General Notes. 47 



genus of flies, and again in 1835 Macquard used it in the same group. Thus 

 doubly antedated, Lydella, as a genus of bear animalcules, must be aban 

 doned. In its place I propose Microlyda. 



It should be remarked in passing, that the name Tardigrada, so long and 

 so generally employed for the group of which Microlyda is a member, is 

 itself antedated. It was first used in the present connection, as a family 

 name, by von Seibold as the Latin equivalent of Doyeres' French appella 

 tion " les tardigrades," apparently not knowing that it had previously been 

 used by Illiger (1811), Cuvier (1817), Burmeister (1830), and probably others 

 for a group of mammals. In 1861 C. A. S. Schultze called attention to 

 this and offered the family name Arctiscoida as a substitute. The case 

 had been already provided for, however. Xenomorphida, established by 

 Perty (Isis von Oken, p. 1241, 1834), as a family of crustaceans, included 

 all the bear animalcules then known and nothing else. As both Arctiscoida 

 and Xenomorphida were given as family names, other things being equal, 

 they would have precisely the same claims for adoption as class or ordinal 

 names. But since Arctiscoida is clearly antedated, Xenomorphida should 

 be accepted as the name of the group. W. P. Hay. 



