ON A COLLECTION OF LAND- AND FRESHWATER 

 MOLLUSCA AND A FEW MARINE MOLLUSCA 



CHIEFLY COLLECTED BY Dr. H. A. LORENTZ 



FROM 



NEW GUINEA, THE ARU ISLANDS, TIMOR AND BORNEO 



BY 



M. M. SCHEPMAN. 



(With plates IV— VIII.) 



INTRODUCTION. 



The majority of the Mollusca enumerated and described in the following pages, has 

 been collected at the expéditions to New Guinea and the Aru Islands by Dr. H. A. LORENTZ 

 in 1907 and 1909/10 ; also some species hâve been found on Timor and Bornéo. 



Dr. j. W. R. KOCH collected in 1904 (one species in 1903) some marine Mollusca and a 

 few other ones; to thèse collections hâve been added some spécimens by Mr. G. M. VERSTEEG, 

 in 1912. As a rule, those spécimens where no name of collector has been annexed, are from 

 the first-named expéditions; I hâve mentioned the names of Dr. KOCH and Mr. VERSTEEG, 

 when I received the spécimens with their names ; a few exceptions remain, as f. i. with the 

 species of the genus Pinna, which were not accompanied by any indications of the persons 

 who collected them; I suppose that according to the year 1903 on the labels, they should be 

 still ascribed to Dr. KOCH. 



The troubles of war and failing health are the reasons that I hâve not been able to 

 make more anatomical researches. 



I owe much thank to Mr. G. K. GuDE and Mr. Ph. DAUTZENBERG, for assistance in 

 naming doubtful forms, Mr. J. J. VERWYNEN has much obliged me, by the loan of books, 

 from the rich library of TEYLER's Muséum at Haarlem ; by the aid of thèse persons I hâve 

 avoided as much as possible, to describe as new species, such forms as are already described 

 by my predecessors, but by the voluminous and much dispersed littérature, it is nearly 

 impossible always to avoid such mistakes, especially as not in every case the described species 

 hâve been figured.- For such cases I must invoke the indulgence of my fellow-conchologists 

 and hope they will excuse me, on account of the unfavorable circumstances mentioned above. 



Nova Guinea. XIII. Zoologie. 



