14 F. Stoliczka — Land-shells of Penang Island. [No. 1, 



KoTULA* BiJUGA, n, sp., PL i, figs. 4-7 and pi. ii, figs. 16-18. 



R. depresse conoidea et suborbiculata, vel late conica, angustissime um- 

 bilicata, tenui, cornea, pallide succinea ; anfractibus 5*5 ad 6'5, sutura 

 simplici, supra rare filiforme marginata, junctis, lente accrescentibus, in 

 superficie superiore convexiusculis, costulis transversis obliquis, eonfertis, 

 striis spiralibus confertissimis ac plus minusve distinctis intersectis, crispatulis 

 seu subgranulosis, ornatis ; ultimo ad peripheriam acute carinato, ad basin 

 modice inflato, nitido, sublsevigato, striis incrementi radiantibus atque alteris 

 spiralibus sub-obsoletis notato, medio cancaviusculo ; apertura angulatim 

 semilunari, paulum obliqua, labio tenuissimo vix distinguendo, labro ad mar- 

 ginem tenui, neque expanso, neque incrassato, ad insertionem umbilicalem 

 brevissime reflexo instructa. 



Dimensiones varietatum frequentium : — 



Alt. 



Diam. major. 



D. 



minor. 



Alt. testae. 



a. 14-5 





13-5 



HO 



h. 16-2 





150 



10-9 



c. 17-4 





15-6 



120 



d. 17-4 





16-0 



10-9 



aperturse. 



Lat. 



aperturae. 



60 





7-6 m.m. 



Q'Q 





8-2 „ 



7-2 





9-2 „ 



70 





9-0 „ 



Diam. maj. speciminis maximi 18.8 m.m. 



It will be seen from the above measurements, which are taken from the 

 four figured specimens, that the height of the shell is very variable, but the 

 increase of the whorls is very nearly quite constant. The upper convexity of 

 the whorls also slightly varies ; the sides of the spire are generally nearly 

 straight, more rarely conspicuously convex ; occasionally the peripherical keel 

 is somewhat projecting above the suture. The ornamentation is characteristic- 

 ally that of Botula, reticulately sculptured above, nearly smooth below. The 

 transverse ribs on the upper surface are traversed by fine spiral lines, which 

 generally only produce a slight undulation in the direction of the ribs, some- 

 times, however, a fine granulation is formed. As regards form, the present 

 species very closely resembles the Burmese B. anceps, (Gould), and also the 

 South Indian B. Shiplayi, the first has, however, the upper costulation very 

 fine and no spiral striae, while the latter has both much stronger developed, 

 producing a granular surface, and the shell is also more solid. The third very 

 closely allied species is B. indica, differing principally by a greater width of 

 the last whorl, and also by a stronger sculpture. 



* Comp. Jonrn. A. S. B., 1871, Vol. xl, pt. ii, p. 231. The name Botula has 

 also been applied in the Actinozoa, but if our zoological classification should make such 

 rapid progress, as it has done lately, it will, I think, in no long time be almost impos- 

 sible to find new names for the generic groups, and we shall be forced to modify the 

 existing rules at least so far that the same name may become reapplicable in at least 

 the five or six principal divisions of the animal kingdom. A further relaxation of the 

 rule would scarcely prove beneficial and would hardly be necessary. 



