ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 59 



Gregarines. Within the cyst, one of the two Gregarines gives rise to 

 flagellate gametes (spermatozoa), and the other to clear spherical ova. 

 In fact, in a normal cyst there is a male and a female Gregarine ; and 

 the observer describes the differentiation and (anisogamous) conjugation 

 of the gametes. A very remarkable fact is that the flagellate gamete — 

 so-called spermatozoon — is relatively large, and bears with it the great 

 part of the nutritive reserve, while the spherical gamete— so-called 

 ovum — is much smaller, and with much less nutritive material. It 

 seems like a strange by-path in the evolution of sex. 



Two New Hsemogregarines from Fishes. * — A. Laveran and F. 

 Mesnil report the discovery of Hsemogregarina simondi sp. n. from the 

 sole (Solea vulgaris) and H. bigemina sp. n. in blennies (Blennius pholis 

 and Bl. gattorugine). Hitherto the recurrence of true Hsemogregarines 

 in fishes has been rather doubtful, but the two forms described and 

 provisionally figured are in many ways like known Haemogregarines, 

 especially H. ranarum and H. stepanoivi. As with all other Haemo- 

 gregarines, the source of infection is in the above cases unknown. 



* Comptes Kendus, cxxxiii. (1901) pp. 572-7 (2 sets of figs.). 



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