982 



W. O. CERNOHORSKY 



Lamarck's syntypes were intermixed with other spécimens and mounted on an 

 original de Lessert tablet. We have selected as lectotype a spécimen which agrées 

 closely with Lamarck's description and dimensions, and which appears to be the 

 spécimen figured by Kiener. The lectotype No. 1108/6: 16.9x7.1 x7.7 mm, has 7 

 whorls and a missing apex; it is whitish in colour, ornamented with livid spiral 

 zones at the sutures, intermixed with white in the central area, and a dark brown 

 interrupted spiral thread on each whorl ; a wide, orange-brown band is situated on 

 the lower half of the body whorl. Sculpture consists of 13 strong axial ribs on the 

 body whorl with the same number on the penultimate whorl, obsolète spiral striae 

 in the interstices and spiral cords on the siphonal fasciole. Aperture is moderately 

 narrow, lirate within and the columella has 34-1 folds. 



Mitra semifasciaîa is the type-species of Costellaria S wainson, 1 840 (as Mitra 

 rigida Swainson, which is a synonym) ; the species is widely distributed throughout 

 the tropical Indo-Pacific. 



Mitra retusa Lamarck, 1811 

 (Fig. 43) 



1811. Mitra retusa Lamarck, Ann. Mus. d'Hist. Nat., 17:217, No. 61 

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



L'Océan indien; mon cabinet; length 22-24 mm; mss. 9 ex. — Collection 

 Lamarck, Geneva: 12 spécimens. 



Lamarck's syntypes were mounted on an original de Lessert tablet, and the 

 séries contained 12 spécimens'. We have selected spécimen No. 1108/23: 20.3 x 

 13.0x 10.5 mm, as the lectotype of M. retusa. In 1811, Lamarck gave a size range 

 for his types, but in 1822 he restricted his type to a spécimen 9J4 lig. in length 

 (=20.8 mm); it is this spécimen which has been selected as the lectotype. The 

 spécimen is rather worn, and has 6 whorls and a worn apex; it is reddish-brown 

 in colour, ornamented with irregular, white longitudinal lines and a white peripheral 

 spiral line on the body whorl. Sculpture consists of obsolète spiral striae and 

 nodulose spiral cords on the lower half of the body whorl. The aperture is narrow, 

 smooth within, the labial lip is thickened and prominently crenulate and the 

 columella has 4 folds. 



Mitra (Strigatella) retusa is a moderately common species which lives in the 

 Indo- Pacific région. 



Mitra microzonias Lamarck, 1811 

 (Fig. 44) 



1811. Mitra Microzonias Lamarck, Ann. Mus. d'Hist. Nat., 17:218, No. 62 

 1822. Mitra microzonias Lamarck, Anim. s. vert., 7:322 



