1920.1 NATURAL SCIENCES OF PHILADELPHIA. 315 



The aperture is long and narrow, dark brown within, the outer 

 Hp contracted above, having a deeply placed median fold in the 

 throat. Cohimellar plaits whitish, four, sometimes with a short 

 tubercle between the first and second. 



Length 25, diameter 10.4, length of aperture 14 mm. 



Length 22.5, diameter 10, length of aperture 12.3 mm. 



Hilo, Hawaii. D. Thaanum. Also collected on the Honolulu 

 Harbor dump in considerable quantity by Prof. Wm. A. Bryan 

 several years ago, and by the writer in 1913. 



Hawaiian examples have the spire less deeply grooved, and the 

 last whorl more extensively smooth than M. ticaonica Reeve of the 

 Philippines. They appear to be worthy of varietal separation. 



Strigatella Juscescens Pse. (Proc. Zool. Soc, 1860, p. 146; Amer. 

 Journ. Conch., Ill, 233) differs by the white aperture and 5-plaited 

 columella. 



The Honolulu specimens have faded to a tawny or ochraceous 

 buff tint. The largest measures, length 31, diameter 1 1 .3, aperture 

 15 mm. (fig. 14). 



Mitra olivellaeformis n. sn. 



The shell is similar to M. ohvaeforrnis Sw. except that it is more 

 slender, and the entire last whorl is provided with impressed, punc- 

 tured spirals, about 13 on the last whorl. 



Length 11.2, diameter 4.7 mm. Type, Niihau. 



Length 15, diameter 5 6 mm Viti Islands. 



Niihau. Type 67779 A. N. S. P. 



The typical M. olivaejormis Swains." has two or three puncture 

 series about the summit of the last whorl. It has been found in 

 Honolulu Harbor by Prof. W. A. Bryan, who gave me a specimen. 



Mitra langfordi n. sv. PI. XII, fig. 20. 



Closely related to M. granatina Lam. (M. scdbriuscula L., of 

 Reeve and Tryon), but constantly smaller, with smaller secondary 

 spirals and several fine striae in the intervals between major spirals; 

 of the latter there are five on the penult whorl, with a smaller one 

 above, near the suture; the brown lines of these spirals are con- 

 tinuous or nearly so (while in granatina they are much interrupted). 

 Columella with four or five plaits. The embryonic stage, of about 

 3 whorls, is smooth and pink. 



Length 35.3, diameter 11.4, length of aperture 18 mm; 8 post- 

 embryonic whorls. 



"Zoological Illustrations II, second series, 1831, Mitranae, pi. 6, fig. 3. 



