1881.] SOCOTRAN LAND-SHELLS. 807 



Medium specimen : — 



Major diam. 0*26, alt. axis 0*67, alt. apert. 0*28 inch. 

 s, j> 69, „ 17'0, „ 7'5 millim. 



Loealitij. Eastern end of the island, on limestone. 



11. BxiLIMINUS (ACHATINELLOIDES) SEMICASTANETJS, n. SD. 



(Plate LXVIII. fig. 9.) 



Shell rimate, solid, fusiform ; sculpture fine oblique striation, to 

 the naked eye polished ; colour milky white on last two whorls, chest- 

 nut or sienna-brown on the five apical ; spire elongately pyramidal, be- 

 coming rapidly attenuate at the apex, sides convex ; suture rather 

 shallow ; whorls 7, body-whorl tumid, side convex ; aperture ovate, 

 suboblique ; peristome continuous as a strong callus on the body- 

 whorl, rather flattened on the outer margin ; columellar margin with 

 well-marked fold, oblique, somewhat thickened and angulate near 

 the upper inner margin. 



Longest specimen : — 



Major diam. 0-22, alt. apert. 022, alt. axis 039 inch, 

 »> „ 55, ,, 5'5, „ lO'O millim. 



Shortest specimen : — 



Major diam. 0-22, alt. apert. 0-22, alt. axis 0-37 inch. 

 >, „ 5'5, „ 5-5, „ 9"5 millim. 



Locality, [South side of island on limestone rocks, nearly 1000 

 feet ; nine specimens were found. — B. BJ] 



12. BULIMINUS (ACHATINELLOIDES) SEMICASTANEUS, Var. ALBA 



(Plate LXVIII. fig. 10.) 



Shell fusiform, narrowly rimate, smooth ; sculpture fine oblique 

 somewhat irregular striation ; colour all white ; spire elongate, sides flatly 

 convex, apex subacuminate, suture very shallow ; whorls 6-7, sides 

 very flat ; aperture ovoid, subvert ical ; peristome sharp, continued 

 as a thin callus on the body-whorl ; columellar margin straight, with 

 an internal plication, slightly reflected over the rimation. 



Size : — 



Major diam. 0-14, alt. axis 0*36, alt. apert. O'lSinch. 

 „ „ 3'7, „ 9'3, „ A-7 millim. 



Locality- [S.W. of GoUonsir on the limestone ridge, over 1000 het ; 

 only 3 specimens were obtained.^ — B. B.'\ 



This shell is very close to B. semicastaneus ; but it is much flatter 

 on the sides and not so tumid in form, and is no doubt a local variety. 

 There are only three specimens in the collection. 



13. BuLiMiNus (Pachnodus) heliciformis, u. sp. (Plate 

 LXIX. figs. 7, 7a.) 



Ovately fusiform, tumid, thin, diaphanous ; sculpture thin, a few 

 transverse lines of growth; colour olive-brown ; spire pyramidal, suture 



