78 Contributions to Indian Malacology, No. IX. [No. 2, 



of its distinctness, and although, from the exeellenee of ^rawing* 

 m ade of it, it is improbable that there would be any difficulty m 

 recognising it again, still the practice of describing shells from draw- 

 ings is so objectionable, and has led to so much confusron, tha I do 

 not think it should be permitted, except where the draughtsman 

 himself is the describes* _ 



This unnamed form and the remaining simstrorse kind which 1 

 have called D. giUosa, arc the first reversed species yet found in he 

 Eastern portion of the British possessions in India. From the West- 

 em Himalayas, D. Suttoni has been known for many years, and it is 

 curious and interesting to find that both dextrorse and simstrorse 

 JMtommati^, occur in the Khasi Hills, as well as at the North- 

 western extremity of the known range of the genus. Captain God- 

 win-Austen's extensive researches have raised the number of forms 

 from the Khasi Hills to 8, viz., 6 dextrorse and 2 sinistrorse, or one 

 more than all the species hitherto collected in both the Eastern and 

 Western Himalayas, even when the new form from Daijiling is in- 



" "This new form, now first described, was found by myself in 1856, 

 but the few individuals procured, remained unnoticed amongst my 

 numerous specimens of D. pachycheilus, Bens., until lately I now 

 give a description of it, in order to complete, so far as possible, the 

 list of Indian and Burmese Diphmmatinw. 



1 BlPLOMMATINA SEMISCTJLPTA, 11. Sp. PL I. fig- 6. 



Testa dextrorsa non rimata, ovato-comca, solidiuscula, albida vel 

 sueeinea. Spira conica, subattenuata, apice acutiusculo, sutura 

 superne mediocriter impressa, subtus profunda. Anfr. 7 convexi, 



wWh the orieinal drawing was taken, belonged to one ot the species smoe 

 £ X e L IS the drawfng was carefnlly made, and the desenber a natura. 

 b^Tas carefnl and eonscientions as Mr. Benson. What errors may be com. 

 miled bv less oarefnl natnralists may be understood by studying the h.story 

 Tlrtlus cucullatus in Jerdon's Birds of India, Vol. II. m. 56, 872 

 Of course there are parts and important parts of animals, such as the _so 



