L.M.B.Cc. TURBELLABRIA. 155) 
remain firmly attached to its favourite weeds (species of 
Cerannum, &c.). These papille are elevations of the 
epidermis. The force of adhesion exercised by them, 
may be roughly estimated by using a powerful syringe. 
Repeated action of an in-going or out-going stream do not 
affect the Convoluta. It merely sways shghtly in the 
direction of the current without in the least loosening its 
hold on the substratum. This device is general among 
littoral Turbellaria ; some forms indeed (Planaria dioica, 
Claparéde) are provided with adhesive papille over their 
entire surface. 
Heggs of Convoluta paradoxa were found in orange 
clumps (80—40 in al clump) during July. Hach ege meas- 
ured ‘07 mm. in diameter, and owed its colour to the con- 
tained food-yolk. The adult (physiologically a female) 
becomes a tense bag of eggs which ruptures at the slightest 
touch. Young Convolute swim with great ease and 
rapidity, resembling in colour, form, and movement, the 
Copepoda associated with them. ‘They contain very few 
(4—8) zooxanthellz and are consequently of a much lighter 
colour than the adults. 
Convoluta paradoxa has been recorded from Firth of 
Forth, Berwick Bay, Guernsey, St. Andrews, Skye, Wey- 
mouth, Millport and Plymouth, and is generally distri- 
buted in northern and southern Huropean seas. 
5. Convoluta flavibacillum, Jensen (Pl. XII, fig. 4.) 
Occurred in tide-pools in front of the Port Erin Station 
during July. It is distinguished from the preceding species 
by its larger, more robust form, and the absence of zoox- 
anthellee. 
B. ReaaspocaLta:—Family MxEsostomipaé. 
6. Promesostoma marmoratum, Schlz (Pl. XII, figs. 8, 9.) 
This active littoral species appears to the naked eye as 
a fine whitish thread 1—1.5 mm. long. The body truncate 
