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species whose habits were similar to those of the one previously 

 named ; but in this case the young took their places in the colony 

 immediately they hatched out. He had another specimen, which, 

 however, had not yet been described ; this was a species of 

 Brachionus with a very remarkable lorica. Another remarkable 

 creature which he had brought for exhibition was a Lepidurus, 

 one of the largest of the Entomostraca, which was allied to 

 Apus, but differed from it because of the presence of a curious 

 leaf-shaped process. These creatures were remarkable for the 

 extreme rapidity with which they were developed from the eggs. 

 In the district where they were found the ground was during 

 part of the year extremely dry and the soil a fine alluvium ; but 

 when the rains came, in April or May, the water remained in the 

 small pools which were formed, and in a month these were all 

 full of Leindurus. Another specimen was a Branchipus, a small 

 crustacean whose development was equally rapid. The so-called 

 " winter egg " was with them really a summer Qgg, protecting 

 the race from destruction during the drought and heat of summer, 

 but beginning to develop in the course of a few days after the 

 rains had begun. He had found these animals in the same place 

 during several successive years in a district which was always 

 completely dried up during the summer. 



Mr. Karop said the Lepidurus was certainly a very fine animal 

 of its kind — almost as large, in fact, as a young King-Crab. He 

 asked how long it would take to attain that size, and also what 

 it fed upon % 



Mr. Shephard said it would develop to the size of the specimen 

 exhibited in the course of five or six weeks ; but Apics would 

 develop in a much shorter time, and could be found within a 

 fortnight. Lepidurus mostly fed upon decaying vegetable matter. 



Mr. Karop thought it did great credit to its diet. 



Professor Marcus M. Hartog said that the very interesting 

 observations of Mr. Shephard suggested that he should give his 

 own experiences of the raising of Apus and Bircnchipus from mud 

 kindly sent to him by Herr Poppe, of Bremen, over twenty years 

 ago, when he was working at Crustacea. He found that the 

 same mud would give a succession of broods in successive years 

 if dried off between times — proving clearly that different eggs 

 attain the power of germination under similar conditions at 

 different times. Doubtless, from the inadequate size of the 



