MYCETOPODA 1463 



Mycetopoda weddclli \'on Iiikring, Abh. Senckenb. Ges., 



XXXII, 1910, p. 1 [9. 



An exceedingly thin, delicate species, which sometimes has 

 a form much Hke specimens of .1/. siliquosa, but it is always 

 smaller and more fragile. The finely reticulate epidermis on 

 the dorsal slope is a good distinguishing character. Von Iher- 

 ing believes this to be the young of M. siliquosa, but it differs 

 in the character of the epidermis, texture and form from young 

 siliquosa that I have seen. 



Von Ihering, (1. c), considers tveddellii specifically distinct 

 from pygmcpa. 



Mycetopoda hupeana (ClessinK 



Shell small, thin, subtrapezoid, somewhat inequilateral ; 

 greenish-tinted or olive-green; beaks full, moderately elevated; 

 hinge line straight ; anterior end narrowed, rounded, cut away 

 belov/ ; base line nearly straight, a little fuller behind the mid- 

 dle ; posterior end almost squarely subtruncate. 



Length 54, height 21 mm. 



Brazil. 

 Mycctopus pygnucHS Hupe, Moll. Nouv., Ill, 1857, p. 93, pi. 



XIX, fig. 2. 

 Mycetopiis hupeanus Clessin, Conch. Cab. Ano., 1875, p. 206, 



pi. Lxvi, fig. 15. 

 Mycetopoda hupeana Simpson, Syn., 1900, p. 935. — von Iher- 

 ing, Abh. Senck. Ges.. XXXII, 1910, p. 119. 



This may be only a variety of siliquosa, but the beaks are 

 more central than in any specimens of that species I have seen. 

 It is higher in proportion to its length than M. pygmcva, and 

 less inequilateral. 



Von Ihering, (1. c), refers Sowerby's figure of M. pygm<ra, 

 (pi. II, fig. 4), to this species. 



Mycetopoda bahia von Ihering. 



"A fragile, transparent shell, which gapes comparatively 

 little in front. The diameter increases rapidly from the ante- 

 rior margin as far as the beaks, then gradually to the middle 

 of the shell, whence it gradually slopes to the hinder end. 



