1S96.] Embryology. 509 



end of the female and they are sucked in through the tube at the pos- 

 terior end of the female by a sort of pumping motion maintained by 

 some peculiar muscular action on the part of the female. 



The'maturation stages viewed externally and in section present the 

 usual phenomena with one peculiarity, the formation of four polar 

 globules instead of three, the second globule extruded dividing in the 

 same manner as the first, thus giving rise to the additional body. 



The first division of the egg presents a two cell stage, the second 

 division, a three cell stage, the third division a four cell stage followed 

 by the eight, sixteen and thirty-two cell stages. In the four cell stage 

 only two of the four cells are in contact, the former being somewhat 

 oblique to the long axis. 



The egg membrane is a product of the egg itself, and probably 

 derived from the alveolar layer. In the young the appendicular 

 glands, opening through tubes between the claws are much larger than 

 in the adult and consist in great part of the coeloniic pouches. In con- 

 trast to the terrestrial tardigrades Macrobiotics macronyx does not revive 

 after desiccation. — F. D. Lambert. 



mi 



An abnormal chick.— In a brood of chicks there occurred one case 

 in which there was an opening in the abdominal wall on the right side 

 through which extended what seemed to be a loop of the intestine. The 

 loop ligatured above the ankle joint. 



