EGGS WITHOUT YELKS. 109 



463. A Hen's egg, invested in a strong fibrous shell-membrane, 



but without any shell. The albumen is drawn out into 

 a long twisted process at one pole of the egg. A section 

 has been made through the albumen to show its fibrinous 

 condition. Presented by Sir A. Carlisle, 1818. 



464. A similar specimen, in which both poles of the egg are 



prolonged. Presented by W. Clift, Esq., 1811. 



465. Two Hen's eggs without shells, but with a thick shell- 

 membrane, exhibiting small spots of calcareous deposit 



on the surface, united by a narrow pedicle. Hunterian. 



466. A similar specimen. 



Presented by W. B. Tegetmeier, Esq., 1867. 



c. Pseudo-Eggs, or Eggs without yelks. 



467. Pseudo-eggs laid by the Hen the oviduct and ovaries of 



which are preserved in preparation No. 456. The eggs 

 consist of normal albumen enclosed in a small but well- 

 formed shell. 



468. A small, elongated, curved, pseudo-egg from a Fowl, pro- 



bably deformed by abnormal contractions of the oviduct. 

 Presented by W. S. Pocklington, Esq., 1860. 



469. The shell of a similar pseudo-egg. 



470. The imperfectly calcified egg-shell of a similar egg. 



471. Two small pseudo-eggs, formed of concentric masses of 



fibrinous albumen and united by a long pedicle; they 

 are without shells. Sections have been made through 

 them to show their structure. 



472. The egg of a Bantam Hen, with two small masses of albu- 



men, which have descended upon it in succession, covered 

 with shell, and united by calcific deposit to its upper 

 extremity. 



d. Included Eggs or Pseudo-Eggs. 



Sometimes a small egg, or pseudo-egg, remains in the oviduct, 

 or, according to Mr. Tegetmeier, is carried back from the shell- 

 secreting into the albumen-secreting portion of the oviduct, and 

 becomes invested with a second layer of albumen and a second 

 shell ; or it is met by and invested in a second ovum ; in this 



