Cerithiopsis fusiformis
Cerithiopsis fusiformis is a species of sea snail, a gastropod in the family Cerithiopsidae, which is known from the Gulf of Mexico and the Caribbean Sea. It was described by C. B. Adams, in 1850. Description 
The maximum recorded shell length is 3.3 mm. Habitat 
Minimum recorded depth is 0 m. Maximum recorded depth is 165 m.

References

fusiformis
Gastropods described in 1850