222 



It is to be remembered that it is the left oviduct which is aborted 

 in Aaniella, while in birds it is the right which has degenerated 

 even more completely. In numerous reptiles the left oviduct is shorter 

 than the right, but so far as we can learn retains its normal functions 

 in all lizards except Anniella. 



Other than these peculiarities of the oviducts, the female uro- 

 genital organs show no noteworthy deviations from the type found in 

 Anguis and related forms. The kidneys are as in other lizards 

 (Fig. 1, 2), the ureters opening into the dorsal portion of the anterior 

 cloacal chamber lateral to the oviducal papillae. Remains of the 

 Wolffian bodies persist as a pair of distinct adrenal bodies (Figs. 1, 2 ad); 

 the Wolffian ducts likewise persist in the adult, although the lumens 

 become obliterated posteriorly; the urinary bladder {U) is long and 

 narrow, and opens on the ventral side of the cloaca, and in some 

 score of individuals was found to be entirely empty ; conspicuous anal 

 glands are arranged in two groups, of which one group forms a 

 secretion differing materially from that formed by the other. 



The copulatory organs (phalli) are developed in both sexes as 

 conspicuous appendages projecting externally from the lateral borders 

 of the cloacal aperture. In the mature embryo they have a curious 

 resemblance to a pair of rudimentary limbs. In both sexes they are 

 invaginated at the time of birth and withdrawn into post-cloacal 

 pouches. In the male they continue to develop up to the time of 

 sexual maturity. In the female, however, although they are retained 

 throughout the life of the individual, yet they cease their growth 

 soon after birth. 



Nachdruck verboten. 



Suir esistenza di un tessuto mieloide differenziato negli 

 animali inferior!. 



Nota preliminare del Dott. Carmelo Ciaccio. 



Ehrlich senza dubbio fu il primo a sistemare i diversi elementi 

 morfologici del sangue ed il loro luogo di origine: secondo questo 

 autore alio stato adulto gli organi emopoietici vanno distinti in due 

 grandi categorie: 



1" Organi a tessuto linfoide (glandole linfatiche e milza), i quali 

 danno origine ai leucociti mononucleari non granulosi. 



2" Organi a tessuto mieloide (midollo osseo), da cui traggono ori- 

 gine i leucociti polinucleari granulosi e le emazie. 



