1873.] F. Stoliczka — Land-slielJs of Fenang Island. 23 



always appears to remain smaller than on the corresponding teeth of 

 T. castra ; the outermost laterals were not observed, they must be very thin. 

 The genital organs are distinguished by a very great length of tlie 

 seminal receptacle and of the seminal duct ; the former is one and a half to 

 nearly two inches long ; it is somewhat widened near its origin but further 

 on almost throughout equally thin. 



Fam. Vitrinidge. 



ViTEiFA NTJCLEATA, n. sp. PL i, fig. 12 and pi. ii, figs. 4-6. 



Vit. testa depresse ovata, tumidula, tenui, pallide cornea, translucente ; 

 anfractibus 3*75, nucleo 1*5 anf. composito, late conico, inflato, la^vigato, 

 duobus anf. sequentibus ad suturam adpressis, subcanaliculatis, rapide 

 accrescentibus, nitidis, transversim striis incrementi minutissimis notatis ; 

 apertura ampla, per-obliqua, labio undique tenuissimo, ad basin valde rece- 

 dente, margine supero convexiusculo. Diam. maj. 9, diam. minor 7, alt. test. 

 5*3, alt. aperturse 4*8, ejusdem latitudo 6'1 m.m. 



A characteristically distinct species, by having the nucleus composed 

 of one and a half whorls, conically tumid, while the next whorl is at its 

 beginning only very narrowly exposed, or almost entirely covered. The 

 outer lip is very thin, almost membranaceous, and simple throughout. 



V. nucleata is one of the rarest Penan g shells. I found three live 

 specimens on the Penang hill in dense forest on old wood, about 1000 feet 

 above the sea, and two more old shells at the base of the hill. 



The animal is entirely black, only slightly paler at the front sides of 

 the foot ; it is very long and slender, its total length being about four times 

 that of the longer diameter of the shell ; the anterior part is the much 

 shorter one, the posterior tapers into a point, and the whole is warty and 

 grooved. The mantle, however, is nearly smooth. In quite fresh speci- 

 mens the two shell lobes entirely cover the shell, but generally the left 

 lobe covers a little more than one fourth of the last whorl extending from 

 the margin of the mouth, while the right lobe also covers one-fourth of it 

 beginning at the angle of the mouth, but at the same time also envelopes the 

 whole spire. The neck lobes are also well developed, rounded, with simple 

 edges, the left is much larger and longer than the right one. The sole of foot 

 is pale brown, divided by two grooves in nearly three equal parts, of which 

 the median is smooth and the lateral transversely sulcated. Pedal row well 

 marked by a thin groove above and along the entire base of foot. 



The jaw is semilunar, radiately finely striated, with a blunt projection 

 in the centre of the concave edge ; the outer or convex portion is smooth ; it 

 measures about 0"75 m.m. in breadth. 



The radula is about two mill, long and half a mill, broad ; there arc 

 110 transverse, almost quite straight rows, but only 61 teeth in each of them. 



