KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 39. N:o l. 69 
amd lower transversal furrows. HEach field is provided with one or more glandular 
bodies, which are marked by the presence of minute holes or rather pores, visible 
under a low manifying power (Figs. 38 and 40). Considering that the pores are 
not seldom located on the top of minute elevations, which depends upon different 
degrees of contraction, the skin acquires in such places a granulated appearance 
(Fig. 38). In macerated specimens the skin with its glands presents an aspect like 
that in Figs. 42—43. 
The muscular system of the body-wall, like that in Ph. Hanseni and margarita- 
ceum etc., is formed by continuous layers. The interior surface of the body is lustrous 
like mother-of-pearl. Four retraector-muscles, the ventral ones being attached the 
body-wall with broad bases. Two free segmental organs. The intestinal spiral re- 
sembles that of the two forms just mentioned. In a smaller, less damaged individual 
I counted about 19 twists, running downwards and as many running upwards. A 
contractile vessel present. The spindle-muscle, well developed, is not attached to the 
posterior extremity of the body. The rectum is fixed to the body-wall by strong 
muscular ligaments. There 18 a long and rather considerable fixing-muscle inserted 
on the gullet, and traces of some others may be observed. 
Phascolosoma Trybomi n. sp. (?). 
PJ. II. Figs. 15—18, Pl. XIII. Fig. 189. 
Body cylindrieal, tapering towards the ends, its posterior extremity pointed. 
Skin rather smooth, firm though not very thick, covered with more or less erowded 
minute granules visible under a low magnifying power, each granule pierced by a 
pore. Interior surface of the body-wall lustrous, iridescent. Colour light dirty brown. 
Tentacles about 100, arranged, as it seems, in ten groups round the oral disk. Hooks 
absent. Retractor-muscles four, the two ventral attached to the anterior part of the 
median third of the body, the two dorsal arising about 7 mm. behind the anus. Ge- 
nital festoons present at the bases of the-ventral retractors. Two free segmental or- 
gams opening exteriorly, slightly in front of the anal aperture. A simple contractile 
vessel present. Intestinal spiral composed of 60 double twists and provided with a 
powerful spindle-shaped muscle, which is wunattached posteriorly. There are three 
fixing-muscles, one inserted on the gullet and the other on the twists in the neigh- 
bourhood of the rectum, which in its turn is strengthened and fixed by powerful 
muscle-bundles. 
Length from the anus to the posterior extremity of the body = 100 mm. 
Length from the oral disk to the anus = 45 mm. OConsidering that the proboscis 
is contracted and retracted, the latter distance may probably be greater. The grea- 
test diameter about 7 mm. 
Habitat: 
The Sound, between Hellsö and Långö, 6—12 fathoms (TRYBOM), a single specimen. 
At first sight, chiefly on account of the colour, I supposed that the animal in 
question was to be referred to the vulgare-group, to which it bears a certain resem- 
E. Sv. Vet. Akad, Handl. Band 39. N:o 1. ? 
