4j 



DESCRIPTIONS OF NEW SPECIES OF MARGINELLA AND 

 MUCRONALIA FROM SAO THOME. 



By J. R. i.E B. TOMLIN and L. J. SHACKLEFORD. 



(Read before the Society, March 12th, 1913). 



Marginella liparozona^ nsp. 



This name is proposed for the species figured by Reeve in the 

 Conch. Icon., pi. xix, fig. 93, as M. /estiva Kiener. The 



latter, however, is a narrower, longer and more fusiform shell, which 

 we figure from a S. Thome example. Both species have three 

 narrow red bands, the colour in fresh examples of festiva Kien. 

 being rather deeper, but apparently more fugitive, and the figure 

 we give was taken before a really fresh specimen came to hand 

 (pi. i., i. 3, 4). The outer lip of M. liparozona has somewhat of a 

 curve and the lower half of the aperture is much broader than in festiva. 

 Between the red bands the pattern in both species is variable, but there 

 always seems to he a well marked broader white band or area in 

 festiva through which the central red band passes, whereas the 

 longitudinal dark markings in liparozona usually come close up to 

 the red. The confusion of these two species seems to have been 

 general, at any rate since Reeve's time. To Kiener and Sowerby 

 (who figures the xeaX festiva in his Thesaurus) the locality oi festiva was 

 unknown, while Reeve gives the probably incorrect one of " East 

 Africa'' for liparozona. We can now record the occurrence of both 

 these species at the Island of S. Thome. 



Type of M. liparozona in coll. Tomlin, as aie also those of 

 M. eveleighili. & S. (pi. i., f 5, 6), and M. melvilli T. & S. (pi. i., i, 2). 



Mucronalia leucophaes' n.sp. (pi. i., f. 7, 8). 



Shell oblong-ovate, acuminate, imperforate, highly polished, of a 

 shining vitreous white, so transparent that the whole length of the 

 columella can be seen through the shell ; whorls 9 (?), moderately 

 convex ; suture, rather slightly impressed ; aperture small, sub- 

 quadrate, two-fifths of the length of the shell; peristome simple, 

 acute ; columella slightly arcuate. 



Long. 10 mm.; diam. max. 5*5 mm. 



Aperture — diam. max. 4 mm. ; diam. min. 3 mm. 



Hab.: S. Thome. Type in the Brit. Mus. (Nat. Hist.). 



This shell bears a strong resemblance to M. philippinaruni' Sow. 

 from Cebu. It is, however, broader in proportion to its length, the 

 suture is much less impressed, the aperture is different in shape, 

 and the shell has a thinner, more transparent texture. The apical 

 whorls are unfortunately gone in the few examples so far received. 



I XiTra/aOJ'oj^/os, bright-girdled. 2 Xei/KO^a?;?) white-gleaming. 3 Pro. l\lal. Soc, iv. p.127, pi. 11. 



