LOXOSOMA LOXALINA AND LOXOSOMA SALTANS. 143 
Fig. 16. — L. saltans. A section of tlie second on the same animal 
showing the ectoderm cut through on one side. These organs appear 
to be easily lost. 
Fig. 17. — L. loxalina. Diagram of similar ectodermal organs on 
the species L. loxalina, in which they are never pedunculate, (a) The 
organ next the stalk ; (b) any of the others. 
Fig. 18. — L. saltans. Sections which illustrate the structure of the 
tentacles. Each consists of a core of mesodermal cells, a single row, 
and a coat of ectoderm of which the innermost are ciliated. Sense- 
hairs are borne by some of the outer cells, but these are not shown in 
the figure. 
Fig. 19. — -L. saltans. A figure drawn from a living specimen with 
tentacles retracted, showing the way the four large ones bend over the 
smaller lateral ones. The colour of the various parts of the alimentary 
canal are shown. The kidneys are also very slightly yellow, biit these 
are not shown in the drawing. 
Fig. 20. — L. saltans. A figure of a living specimen after twenty- 
four hours in sea-water containing a weak solution of methylene-blue. 
The parts brightly coloured are the young growing tissues, especially 
the ectoderm of the buds, the central neiwous system, and the latei'al 
walls of the rectum. 
Fig. 21. — L. saltans. Another specimen which had been in sea- 
water with methylene-blue for some hours. The coloured parts are the 
kidneys, the rectum (also excretory), and a chain of cells along the 
dorsal wall of the stalk. 
Fig. 22. — L. saltans. Two cells of the liver-like diverticula or 
thickening of the alimentary canal. 
Fig. 23. — L. saltans. Two cells of the pancreatic diverticulum of 
the gut, and one ciliated cell of the “ stomach ” region. 
Fig. 24. — L. saltans. A section through the rectum stained with 
thionin, orange G, and eosin. The dorsal and ventral walls are ciliated. 
The latter walls are composed of excretory cells. The excretoiy pro- 
ducts are seen collecting in the large vacuoles. 
Note. — The specimens of L. loxalina were all fixed in Perenyi. 
Those of L. saltans in Flemming's or Hermann’s fluid. 
