APPENDIX. 339 



sevenths to three-elevenths the total length, moderately ob- 

 lique, rhombic-pirif orm ; peristome thin, the columellar mar- 

 gin slightly arcuate, very obliquely truncate, parietal callus 

 distinct. Length 26, diam. 7.5 mm., aperture 7 mm. long, 

 3.5 wide (Marts.). 



West Africa: Cameroons at Bonjongo (Buchholz), Bi- 

 bundi, Bonge, Buea and Barombi (Sjostedt et al.) . 



Stenogyra pileata MARTENS, Monateber. K. P. Akad. Wis- 

 sensch. zu Berlin, 1876, p. 261, pi. 3, f . 12, 13 ; Sitzungsber. 

 Ges. naturf. Freunde, 1891, p. 31. Homorus pileatus D'AILLY, 

 Bihang, etc., p. 110. 



Distinguished by the first two whorls, which give the 

 upper end a cap-like aspect, and in this respect resembling 

 S. calabarica; otherwise with the appearance of S. vivipara 

 (Marts.). 



D 'Ailly reports a specimen from Bonge 33.5 mm. long with 

 11 whorls. The eggs, according to the same author, are 

 nearly spherical, 2 mm. in diameter. The apical sculpture is 

 that of Pseudoglessula, but d' Ailly removes it to Homorus on 

 account -of the color of the shell and the shape of the eggs. 



EUONYMA NATALENSIS (Bumup). PL 31, figS. 12, 13. 



The original description may be found on p. 41. Speci- 

 mens in the collection of the Academy, overlooked until re- 

 cently, show that the shells described by Mr. Burnup are im- 

 mature. It attains a large size, being in fact the largest of 

 the genus. It is pale straw-colored, solid though rather thin, 

 and has a beautiful silky luster produced by very fine and 

 closely crowded but distinct striae, which arch forward rather 

 strongly below the suture. The columella is straight in the 

 stouter examples, concave in the slender one, and its reflexed 

 edge leaves a narrow umbilical crevice. The specimen 

 drawn in fig. 13 has lost several whorls, but fig. 12 has lost 

 only one or less ; so that the count of whorls in entire exam- 

 ples would be greater than given below. It is evident, how- 

 ever, that self-amputation is habitual in the adult stage. All 

 have the breach closed by a long septum. 



Length 51, diam. 13.5, aperture 15.1 mm. ; whorls 9. 



