latter is situated at the beginning of theposterior third of the body. The cuticle is smooth andwithout spines. Just behind the ventral sucker two smalloval testes are placed, one on each side, with their long axesdirected obliquely outwards and forwards. The ovary could liiT. Vei carta limcB. not be distinguished, being ])robably concealed by the ventralsucker. A short excretory vesicle lies at the posterior end ofthe body. There is a small pharynx contiguous with theoial sucker; two simple intestinal diverticula arise im-mediately behind the pharynx and appear to terminate nearthe testes. This is apparently the first record of this cercaria, andno other entozoa have hitherto been described from LimaMans. Even with the scanty details given above, it is not difficultto recognize in this cercaria the larva of a species belongingto one or other of the genera Steringophoriis or position of the suckers, their large size and particularlythe prominence of the ventral sucker, the situation of thetestes, and the smooth condition of the cuticle all supportsuch an identification. The characters of the excretoryvesicle and the alimentary system are also of
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Keywords: ., bookcentury1800, bookdec, booksubjectnaturalhistory, bookyear1838
