D1DKMNUM CANDIDUM. 



position, that is at right angles with the thorax and 

 connecting peduncle, and its form is elliptic. The 

 ovary is orbicular and lies on the left side of the 

 abdomen.] 



FIG. 105. Individuals of Di<lemnuui /-it miiil nni. Enlarged. (Savigny,* 

 pi. xx, ff. 1 2 ~ 4 .) a. Details of an individual seen from the right 

 side, much enlarged, b. Another individual deprived of its thorax 

 and less enlarged than the preceding ; its intestine and ovary 

 differently disposed. Seen from the left side. c. The same re- 

 versed. B, branchial aperture ; C, mantle ; C, atrial aperture ; 

 c, stomach; d, intestine; h, anterior (branchial) tubercle; A", 

 ovary ; k, excrement contained in the intestine ; 1, dorsal lamina. 



//. Botli, api' 

 Genus 20. DISTOMA Savigny, 1816. 



(DISTOMUS Gaertner, 1774.) 



Distomus GAERTNEK in Pallas' [Spicil. Zool. I, fasc. 10 

 (1774), p. 35; LAMARCK Hist. nat. Aniin. s. Vert. Ill 

 (1816), p. 100, and ed. 2, III (1840), p. 497; WOODWARD 

 Man. Moll. pt. 3 (1856), p. 342;] H. & A. ADAMS Gen. 

 Recent Moll. II [1858], p. 603. 



Distoma SAVIGNY Mem. Aiiim. sans Vert. pt. 2 [1816], 

 p. 176; [LAMOUROUX Kxp. metli. Polyp. (1821), p. 72 ;] 

 FORBES & HANLEY Brit. Moll. I [1848], p. 18. 



Diazona FLEMING Brit. Anim. [182S], p. 469. 



Distomnui M. SARS [in Nyt Mag. f. Naturvid. VI (1851), 

 p. 154]. 



* All the figures after Savigny are copied from his ' Mt'moires,' pt. '2 

 (1816). 



