1868.] DR. W. BAIRD ON THE GEPHYREA. , 113 



Tkalassema ffrohmannijD'iesing, Rsvis. derRhyngod. p. 773,1859 ; 

 Quatrcfa^es /. c. p. 596, 1865. 



Ilab. Sea at Palermo (Grohmann). 



7. Thalassema pelzelnii. 



Thafassemapelzelnii, J)iesmg,Icon. Zoogr. Ferdinand. I. Imperat. ; 

 Revis. d. Rhyng. /. c. p. 774, 1859; Quatrefages, I.e. ii. p. 596, 

 1865. 



Had. West Indies (Biesing). 



8. Thalassema erythrogrammon. 



Ochetostoma erythrogrammon, Leuckart & Riippell, Atlas z. Reise 

 im nordl. Afiic. Zoophytes, p. 7, t. 2. f. 3, 1828. 



Ochetostomum erythrogrammon, Diesing, Syst. Helm. ii. p. 72, 

 1851. 



Thalassema erythrogrammon, Max Miiller, Obs. Anat. Verm. Ma- 

 rit. p. 16, 1852; Joh. Muller, Miill. Arch. 18.54, p. 97; Diesing, 

 Revis. d. Rhyng. I. c. p. 774, 1859 ; Quatrefages, I.e. ii. p. 599, 

 1865. 



Hab. Red Sea {Riippell). 



Genus 2. Ronellia. 



Bonellia, Rolando, Cuvier, Blainville, Edwards, Schmarda, Lacaze 

 Duthiers, Diesing, Quatrefages, &c. 



1. Bonellia viRiDis. 



Bonellia viridis, Rolando, Mem. d. Reale Ac. d. Sc. di Torino, 

 tom. xxvi. pp. 539-556, t. 14. f. 1-3, t. 15. f. 5-7, 1822; Isis, 

 1823, pp. 398-403, t. 5 ; Blainville, Diet. Sc. Nat. art. Vers, p. 576, 

 Atlas, t. 38. f. 1, \a-\d, 1828 (copied from Rolando) ; Cuvier, 

 Regn. Anim. 2nd edit. tom. iii. p. 244, 1830; Dujardin, in Lamk. 

 A. s. Vert. 2nd edit. tom. iii. p, 471, 1840 ; 1 Guerin, Icon. Zooph. 

 t. 6. f. 1; Edwards, Regn. An. edit. Crochard, t. 21. f. 3, ? 1840; 

 Diesing, Syst. Helminth, ii. p. 74, 1851 ; Revis. Rhyngod. p. 771, 

 1859 ; Schmarda, Denkschrift. der Ak. der Wiss. in Wien, tom. iv. 

 pp. 117-126, t. 4-7, 1852; (Ersted, in Kroy. Tidss. torn. iv. p. 579; 

 Lacaze Duthiers, Ann. Sc. Nat. 4th ser. tom. x. pp. 49, 110, t. 1. 

 f. 1, 2, t. 2 (anatomy), 1858; Quatrefages, Hist. Anneles, tom. ii. 

 pt. 2. p. 597, 1865. 



Hab. Mediterranean {Rolando). 



2. Bonellia fuliginosa. 



Bonellia fuliginosa,Ro]An(\o, /.c. p.552, 1. 15. f. 4, 1822; Dujardin, 

 in Lamk. A. s. Vert. 2nd ed. tom. iii. p. 4/1 ; Diesing, Syst. Helm. 

 p. 75, 1851 ; Revis. d. Rhyng. p. 771, 1859; Quatrefages, I. c. 

 p. 598, 1865. 



Bonellia viridis juvenilis, Blainville, Diet. Sc. Nat. torn. Ivii. p._576, 

 Atlas, Apodes, t. 1. 6, 1628 (y?<^e Diesing). 



Hab. Coast of Sardinia {Rolando). 

 Proc. Zool. Soc— 1868, No. VIII. 



