Verrill and Bush — Marine Mollusca of the Bermudas. 533 



First species — G. Mutinensis Sacco, (Tab. i, f. 102) 1892 — taken 

 for type. 



The sides of each whorl concave with a cingulura just below each 

 suture. 



Odostomia (Cyclodostoiriia) didyma, sp. nov. 



Plate LXV. Fig. 14. 



Shell minute, white, subovate, consisting of five whorls besides the 

 minute, slightly prominent, upturned, apical whorl. The whorls of 

 the spire are strongly flattened and somewhat concave in the middle, 

 with a somewhat raised, thick, rounded cingulura just above, and one 

 just below the suture, which is deeply impressed and somewhat can- 

 aliculate. On the body-whorl there is a deep groove just below the 

 peripheral cingulum, bordered anteriorly by another similar cingu- 

 lura. Base but little produced, with a small spiral rib in the umbili- 

 cal region. Aperture small, broad-ovate, slightly flaring anteriorly. 



Length of the only specimen, 1.3°^"^ ; breadth, about 0,7™'°. 



From the shell-sand. 



Subgenus Evalea A. Adams, 1860. Type, E. eJegans A. Adams. 

 Evalea A. Adams, Ann. Mag. Nat. Hist., vi, p. 32, 1860. 



" Test having the form of an elevated cone, somewhat turrited, 

 high spire with the whorls (5) transversely sulcate or striate. Aper- 

 ture oval ; outer lip produced with a transverse columellar fold." 



First species — Odostomia elegans A. Adams, 1860 {no7i Montero- 

 sato, 1869) — taken for type. 



Transversely grooved or sulcate species of Odostomia. 



Odostomia (Evalea) Somersi, sp. nov. 



Plate LXV. Fig. 7. 



Shell small, thick, ovate Avith four whorls besides the small, 

 upturned nucleus. Suture canaliculate. Whorls slightly convex, 

 with three narrow, incised grooves, producing three broad, strong, 

 rounded cingula. Base of the body-whorl smooth. Aperture ovate, 

 acute posteriorly, slightly jiroduced at the anterior angle, and with 

 a distinct columellar plication deep within the aperture. 



Color white, sometimes in fresh specimens tinged with flesh-color. 



Length, 2,5""'° ; breadth, about 1,28""'\ 



Common in the shell-sand. 



