new Species of Pleurotomide. 213 
but on closer examination the upper third part of each whorl 
is found to exhibit only the longitudinal ribs, which are sud- 
denly directed obliquely to the left. The white band 
occupies about half the whorl, and includes the four upper 
series of granules. The transverse striation is fine and most 
easily seen on the upper part of the whorls. 
Pleurotoma (Crassispira) melanacme. 
Testa elongato-ovata, spira subacuminata, fusco-cinerea, costis liris- 
que albidis ornata; anfract. 75, primi 2} leves, politi, nigri, 
ceteri superne excavati, inferne costis parvis 12, liris spiralibus 
3 supra costas incrassatis clathrati, striis spiralibus incrementique 
lineis insculpti; anfr. ultimus liris spiralibus ad 15, superioribus 
tribus supra costa subnodosis, succinctus ; apertura parva, fusca, 
longitud. totius + paulo superans ; sinus parvus, paululum infra 
suturam situs; canalis brevissimus. 
Long. 72 mill., diam. 3. 
Hab. St. Vincent, West Indies. 
The upper half of each whorl is concave, and not crossed 
by the ribs, which are situated below. Of the three spiral 
lirations which connect the ribs, the upper one is rather more 
slender than the others. ‘There is a slight thickening just 
below the suture. 
Pleurotoma (Mangilia) modica. 
Testa ovato-fusiformis, sordide albida, ad apicem pallide rosacea ; 
anfractus 6, supremi duo leves convexi, ceteri convexi, medio 
rotunde angulati, costis crassiusculis 10 supra spiram continuis 
instructi; coste anfr. ultimi paululum ante basim liris spiralibus 
circiter 6 circa caudam interrupte ; apertura parva, longitudinis 
totius =2, adequans; labrum extra valde incrassatum, superne 
levissime sinuatum, intus leve ; columella callo pertenui amicta; 
canalis latus, brevis. 
Long. 6 mill., diam. 23. 
Hab. Japan ? 
The nearest ally of this species is P. septangularis, vay. 
secalina, Philippi; but the ribs are more acute, and there is 
no spiral sculpture except the few lirations around the base of 
the body-whorl, which are rather coarse. 
Pleurotoma (Mangilia) minutistriata. 
Testa ovata, sordide albida; anfract. 74, primi 14 leves nitentes, 
ceteri costis obliquis 13-14 (in anfr. ultimo paululum ante basim 
obsoletis) instructi, ubique exiliter (presertim inter costas) 
spiraliter incrementique lineis striati ; apertura ovata, longit. 
totius fere 2 equans ; labrum costa ultima incrassatum, vix sinu- 
