980 



W. O. CERNOHORSKY 



the holotype of M. torulosa. The spécimen is worn and faded, and has 8 angulate 

 whorls and a missing protoconch; it is white in colour, ornamented with 2 obsolète 

 light brown bands on the body whorl, and brown streaks on the axial ribs. Sculpture 

 consists of 11 slender axial ribs on the body whorl and 10 on the penultimate 

 whorl; numerous, finely granulose spiral cords encircle the shell. The aperture is 

 narrow, lirate within, pariétal wall is calloused and the columella has 4 folds. 



Mitra torulosa is the coarse-ribbed form of the species Vexillwn ( Costellaria) 

 exasperatum (Gmelin, 1791); the species is widely distributed throughout the 

 tropical Indo-Pacific, and both forms occur sporadically in a single population. 



Mitra ebenus Lamarck, 1811 

 (Fig. 40) 



1811. Mitra ebenus Lamarck, Ann. Mus. d'Hist. Nat., 17:216, No. 58 

 1822. Mitra ebenus Lamarck, Anim. s. vert., 7:319 



Habite...; mon cabinet; length 19mm; mss. 3 ex. — Collection Lamarck, 

 Geneva: 9 spécimens. 



During the years spécimens from other collections must have been added to 

 Lamarck's original 3 syntypes. We have selected a spécimen closely approaching 

 Lamarck's description and given size as the lectotype of M. ebenus. The lectotype 

 is spécimen No. 1108/17: 16.8 x 8.9 X 8.7 mm. The spécimen is rather worn, as 

 are the remaining spécimens, and has 6 whorls and a worn apex; it is blackish in 

 colour, ornamented with a narrow white presutural spiral line. The spécimen is 

 smooth apart from a few obsolète axial costae on early whorls and spiral cords on 

 the siphonal fasciole. The aperture is narrow, lirate within, the labial lip is 

 thickened, the pariétal wall has a white callosity and the columella has 4 white 

 folds. 



Pusia ebenus (Lamarck) is a well-known, variable Mediterranean species, 

 which occurs in both, smooth and axially plicate forms. 



Mitra harpifera Lamarck, 1811 

 (Fig. 41, 41 a, 41 b) 



1811. Mitra harpifera Lamarck, Ann. Mus. d'Hist. Nat., 17:217, No. 59 

 1822. Mitra harpœformis Lamarck. Anim. s. vert., 7:319 

 1X38. Mitra harpœformis Lamarck, Kiener, Spéc. gén. icon. coq. viv., p. 85, 

 pl. 25, fig. 78, 78 



L'Océan indien; mon cabinet; length 20-23 mm; mss. 2 ex. & 2 ex. (var. B); 

 Collection Lamarck, Geneva: 10 spécimens. 



