Occasional Papers of the Museum of Zoology 51 



Measurements 



Shell Aperture Operculum Wliorls 



alt. maj.diam. min.diam. alt. diam. long -wide 

 male 



(type) 14.0 51(7.2) 44(6.1) 41(5.7) 88(5.0) 31(4.4) 80(3.5) 5 

 female 15.8 58(9.2) 46(7.3) 43(6.8) 94(6.4) 34(5.3) 79(4.2) 5 

 female 17.2 57(9.8) 45(7.8) 43(7.4) 87(6.4) 32(5.5) 80(4.4) 5 



Tudora muskusi muskusi H. Burrington Baker 

 (1924; Naut., XXXVII, 93) 

 ?r. costata Vernhout (1914; Notes Leyden Mus., 180). 



Type locality: (ClTb) top of shore cliffs near Knip Baai, 

 northern Curacao. 



Distribution of species : Curacao ; along western side, from 

 north side of Plaja Abau to west side of entrance to Salinja 

 Sint Marie. 1,252 specimens collected. 



Distribution of subspecies : Curacao ; along western side, 

 from both sides of Plaja Abau to Sint Jan Baai (C17, 16, 15), 

 south of which subspecies grandiensis predominates. Quite 

 abundant on trees and brush and under rocks ; only found on 

 or very near limestone. 881 specimens collected. 



Shell (tig. xii-C) : heavier, but slightly smaller, than auran- 

 tia. Ground color : flesh-color to opaque whitish ; spiral bands 

 usually absent although single chocolate band not infrequently 

 circles the umbilicus from the parietal angle of the aperture ; 

 eroded apex and apical plug white to bluish drab, usually very 

 dark. Whorls: about 81^, of which 5 are usually retained; 

 not markedly convex, and with undulating suture rather well 

 impressed. Last whorl (fig. x-31) : growth costae quite 

 regular but widely spaced, very prominent, heavy and angular, 

 with a few, irregular, obsolescent cords between them; spiral 

 sculpture of obsolescent, rounded thickenings, which are 

 usually evident only as undulating buttresses along the sides 

 of the growth costae ; towards the umbilicus the spirals become 

 much more prominent, and surmount and break the growth 

 sculpture into heavy bosses. Earlier whorls : growth sculpture 

 lighter and broken by the prominent spiral sculpture into 



