46 JOURNAL OF THE [April, 



confirmed by the deposition within three or four days of several 

 clusters, containing from four to eighteen eggs each (Fig. la). 

 These I carefully watched, and after some days observed : 



1. The dense contents gradually assumed a mulberry shape 

 (Fig. 1^), and then there set in a rapid revolution of the cell con- 

 tents. 



2. A development of a rotifer-like form (Fig. i^ with two 

 strongly ciliated heads, always in motion, but still within the egg. 



3. The rotifer-like form escaped (Fig. id) and became a free 

 swimmer. It now had a kind of tail in process of development. 



4. The ciliated heads disappeared, and attached by the tail 

 it assumed the form shown in Fig. le. 



Unfortunately, I am not able to devote continuous observation 

 to my specimens, hence my uncertainty ; but I have further seen 

 what I believe to be developed from Fig. le — a form (Fig. i/) 

 with one pair of processes, and another with three pairs, my first 

 specimen having six pairs. 



LaGOTIA CiERULEUS sp. n. (PI. 29, Fig. 2). 



Figure 2 must undoubtedly be referred to the genus Lagotia 

 "Wright described in " Pritchard's Infusoria," and figured on Plate 

 ,31, Figs. 7-13. His description of L. producta is as follows : 



" Neck of sheath exceedingly prolonged, annulated sheath of a 

 pale yellow-brown color. Animalcule (= zooid) two or three 

 times the length of the sheath, attenuated ; ciliated lobes erect, 

 divergent, and re-curved at tips ; color of zooid, deep blackish- 

 green. 



" Dr. Wright observed the development in this species of ciliated 

 embryos, which, after passing through the stages seen in Figs. 

 2 a, b, c, and carrying on an active existence as free ciliated ani- 

 mals, form an attachment to some surface, and proceed to 

 develop a sheath and the characteristic ciliary lobes. The 

 transformation from ciliated embryos to Lagotia producta trans- 

 pired in the course of a night, the sheath even during that time 

 being completed with its rings." 



I have given Dr. Wright's history of Z. producta, as it is the 

 nearest to L. C(zruieus, and answers for it with the following ex- 

 ceptions : Z. ccBruleus is of a delicate blue throughout — sheath 

 .and body ; producta sheath " pale yellow-brown ; body, blackish- 



