ZOOLOGISCHE MEDEDEELINGEN 



UITGEGEVEN VANWEGE 



's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE 



Deel IV. 



te 

 LEIDEN 



Aflevering 1. 



I. — ON A COLLECTION OF LAND-, FRESHWATER. AND MARINE 

 MOLLUSCA FROM NORTHERN NEW GUINEA. 

 BY M. M. SCHEPMAN. — (WITH PLATE I). 



INTRODUCTION. 



The Mollusca, recorded in this paper, have been collected by 

 Dr. P. N. van Kampen and Mr. K. Gjellerup, during their abode in 

 New Guinea, in 1910 and 1911. The collection is made near the eastern 

 boundary of the Dutch part of the island. „Hollandia" is the name of a 

 camp on the Kajo-bay, a small bay on the western coast of the Hum- 

 boldtbay, „Hussin" a camp on the Bewani-river, „Zoutbron" (3°l'13"s., 

 140° 57 7 30" e.) a camp on the Begouxe-river. The Mbai and Fate are 

 small rivers, which flow in the Humboldtbay near Hollandia, the Tjahé 

 is a small branch of the Mosso. The other localities are to be found on 

 the map which belongs to an article of Capt. Sachse in the „Tijdschrift 

 v. h. Kon. Nederl. Aardnjksk. Gen." (2), dl. XXIX, 1912, p. 36. 



The collection contains about 60 species, amongst which 9 are nev\ 

 to science; moreover a few new varieties have been described. Perhaps 

 this number of novelties would have been still more considerable, if some 

 of the difficult forms, such as Helicariojt, had been at hand in larger 

 number of specimens; but I did not like to encumber science with 

 vague descriptions of new species, which could not be recognized by 

 later students. 



I have to thank Mr. Ph. Dautzenberg and Mr. G. K. Gude, for 

 their assistance in identifying some species, which were doubtful to me, 

 and again Mr. J. J. Verwijnen for the loan of books from Teyler's 

 Museum at Haarlem. 



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