MÏSCE LTjÀNKOUS X OTES. 



63 



was carried on at the suggestion of Prof. Bbooks in the Biological 

 Laboratory of the Johns Hopkins University, and was undertaken 

 primarily with the object of settling the question as to the nature of the 

 so-called female gonophores of Haeckel, which are, however, regarded 

 by Bkooks and Conklin as swimming organs. The cpuestion is left 

 unsettled, as the writer has not observed any germ cells iti these 

 structures. Considering their muscular nature it is very possible that 

 these organs have really a locomotory function, as claimed by Brooks 

 and Conklin. If this is the case, then we know nothing yet about the 

 females of Physaliu. 



The so-called female gonophores are provided with a ring-canal and 

 four radial canals. The manubrium is present as a simple protuberance 

 of the ectoderm in the centre of the subumbrellar cavity. The bell- 

 nucleus is formed by the wandering in of interstitial cells from the 

 ectoderm. 



Male gonophores were also studied, and the wandering of germ 

 cells observed. These take rise from the endoderm cells of the young 

 bud and wander out one by one into the subumbrellar ectoderm. The 

 germ cells have no distinct membrane, so that they appear imbe dded in 

 a common mass of protoplasm. The cells of the subumbrellar ectoderm 

 are comparatively few and are, as in the so-called female gonophores, 

 the cells that have wandered in from the ectoderm, as described in a 

 preliminary note published elsewhere (Johns Hopkins Univ. Circulars, 

 no. 119). 



The male gonophores have two radial ca.nals when young ; the 

 mature ones are, however, entirely destitute of them. 



S. Goto. 



On the Fate of the Blastopore, the Relations of the Primitive 

 Streak, and the Formation of the Posterior End of the Embryo in 

 Chelonia, together with Remarks on the Nature of Meroblastic Ova 

 in Vertebrates, by K. Mitsukuri. Contributions to the Embryology 

 of Reptilia, V. Jour, of the College of Science, Imp. Univ., Tokyo. 

 Vol. X, Pt. I, p. 1-118. PI. I-XI. — In early stages of Reptilian embryos, 

 there is always an area free from the epiblast, directly behind the bias- 



