LEPTOTHYBA. 1_>I)."> 



encircled by minutely granulose lirse, with small'T ones intercalated ; 

 three first whorls but little projecting, the fburtli double the length 

 of the first three, the last inflated ; penultimate and last whorls with 

 a median series of reddish-brown quadrangular marulations or with 

 the spiral line articulated with brown; beneath with a less obvious 

 zone of the same color; spiral Ime 7 to <S on the penultimate, ]."> 

 on the last whorl ; outer lip acute, slightly suleate, with dots of 

 carmine; inner lip arcuate, reflexed, planate ; aperture subrotund, 

 pearly; operculum calcareous, pearly. Alt, 11, diam. 10 mill. 



(Oaramagna. } 



7iYJ Sr<i atAssah, 



Collonia f/e*troi Caramagna, Hull. Xor.Nal. TtI., xiii, 1*8*, p. 132 

 t. 8, f. 10, 10a. 



Compare Turbo pnstiildtux Brocchi, a species with which L. gestroi 

 may possibly prove synomymous. 

 L. PYBOPU8 Reeve, 1848. PL 44, fig. 67. 



Shell somewhat depressly ovate, imperforated, sutures of the spire 

 simple, whorls smooth, spirally encircled with stria? ; whitish, lines 

 bright red, interior silvered. (Reeve.) 



Habitat unknown. 



Known to me only by Reeve's description and figure. It may 

 not be a Leptothyra. 



Doubtful, undetermined <ut<l Curious species of Leptothyra. 

 A portion of the following species can be determined by an inspec- 

 tion of the type specimens, in those cases where they can be found. 

 The others or all of them, perhaps, had better be ignored. I have 

 given the original descriptions. 



T. (COLLONIA) MARMOREUS ("Pease") Sowerby, 1886. PI. 69, fig. 

 25.' 



Testa minuta, ovata, imperforate, alba, pallide fusco-inarmorata ; 

 spire parva ; anfr. convexo-declives, ultimus leviter elevatus, infra 

 medium obtuse angulatus ; apertura oblique ovata. (Sowerby.} 



Sandwich Is. f 



Said to be in the British Museum under the above name. The 

 figure is from Sowerby. 



li. COSTATA Pease, 1869. 



Shell thick, solid, turbinate, narrowly perforate; whorls 4, trans- 

 versely ribbed, angulate at the middle, ribs largest at the angulation 



