458 REPORT ON ZOOLOGY, MDCCCXLIV. 



tlie fimdus of the uterus are fertilized, but cannot satisfy 

 himself that the peculiar corpuscles accumulated at the 

 fimdus uteri, and which we explained as Spermatozoa, are 

 such. Kolliker describes these corpuscles, which he met 

 with in Ascaris dent at a, acuminata, Stronyylus auricularis, 

 dentatus, and Oxyuris ambiyua, as immature seminal fas- 

 ciculi or undeveloped spermatic cells, which have been 

 ejaculated together with the mature semen into the 

 female organs. He adds, hereupon, that the cells dis- 

 covered by us in the fundus uteri of Ascaris acuminata 

 precisely resemble the cells in the testicle of the male. 

 Kolliker also found in Oxyuris ambiyua precisely similar 

 nucleated cells, both in the testes and in the fundus uteri. 

 But since Mayer (neue Untersuchung. a. d. Gebiete d. 

 Anat. u. Physiol. p. 9) observed the spermatic filaments, in 

 the female Oxyuris vermicularis, ^ of a line in length, in a 

 curved form, with acuminated extremities lying scattered 

 amongst the ova, Kolliker sees the greater reason for 

 regarding these cellular corpuscles in the sexual organs of 

 nematoid females as fasciculi of undeveloped Spermatozoa. 

 In Oxyuris ambiyua Kolliker recognised, at the uppermost 

 extremity of the testes, spherical cells, 0-0030 "' in size, all of 

 which presented a nucleus with a round nucleolus. These 

 cells became altered, the further they were removed from the 

 extremity of the testicular sac; they became elongated and 

 produced on one side into a long point ; their nucleus with 

 the nucleolus gradually disappeared ; in short, the spherical 

 cells were finally transformed into a lengthened caudate, 

 homogeneous, pale body, in which no distinction between 

 the contents and the envelope was any longer apparent. 

 These bodies Avere sometimes straight, sometimes of a cre- 

 scentic or serpentine form, - 014'" to O'OIS'" long, and 

 occasionally exhibited longitudinal stria? ; on which account 

 Kolliker considered them as fasciculi of spermatic filaments. 

 Similar undeveloped spermatic cells (testicular cells) were 

 observed by Kolliker also in Trichocephalus dispar, nodosus, 

 Stronyylus auricularis, and Ascaris acuminata. But Kolliker 



