DISTOMA VAIUULOSUM. 41 



Alcyonmm ascidioides PALLAS Spicil. Zool. I, fasc. 10 (1774), 

 pp. 35, 40; (IMKLIN Linnaei Syst. Nat. ed. 13, I, pt. 6 

 (1791), p. 3816; OLIVI Zool. Adriatica (1792), p. 236 ; 

 TURTON Gen. Syst. Nat. IV (1806), p. 656, and Brit, 

 Fauna, I (1807), p. 207 ; SAVIGNY Mem. Anim. sans Vert, 

 pt. 2 (1816), pp. 3, 26. 



Alcyoniiim dixtomum BRUGUJERE Hist. nat. Vers, I (1789), 

 p. 23, in Encycl. Metli. ; Bosc Hist. nat. Vers (1802), III, 

 p. 132, and ed. 2 (1827), III, p. 159; LAMOUROUX Hist. 

 Polyp. Corall. flex. (1816), p. 352, and (Engl. transl.) 

 Corallina (1824), p. 250. 



Dixtoma variolosum SAVIGNY Mem. Anim. sans Vert. pt. 2 

 (1816), pp. 38, 178; LAMOUROUX Exp.meth. Polyp. (1821), 

 p. 73 ; THOMPSON in Ann. Nat. Hist. (1) V (1840), p. 95; 

 DELLE CHIAJE Descriz. Anim. Invert. Ill (1841), p. 21, 

 pi. Ixxx, f. 12; THOMPSON in Rep. Brit. Assoc. for 1843 

 (1844), p. 264; FORBES & HANLEY Brit. Moll. I (1848), 

 p. 19 ; COCKS in Rep. R. Cornw. Polyt. Soc. for 1849 

 (1850); p. 74; NORMAN in Zoologist, XV (1857), p. 5707. 



Distoma variolosus OKEN Lelirb. Naturgesch. Ill, 1 (1815), 

 p. 83; FLEMING in Edinb. Encycl. XIV (1820), p. 631; 

 RANG Hist. nat. Moll. (1829), p" 353. 



Polyclinum variolosum CUVIER Regne Anim. (1817), II, 

 p. 501, and eel. 2, III (1830), p. 169; McMuRTBiB (Engl. 

 transl.) Cuvier's Anim. Kingd. Ill (1834), p. 115. 



Poli/zon a variolosa FLEMING Philos. Zool. (1822), II, p. 513, 

 and Brit. Anim. (1828), p. 469. 



Distoma variolatux BLAINVILLE Man. Malac. et Conch. (1825), 

 p. 585, and (1827), pi. Ixxxii, ff. 4, 4 a; McMuRTRiE 

 Cuvier's Anim. Kingd. (Engl. transl.),' Atlas, III (1837), 

 pi. xliii ter, f. 3. 



Distomus ascidioides OKKN Allgem. Naturgesch. V, 1 (1835), 

 pp. 93, 94. 



Polyzona variolosum FLEMING Moll. Anim. (1837), p. 211. 



Poli/clmmn variolosus DESHAYES in Cuvier's Regne Anim., 

 Moll. (dr. 1845), p. 245. 



Distomum variolosus HOEVEN Handb. Zool. (Engl. tranl.) 

 I (1856), p. 704. 



Thylacium rarieyatum ALDER in Ann. Nat. Hist. (3) XI 

 (1863), p. 168. 



Didemnium variolosum GTRUBE Insel Lussin Meeresf (1864), 

 p. 62, pi, f. 4.] 



[Colony (PI. XL VI, figs. 12, 13 ; and fig. 108, a, in 

 text) "coriaceous, not thick, flat beneath, warty above; 



