466 A'. 'T. Bnsh — Mollusca of Cape Hatteras. 



flattened whorls, with the suture indistinct defined by a thread of 

 dark cliestnut-brown, above and below which there is an indefinite 

 band of yellowish white, gradually shading, towards the centre of the 

 whorls, into liglit yellow or brown, sometimes mingled with purple. 

 The nucleus is small, consisting of about three regularly coiled whorls 

 of a light purple or amethystine color. Base prominent, angulated, 

 with a moderately large and deep umbilicus, margined by a dark 

 chestnut-brown thread. Aperture nearly quadrangular, the angles 

 being formed at the termination of the dark threads, defining the base 

 and the umbilical region, somewhat produced at the anterior angle, 

 forming an indistinct notch. Outer lip thin, with a dark chestnut- 

 brown edge ; inner lip regularly curved, slightly reflected over the 

 umbilicus, with a somewhat thickened, dark chestnut-brown edge ; 

 just back of this there runs across the base, from within the umbili- 

 cus to the sutural thread, a thread or sti-eak of the same dark chest- 

 nut-brown color, and throughout the entire length of the shell, with 

 the exception of the nucleus, similarly colored streaks occur, crossing 

 the whorls at irregular intervals. In specimens somewhat eroded, fine 

 but distinct lines of growth cross the whorls at pretty regular inter- 

 vals, and occasionally even in fresh specimens indications of them are 

 seen. Operculum horny, very thin, liglit yellow. 



Length of the largest specimen, V'S'""^ ; breadth, 3-5""" ; length of 

 aperture, 2'5'"'" ; its breadth, 2""". 



Common in 7 to 32 fathoms. 



Odostomia engonia, sp. nov. 



Shell long, rather stout, white, lustrous, obelisk-shaped, consisting 

 of seven and a half flattened whorls, distinctly chamfered above the 

 suture which is canaliculate. The surface is apparently smooth ex- 

 cept a rather prominent, rounded, revolving thread at the angle of 

 the whorls, but under the microscope it is covered with numerous, 

 unequal, indistinct strite. Nucleus very small, just showing above 

 the first whorl. Body whorl distinctly angulated at the 2)eriphery 

 where there is a prominent, rounded thread, with a somewhat elon- 

 o-ated, rounded base. Umbilicus small, dee}), nearly concealed by the 

 reflected inner lip. Aperture oval, anteriorly considerably |)roduced 

 beyond the base. Columella with a small, distinct fold within the 

 aperture not seen in a front view. 



Length, 5""" ; breadth, 2'""^ ; length of aperture, 1 vS""" ; its breadth, 

 1""". A more matm-e specimen from Beaufort, N. C, is G'5""" long; 

 2-8""" broad; with an aperture 2""" long and 1""" broad. 



One living and a few dead specimens, in Id and 10 fathoms. 



