20 Prof M'Intosh's Notes from the 



fragments of shells, and the elastic anterior end closes when 

 the branchiae are withdrawn. 



The absence of Spirographis spallanzanii, Viviani, from 

 the l^ritish area, is noteworthy. It may yet be found in the 

 Clianncl Islands or on the southern shores of England. 

 It occurs on the opposite shores of France. 



In Bispira volutocornis, Montagu, the seventh species, the 

 general colour is of a yellowish brown, paler in front dorsally 

 and on the ventral surface. The branchiae are pale buff 

 with a white (interrupted) border to the filaments, the tips 

 being more or less white. Most of the filaments have a pair 

 of eye-specks, but there is no regularity in their arrange- 

 ment in the mass, and some have two pairs or an extra 

 spot. Some of these specks are at the base of the white 

 tip, others midway or above the basal insertion. Though 

 not so 'orilliantly tinted as some species, the delicate shades 

 of fawn and the pure white marjiins and tips, in addition to 

 the eye-specks, give the branchial fans great elegance. 

 The tips of many of the filaments appear to have been 

 injured, and are in process of reproduction. In the living 

 form the dorsal groove presents a Avhite bar at the edge of 

 the collar, whilst a brown fillet occurs at each side and passes 

 under the large lateral brown fiaps bordered with white, 

 and the dorsal edges of which are continuous with a slight 

 ridge on each side of the anterior region. Veutrally the 

 deep purplish-brown collar with its border of pure white is 

 stretched continuously across till it passes in front of the 

 lateral flap. Dorsally and ventrally the anterior region is 

 somewhat paler than the rest, the lateral region, however, 

 being slightly darker — as, indeed, it is all the way backward 

 till near the tip of the tail. Ventrally the scutes are buff 

 (pale brownish) and marked by the coprogogne, which turns 

 to the right at the posterior border of the anterior region 

 and passes dorsally. In an example the segment in front 

 ventrally was entire, but the one anterior to it was split as if 

 it had a coprogogne of its own. "Young forms are pale 

 greenish, the branchiae being pale, and only a little border of 

 white and a tew touches of brown are visible ventrally at 

 the collar, which has a deep median fissure. Dorsally none 

 of these hues are present, the rudimentary flaps being pale. 

 The great development and pigmentation ot these flaps is 

 an adult feature. 



When the branchiae are removed from the cephalic plate, 

 the dorsal groove abuts on two semicircles of firm tissue, 

 which pass downward to the sides of the mouth. From the 



