432 Mr. C . W. Peach on the Luminosity of the Sea, 



had not the motion of the water attracted my notice ; the for- 

 saken umbrella jerked about — the deserter luxuriated in his 

 liberty and appeared to make good use of it. I watched it for a 

 long time, till the " wee short hour ayont the twal," told me a 

 tale, and I unwillingly left it well supplied with water ; but when 

 I rose in the morning, it had only " left a wreck behind " of small 

 granules inactive and dead. The size of these objects never 

 exceeded the sixth part of an inch ; they were generally smaller ; 

 some were specks. At times the above were most abundant, 

 but invariably vanishing after strong gales, especially when ac- 

 companied by lashing rain or thunder. 



Fig. 13 will be seen to have its ova in an inverted position, 

 the tube being below the umbrella instead of in it ; fig. 14 had 

 two jelly-like appendages (umbrella- or bell-shaped) and was 

 extremely active. I have seen three or fom' specimens some- 

 thing like the latter. 



These departures from general form may have arisen from 

 ruptures by injuries, and although their activity was not de- 

 stroyed, their known tenacity under injuries will account for 

 their vivacity. 



Plate XIII. Figs. 1 to 4, Diphjdia. It will be seen that 

 the appendages are much more developed in figs. 1, 2, 3. Fig. 4 

 appears to have thrown off" many of the grape-like parts, and by 

 some means the bell part has become inverted, and the comb- 

 like appendages are all upon one long filament, showing that in 

 all probability there is a continuous connexion between these 

 even when the tail is laden with the clusters, and that the fila- 

 mentary thread is concealed amongst them, and is of sufficient 

 tenacity to resist the tearing off" of the clusters. An examina- 

 tion of the more highly magnified figs. 2 a, 3 a, shows part of 

 the tails of figs. 2 and 3; and there are between the clusters of 

 ova connected with these, bars which may be seen on each side, 

 also bent and needle-like objects sharp at both ends. The stem 

 of fig. 3 a is wrinkled like the windpipe ; on each side of it a 

 double line passes, stouter and more strongly marked than the 

 internal part. The larger parts of the ovarian appendages (and 

 these assume two or three diff'erent shapes) have a hyaline ap- 

 pearance, and that beautiful cloud-like arrangement which may 

 be seen in opal when light is reflected through it, and as if made 

 up of countless granules. 



Fig. 2 has the comb-like appendages altogether wanting. 



Fig. 3 shows them very abundant. 



Fig. 4, with them left when nearly all the ovarian parts are 

 gone and the umbrella inverted. 



Fig. 3 b, the back part of one of the comb-like objects. 



Fig. 3 c, side view of the same. 



Plate XIV. Figs. 1 & 1 a. play a conspicuous part very often 



