BORLASIA ELIZABETHS. 193 



Genus VII. — Borlasia, 1 Oken, 1817. 



The genus Borlasia was formed by Oken in his ' Lehrbuch der Naturgeschichte' for the 

 previously named Lineus marinus of Montagu, and therefore very properly was disused in that 

 instance. Instead of applying the title to represent forms belonging to the Enopla, as Prof. 

 Keferstein and others have done, I have chosen rather to bestow it on the present new type 

 of the Anopla, a type, indeed, not far removed from that to which the name was originally 

 given. 



Generic character. — Body round and massive, not tapered posteriorly. Snout acutely 

 pointed. Proboscis extremely slender, furnished with elastic external, longitudinal, circular, and 

 glandular coats. There are no accessory bands at the poles in transverse section. Circulatory 

 fluid and muscles tinted reddish. 



Borlasia Elizabeths, n. s. Plate VII, figs. 1 and 2. 



Specific character. — Eyeless ; snout much tapered anteriorly. Posterior part generally 

 contracted into a thick rugose mass. Head pale, faintly streaked with greenish brown ; body 

 mottled with deep madder-brown. 



Habitat. — In a pool near low- water mark to the north of Rat Island, Herm. 



Body. — About a foot in length and a fifth of an inch in breadth, rounded in extension, flattened 

 in contraction, tapering towards the snout, and also slightly towards the tail, which ends bluntly ; 

 indeed, the posterior end generally forms a dilated mass with a dimple in the centre, and coarsely 

 marked by transverse wrinkles. The body is seldom free from numerous longitudinal furrows, 

 which are especially distinct anteriorly. 



Colour. — The head throughout two thirds of its length anteriorly is pure white, with 

 olive-green specks ; for rather more than the posterior third, however, the deep purplish-brown 

 and white touches of the dorsum occur. The speckled dorsum is marked at somewhat regular 

 intervals by belts of pinkish white, which entirely surround the body. Some of the pale rings are 

 broader than others, but there does not seem to be any regularity in this respect. They continue 

 to the tip of the tail, but gradually grow faint posteriorly. The colours are brightest anteriorly, 

 the greater part of the body being of a speckled olive-brown hue. A very slight reddening is 

 noticed over the ganglionic region. The pale olive specks of the snout pass into the anterior part 

 of the cephalic fissures, while the posterior end of each is deep red. The snout continues pale to 

 a similar extent ventrally, while the olive-green specks are few and indistinct. The ventral 

 surface of the body generally is somewhat paler. Captivity does not seem to affect these hues 

 very soon. 



Head. — Not distinguished posteriorly from the rest of the body, except in certain positions, 

 when the slight elevation of the posterior fold of the cephalic fissure indicates a separation. It tapers 

 rather abruptly to a somewhat narrow tip, furnished with a central papilla. Prom the angle of 

 the tip on each side a deep lateral fissure runs to the posterior border of the snout, where 



1 In honour of the Rev. W. Borlase, the natural historian of Cornwall. 



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