VARICELLA, OLEACINA. 127 



senibles the other Porto Bican Varicellas and the Semitarum 

 group. Until we know much more of the soft anatomy of 

 these groups, we are in no position to decide upon the affini- 

 ties of aberrant or connecting forms. Whether glabra is 

 nearer to Varicella or to Oleacina remains to be determined. 



75. V. GLABRA (Pfeiffer). PL 19, figs. 37, 38. 



Manual Vol. I, p. 23. 



This fine species varies widely in shape, and several races 

 may possibly be recognized when sufficient material with 

 locality data is available. Shuttleworth however reports the 

 slender form (var. gracilior) as found with the typical at 

 Luquillo and San Juan. Two examples figured measure as 

 follows : 



Length 30.2, diam. 12, apert. 15.8 mm., whorls 7% 

 (Luquillo). 



Length 33.2, diam. 11.5, apert. 15 mm., whorls 8% 

 (Humacao). 



The latter (fig. 37) is the variety gracilior ', a name pre- 

 occupied by Adams. Shells even shorter than fig. 38 occur, 

 one measuring 22.7 x 12.3, aperture 15.25 mm., with 7 whorls. 



The egg 'capsules of the slender form (pi. 19, fig. 44) are 

 elliptical with slightly pointed ends, 6.5 x 3.6 mm., with a 

 hard white shell covered with a raised network pattern of 

 interrupted lines, which do not quite reach one pole. 



The embryonic shell of 3% smooth whorls forms a conic, 

 rapidly enlarging summit, very unlike that of all other 

 Porto Ri'can Varicellas, and shaped more like the apex of an 

 Oleacina, or of Varicella leucozonias. 



Genus OLEACINA Bolten. 



Oleacina BOLTEN, Museum Boltenianum, p. 110 (1798), 

 type and sole species 0. volutata Bolt. = 0. voluta Gm. 



Polyphemus MONTFORT, Conchyliologie Systematique, ii, 

 p. 414 (1810), type and sole species P. glans = 0. voluta 

 flexuosa. 



Glandina SCHUMACHER, Essai d'un nouveau Systeme des 



