5S ODONTOSTOMUS. 



of Spix. Auricula fuscagula. LEA, Trans. Amer. Philos. Soc. 

 ( N. S.), v, p. 83, pi. 19, f. 7G ; Obs. Genus Unio i, p. 15, pi. 19, f. 

 7(5. BiiUmus fuscagula ORB., Voyage, p. 318 (description only, not 



the figures) Otostonms fuscaguhis BECK, Index Moll. p. 54 



Pupa septemplicata v. Muhlfeldt, ROSSMAESLER, Iconographie der 

 Land- tuul Siisswasser-Mollusken, v Heft, p. 8, pi. 23, f. 303 (1837). 

 I'mlinius spptempdcatus PFR., Symbolic i, p 85. Bulimus den- 

 tatus KING, Zool. Journ. v, p. 340 (1830 or 1831). 



(). punctatissimus is very closely related to O.fusiformis, but tlie 

 basal keel is shorter and more median in position, the sculpture is 

 less coarse, it generally has more teeth, and wants the dark girdle at 

 the periphery, usual in fusiformis. 



The typical form of the species (pi. 10, figs. 38, 39), t'mni Santa 

 Catharina island, seems to have little or no colored cuticle, being 

 either denuded or albino ; the descriptions and figures given by 

 Lesson, King and Lea all pertaining to this form. King's descrip- 

 tion probably appeared nearly as early as Lesson's, but it is less than 

 two lines long, and quite insufficient. 



The fold on the outer lip below the lower palatal seems to be in- 

 differently present or (as in Rossmassler's figure) wanting; though 

 in the majority of specimens before me it exists. The angular 

 lamella is equally variable, but its presence or absence is not always 

 correlated with that of the lower lip-fold. 



Specimens from the Province of Sao Paulo sent by Dr. von 

 Ihering, are larger than those from Sta. Catharina, dull brown with 

 cream- white variegation in the form of irregular and ragged streaks 

 and lines, sometimes reticulating, or with many fine spiral hair-lines 

 also. Fine spiral stria? are conspicuous on the last whorl, though 

 rather superficial. Whorls 8 to 9. The broad lip is bright rose 

 colored; folds and lamellae 8, there being no angular lamella. The 

 early whorls are not rose-tinted, as in the typical form. Two speci- 

 mens measure: Length 29, diam. 8 and 9, aperture 11 mill. The 

 stouter one has white spiral lines, and is from Jguape (pi. 10, fig. 41). 



Section CYCLODONTINA Beck, 1837. 



Cyclodontina BECK, Index Molluscorum p. 88, in part. PILSBUY, 

 Nautilus xii, p. 57, type pupoides Spix, inflatus "\Vagn. 



Species with the umbilicus noticeably excavated, aperture ob- 

 structed by numerous lamellae and folds, the columellar lamella 



