02 



There is, however, a more vital contradiction in the text. On 

 p. 620 in a discussion of the facts presented in Table I we read: 

 "Die kleineren Eier zeigten eine geringe Xeignng sich schneller 

 zu entwickeln." On p. 647 referring again to the Table I we 

 read: "In den Furchungs- unci (iastrula-Stadien zeigen die 

 kleineri Eier die Tendenz, sich wenigerschnell zu entwickeln, als 

 die grosseren Eier." And further on, p. 647, and referring 

 again to the Table I, we read: " Da wir nun aber gesehen haben, 

 dass die grossen und kleinen Eier sich gleichgut und gleichrash 

 entwickeln (s. Tabelle 1) etc." 



Thus it appears that the small eggs develop somewhat faster, 

 and slower than the large eggs, and just as well as the large 

 eggs! 



Sergius Morgulis. 



PARASITOLOGY 

 Cestodes of Birds.— Fuhrmann has recently published (Zool. 

 Jahrb., Suppl. 10, Heft 1) a most valuable monograph on the 

 Cestodes of Birds. He had at his disposal all the material from 

 the great European museums and from the private collections 

 ot prominent European helminthologists, so that the work is 

 vastly more valuable than a mere literary revision with studies 

 on limited personal collections. In 1782 Gceze described 14 

 species of Taenia from birds; in 1819 Rudolphi listed 54 certain 



nd 30 uncertain 



species, and m 1850 Diesing recorded 81 cer- 



tain and 28 questionable species. Von Linstow's Compendii 

 der Helmmthologie and Nachtrag in 1889 gave references to 230 

 bird cestodes from 340 host species. In this investigation Fuhr- 

 mann had material from 200 more species of birds at his disposal 

 and recorded in all some 500 cestode parasites from them. When 

 one considers that 12,000 species of birds are known and Cestodes 

 have been collected from 540 only, it is clear that manv more 

 new f 0rms are t0 be expected . these ^ ^ ^ 



mently from extra-European lands. North America which 

 Fuhrmann notes as relatively unexplored, will contribute its 

 share and I may add that investigations in this field are already 

 m finished manuscript as studies from my own laboratory. 



Some of the general conclusions which Fuhrmann has reached 

 as a result of his 12 years of work in this field are of wide inter- 

 est. The distribution of cestodes among the various group of 

 birds shows that a given species occurs only in a given -roup 



