40 



BRITISH TUNICA.TA. 



FIG. 107. Individuals of Distomarubrum. Much enlarged. (Savigny, 

 pi. xiii, ff. 1 4 ' s - 9 .) . An individual seen from the right side; with 

 branchial aperture further enlarged. 6. Another individual differ- 

 ing in the forward bend of the intestine and the curvature of the 

 peduncle of the abdomen, c. The same reversed. B, branchial 

 aperture ; b, oesophagus ; C, atrial aperture ; c, csecum of the 

 stomach ; d, intestine ; d, swelling of the intestine near the pylorus ; 

 e, prolongation of the mantle in the base of the test, or in its 

 peduncle; H, anal aperture ; h, anterior (branchial) tubercle; K, 

 ovary ; k, posterior tubercle ; 1, dorsal lamina ; t, an isolated germ 

 being protruded from the anal aperture. 



[2. Distoma variolosum (G-aertner) Savigny.] 

 (Plate XL VI, figs. 12-14, and fig. 108 in text.) 



[Distomus variolosus G-AERTNER in Pallas' Spicil. Zool. I, 

 fasc. 10 (1774), pp. 35, 40, pi. iv, ff. 7, 7 a; OLIVI in 

 Opusc. scelti Scienze, XVI (1793), p. 248 ; SAVIGNY Mem. 

 Anim. sans Vert. pt. 2 (1816)., p. 38 ; LAMARCK Hist. nat. 

 Anim s. Vert. Ill (1816), p. 101, and ed. 2,111 (1840), p. 

 498; DELLE CHIAJE Mem. Anim. senza Vert. Ill (1828), 

 pp. 86, 94; STARK Elem. Nat. Hist. (1828), II, p. 120. 



