1868.] Contributions to Indian Malacology, No. IX. 79 



primi costulati, postremi kevigati, antepenultimus major, ventricosus, 

 penultimus juxta aperturam leviter constrict™, ultimus antice ascen- 

 dens, subtus rotundatus. Apertura verticals late auricularis, peris- 

 toma incrassato-expansum, subduplex vel duplex, margine dextro 

 subrecto, columellari sinuato, angulo saliente subtus desinente basali 

 juxta angulum fere concavo, dente columellari valida, callo parietali 

 mediocriter expanso, tenui, appresso. 



Long. 4, diam. 2 mill. ; Ap. cum peristomate 1} mill, longa, intus 

 1 lata. 



This shell is easily distinguished from its congener D. party cleilus, 

 Bens., by the greater tenuity of the antepenultimate whorl,* the 

 absence of sculpture on the lower whorls and the more prominent 

 angle at the left lower corner of the peristome. This last character 

 in D. semisculpta is rather stronger than appears in the figure. The 

 present species is much more closely allied to D. dijjlocheilus, Bens., 

 which it resembles greatly in sculpture and form. The principal dis- 

 tinction is in the peristome which is much less developed in B. semi- 

 sculpta, the parietal callus being quite thin and appressed instead of 

 standing out from the last whorl as in that species. The mouth also 

 is larger in proportion, the angle at the base of the columellar margin 

 more salient, and the spire more acuminate. It would not, however 

 be surprising if intermediate varieties should be found to connect these 

 two forms. 



2. D. scalaria, n. sp. PI. II. fig. 2. 



Testa dextrorsa, nonrimata, ovato-acuminata, subfusiformis, costulis 

 validis verticalibus distantibus ornata, pallide succinea. Spira cornea, 

 sub-turrita, apice subacuto, sutura valde impressa. Anfr. 7 rotundati. 

 duo primi laevigati, tertius confertim-, caeteri distanter-costulati, 

 antepenultimus major, tumidus, ultimus versus aperturam ascendens, 

 basi rotundatus. Apertura subverticalis, leviter sursum spectans, 

 late auricularis, plica columellari mediocri intus munita : perist. 

 duplex, internum continuum, expansum, externum expansum, fere 

 retro-relictum, margine dextro juxta anfractum penultimum sinuato, 

 tunc angulatim antice porrecto, subtus una cum basali recto, columel- 

 i lari verticali, subtus angulo obtuso desinenti, callo parietali expanso, 

 superne suturam fere attingente. 



* In Pfeiffer the length of D. pachyclieilus is given as 4 mill., diam. 2£. 

 The length should be 5 mill. 



