316 ANNUAL RECORD OF SCIENCE AND INDUSTRY. 



the object in question to be a liver-fluke, Distoma hepaticum 

 a rare parasite in the human body, and belonging to the 

 liver. The case was a very remarkable one, as being the first 

 instance on record in which an entozoon of this character had 

 been known to enter the alimentary canal. 2 D, 1873,364. 



A NEW MUSHROOM MITE. 



A new mite, of the genus Tyroglyplms, has been discover- 

 ed in vast numbers in a species of mushroom. 13 A, Decem- 

 ber 1,1873,455. 



EXPLANATION OF THE ALLEGED OCCURRENCE OF THE KING- 

 CRAB IN HOLLAND. 



In view of its supposed restriction to North America, much 

 astonishment was excited some time since by the discovery 

 on the coast of Holland of specimens of the American horse- 

 shoe, or king-crab. More recently, however, the problem has 

 been solved by a communication in the Zoologist, by Mr. W. 

 A. Lloyd, who remarks that in 1860 numbers of these crabs 

 were imported alive into Hamburg, and sold about the streets, 

 and that many were purchased and kept in aquaria and else- 

 where. On one occasion, a faw years later, a large number 

 were shipped from New York to Hamburg, and the market was 

 glutted thereby. With much tender-heartedness Mr. Lloyd, 

 who was then director of the great aquarium of Hamburg, in 

 preference to allowing this great number to die, took occa- 

 sion to have them thrown into the sea off the island of Heli- 

 goland, this taking place in August, 1866. Whether the ani- 

 mals captured are those originally introduced in this summa- 

 ry manner, or their descendants, is not known, but there is no 

 good reason why the species may not hold its own in these 

 seas, and in time become as abundant as they are on the 

 American coast. Zoologist, February, 1874, 3845. 



greef's new amoeboid. 



Dr. Greef has lately published an elaborate account of the 

 amceboid fresh-water organism, of which brief mention was 

 made by him not long ago, under the name oiPelobius. As, 

 however, this term was previously appropriated in entomol- 

 ogy, he now calls this object Pelomyxa palustris. It was first 

 noticed by him in the vicinity of Bonn and of Marburg, devel- 



