THE PTEROPODA OF THE LEYDEN MUSEUM. 181 



NOTE XVIII. 

 THE PTEROPODA OF THE LEYDEN MUSEUM 



BY 



Dr, J. J. TESCH. 



(With plate 7). 



The material of Pteropoda iu the collection of the Leytleu 

 Museum is rather poor and consists only of a few species, 

 one of which, however, is new to science, while others are 

 rarely met with. So I think it to be not wholly destitute 

 of importance to enumerate the different forms, as it gives 

 rise to some remarks on morphology as well as on dis- 

 tribution, which will follow after the systematic part. A 

 large deal of the collection was supplied during the last 

 few years by Mr. P. J. Buitendijk, physician at the Royal 

 Steam-Shipping Company » Nederland", to whom the Museum 

 is indebted for his zealous collecting zoologica, on his 

 periodical travels to the East- and West-Indies and vice- 

 versa. As circumstances, however, allowed him to effect 

 occasional hauls at the surface only, his captures of pelagic 

 animals (at least with respect to Pteropoda) are neither 

 much varied nor do they contain remarkable forms, with 

 the exception of a few cases which will be discussed later 

 on. — Another part of the Pteropod-material was procured, 

 about thirty years ago, by the late captain J. R. Lusiuk, 



1) In a former paper (p. 7) I proposed to use not the term „Pteropoda" 

 any longer, as, according to Boas and Pelsenecr, it unites two groups, which 

 really do not belong together and have a polyphyletic origin. Presently, 

 without prejudicing anything about their separate pedigree, I think it more 

 convenient to keep, provisionally at least, the title, firstly because its meaning 

 has become familiar in zoology, and secondly because recent researches (Meisen- 

 heiraer and Schiemenz) are more or less sceptic about Pelseneer-s assertions. 

 Notes from th.e Leyden Museum, Vol. XXIX. 



