304 Miscellaneous. 



Otomys Jacksoni, sp. n. 



Allied to 0. irroratus, Bts., but with two deep grooves down each 

 lower incisor instead of only one. Basal length of skull 31*4 

 millim. 



Hab. Mount Elgon, 13,000 feet. Coll. F. J. Jackson, Esq. 



lihizomys annectens, sp. n. 



Intermediate in size between R. macrocephalus and R. splendens; 

 externally very similar to both. Basal length of skull 51 millim., 

 as compared to 63 in the first, and 41 in the second of the allied 

 species. 



Hab. Either Masai-land or inland British East Africa. Coll. F. J. 

 Jackson, Esq. 



Cervicapra Clarkei, sp. n. 



Smaller than 0. bohor, Kiipp., but the horns longer, slenderer, and 

 less curved. Skull light and delicate, flattened from above down- 

 wards ; lacrymal fossse present, although very shallow ; lower jaw 

 excessively weak and slender. 



Length of skull (occiput to gnathion) 210 millim. ; height (crown 

 to angle of lower jaw) 94 millim. ; length of horn, round curve, 

 anteriorlv, 245 millim. 



Hab. Northern Somali-land. Coll. T. W. H. Clarke, Esq. 



New Researches on the Spores of Myxosporidia {Structure and 

 Development)*. By M. P. Thelohan. 



At the present time we possess but very few definite notions as to 

 the phenomena of sporulation in Myxosporidia. The observations 

 made by Balbiani f , Biitschli J, and Gabriel § have, it is true, deter- 

 mined the general course of the development of the spores ; but 

 many details yet remain to be elucidated, especially with reference 

 to the development of the polar capsules. 



We know that the nuclei of Myxosporidia are localized in the 

 endosarc, where they exist in very large numbers. The first stage 

 of the formation of spores consists in the differentiation around one 

 of these nuclei of a little sharply-defined sphere of plasma, which 

 appears to be encased in a delicate envelope resulting from the 

 condensation of the peripheral layer. 



"We next observe this nucleus divide by karyokinesis. I have 

 6een, among other figures, a spindle with absolutely typical equato- 

 rial plate, so that not the slightest doubt could exist. 



* Carried out at the laboratory of Prof. Balbiani, at the College de 

 France. 



t Balbiani, ' Lecons but les Sporozoaires,' 1884. 



\ Biitschli, " Beitrage zur Kenntniss der Fischpsorospermien," Zcit- 

 schrift fur wiss. Zool. 1881 ; Bronn's Thier-Reich, Bd. i., Protozoa. 



§ Gabriel, Berichte der Rchles. Gesellsch, f. d. J. 1870. 



