TEREBRID^E. 7 



D. Shell having the aperture oblong, narrow, the whorls numer- 

 ous, grooved, plicated or cancellated. (MYURELLA, Hinds.) 



a. A spiral groove nearl} equally dividing the whorls. 



T. duplicata, Lam. 



b. Sutural portion (or band) narrow. T. dislocata, Say. 



Second Division. (TEREBRA, Adams.) 

 (No subdivisions). T. oculata, Lam. 



Reeve, who monographed Terebra in 1860, in his " Concho- 

 logia Iconica," admits 155 species ; a considerable reduction on 

 the number enumerated by Deshayes, nearly half of whose 

 species are here made synonyms, after examining their types in 

 the Cumingian Collection. Mr. Reeve says : " M. Deshayes was 

 induced to undertake the investigation of the genus under circum- 

 stances hardly favorable tc the proper discrimination of the 

 species. Specimens were transmitted to him in Paris, from the 

 Cumingian Collection, and his means of comparison with the 

 types of Mr. Hinds' species being necessarily limited, many 

 that were already named were described by him as new, and 

 many were described by him as new that a more extended series 

 of specimens would have shown to be merely varieties. Out of 

 221 species cited by Deshayes, in his recent memoir, I have 

 before me the original types and series of types of 214. All 

 the figures of this monograph are drawn from the types them- 

 selves, and no subsequently described species is quoted as a 

 synonym, except as resulting from an actual comparison with 

 the types." Mr. Reeve's monograph is certainly worked up 

 with more than usual care and judgment ; nevertheless, he has 

 made some erroneous identifications, as will be apparent in the 

 course of the following pages. 



In the present monograph, notwithstanding the additional 

 species described and figured since 1860, the synonymy is much 

 enlarged, and the admitted species reduced to about 120; exclu- 

 sive of about 50 species, described but not figured, and there- 

 fore not susceptible of identification. 



Agreeing with Mr. Hinds that the species of Terebra cannot 

 be advantageously divided into subgenera (with the exception 

 of Euryta), 1 have essayed a classification by sections and sub- 



