io6 FOLLICULAR DERIVATIVES IN VERTEBRATES Til 



/3. The post -ovulation corpus luteutn solidum is charac- 

 terized by the complete organization of the folUcular cavity, 

 after ovulation, into a solid gland: in mammals, the corpus 

 luteum graviditatis. The hormone-secreting tissue consists, 

 according to the species of animal, either exclusively of 

 granulosa- or of both granulosa- and theca-lutein cells 

 (Fig. 74b). 



7. In the post -ovulation corpus luteum mixtum the theca 

 also hypertrophies into lutein cells; during the organization 

 of the gland this tissue mixes with the granulosa to form a 

 functional whole (Fig. 74c). 



d. The Elephantulus type, being a transition between 

 both corpus luteum types, may also be regarded as a post- 

 ovulation corpus luteum with temporary retention of the 

 ovum, rupture of the follicle occurring at a much later stage 

 (Fig. 74e). 



s. Finally, in this type, too, liquor- and lymph-pressure 

 may lead to an incompletely organized lutein cyst after the 

 ovulation-pore has closed up again (Fig. 74d). 



Owing to the glandular character of these three groups, 

 there is a well-developed system of bloodvessels and a certain 

 degree of hyperaemia, caused also by pituitary agents. In 

 many cases this may be so marked as to set up discharge of 

 blood stamping the follicular derivative in question as hae- 

 morrhagic body. Wc know up to the present: the folliculus 

 haemorrhagicus; the corpus atreticum haemorrhagicum and 

 the pre- and post-ovulation corpus luteum haemorrhagicum, 

 all of which, as so-called "bloodpoints" in the ovary, have 

 engaged the attention of other writers (AsCHEIM-ZONDEK 

 reaction) . 



d. Modifications of the calyx type. 



The "calyx" denotes the ruptured ovum-less follicular wall 

 showing no tendency to gland-formation. 



a. The calyx simplex represents the most normal form, 

 in which, after rupture, the granulosa degenerates and is 

 expelled, the remaining theca tissue closing up the ovary wall 

 with granulation tissue (Fig. 75a). 



