TON JHERING : ON SOUTH AMERICAN MYTILID.E. 95 



; This Chilian species occurs in the Magellanic region and on the 

 ; Atlantic side at St. Cruz. I believe the South African M. variabilis, 

 ■ Krauss, to be the same. 



Genus MODIOLUS, Lam. 



Subgen. EUMODIOLTTS. 

 t 



12. Modiolus tulipa, Lam. 



Modiola tulipa, Lamarck: Anim. sans Vert., vol. vi (1819), p. 111. 

 ,, ,, Lam. : Reeve, Conch. Icon., vol. x (1858), figs. 5 



and 15. 

 ,, albicosta, Lam. : Reeve, t.c, fig. 7. 

 1 I/t/tilus Americanus, Favart d'Herbigny : Orbigny, in Sagra's Hist. 

 ■ nat. Cuba, Moll., vol. ii [1846 ?], p. 329. 



Modiola capax, Conrad : Dunker {nee Conrad), Jahrb. Deutsch. Malak, 

 Ges., Bd. ii (1875), p. 252. 

 L ,, albicosta, Lam. : Clessin, Conch. -Cab., 2nd ed., p. 96 (1887), 

 pi. v, fig. 5. 

 ,, tulipa, Lam. : Jhering, Rev. Mus. Paulista, vol. ii (1897), 

 p. 103. 



Of this well - known species I have examples from the coast of 

 S. Paulo and Bahia, and Dunker obtained it fi'oin St. Catharina. 

 If. capax, which Dunker believed to be the same, is a Pacific variety 

 of M. modiolus. Clessin has not given a good figure of this species, 

 his pi. xxxii. figs. 1, 2, referring to M. modiolus, and pi. v, fig. 4, 

 to If. auriculatus, Krauss. I cannot form any idea as to the relation- 

 ship of this species to M. albicostus, Lam. I have received from the 

 West Indies as M. Americanus, Fav. d'Herb., a smaller, slender form, 

 with concentric grooves and striae, which has the ligament much 

 longer than If. tulipa. 



I observe that Modiolus modiolus, Linn., does not occur on the 

 Brazilian coasts. 



13. Modiolus Brasiliensis, Chem. 



< Ifytilus Guyanensis, Orbigny: Voy. Arner. merid., torn, v [1846], 

 p. 644. 

 Modiola Brasiliensis, Chem. : Reeve, Conch. Icon., vol. x (1858), 

 figs. 1 7 and 3 1 . 

 ,, ,, Chem.: Clessin, Conch. -Cab., 2nd ed., p 110 



(1887), pi. i, figs. 7-8^ ; pi. xxvi, figs. 6, 7. 

 ,, ,, Chem.: Hidalgo, Mol. Viaj. Paeifico, pt. ii (1869), 



p. 56, pi. iii, fig. 7. 

 ,, ,, Chem. : Jhering, Rev. Mus. Paulista, vol. ii 



(1897), p. 102, fig. 5. 

 ,, sinuosa, King: Zool. Journ., vol. v (1831), p. 337 (Santos). 

 VOL. iv. — august, 1900. 7 



