THE TYPES OF THE LAMARCK COLLECTION IN THE MUSEUM OF GENEVA 969 



Lamarck's species is a synonym of Vexillum sanguisugum (Linnaeus, 1758), a 

 species which is widely distributed throughout the tropical Indo-Pacific. 



Mitra fissurata Lamarck, 1811 

 (Fig. 22) 



1798. Tabl. Encycl. Méth., pl. 371, figs. 1 a, b 



1811. Mitra fissurata Lamarck, Ann. Mus. d'Hist. Nat., 17:209, No. 34 

 1822. Mitra fissurata Lamarck, Anim. s. vert., 7:311 (17% lig. = 39.9 mm) 

 Habite... ; mon cabinet; length 39 ou 40 mm; mss. 1 ex. — Collection Lamarck, 

 Geneva: 3 spécimens. 



The 3 spécimens extant in the collection measure 45.5, 50.0 and 50.7 mm 

 respectively, and the smallest spécimen is larger than the dimension given by 

 Lamarck for the type. None of the spécimens is documented, and provided 

 Lamarck did not err in his measurements, we must présume that the holotype has 

 become lost. The smallest spécimen No. 1108/24: 45.5 X 13.2x23.5 is here selected 

 as the neotype of Mitra fissurata (Lamarck). The spécimen has 9 whorls with part 

 of the protoconch missing; it is creamy-white in colour, becoming livid towards 

 the lower half of the body whorl, and is ornamented with fine, net-like white lines. 

 The early whorls are sculptured with punctate grooves and axial striae, but the 

 sculpture becomes obsolète on the body whorl where only 2-3 grooves remain near 

 the suture. The aperture is narrow and elongate, smooth within and the columella 

 has 4 prominent folds. 



Kiener's figure of M. fissurata is rather similar to the spécimen figured here, 

 but his example originated from the Dupont collection. 



Scabricola (Swainsonia) fissurata (Lamarck), is the type-species of the 

 subgenus Swainsonia H. & A. Adams, 1853. The species has an Indian Océan 

 distribution. 



Mitra lactea Lamarck, 1811 

 (Fig. 23) 



1798. Tabl. Encycl. Méth., pl. 371, figs. 2 a, b 



1811. Mitra lactea Lamarck, Ann. Mus. d'Hist. Nat., 17:210, No. 35 

 1822. Mitra lactea Lamarck, Anim. s. vert., 7:312 (Hab: les côtes occiden- 

 tales d'Afrique?) 



1838. Mitra lactea Lamarck, Kiener, Spéc. gén. icon. coq. viv., p. 28, pl. 10, 

 fig. 30, 30 



Probablement l'Océan africain; mon cabinet; length 32 ou 33 mm; mss. 3 ex. — 

 Collection Lamarck, Geneva: 3 spécimens. 



