Videnskabelige meddelelser

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Videnskabelige meddelelser

188

There are three caudal glandular cells the contents of which

after Southern ..are long and slender interwoven filaments pre-

senting a characteristic appearance". I have not succeeded in ob-

serving these filaments in my specimens; perhaps my method of

preservation has destroyed their peculiar structure.

V'ulva is some distance behind the middle of the body. In a

female, measuring 5.i mm. the exat place of the vulva is 2,t4 mm

behind the frontend. The ovaries are symmetricai and reflexed.

The spicules (PI. XI, fig. 1) are slightly curved, expanded in the

middle and provided with a rather streng longitudinal list reaching

from the tip two thirds of the length of the spicule : its shape

is rather different from that of D. ininor figured by Southern; in

its proximal end is found a little prominence to which the pro-

tractors are attached. An accessory piece of apparently rod-like shape

is present.

The main differences between the Danish species and D. minor

of Southern can be pointed out in the following manner: D.

ininor has a length of 3.5 mm. D. gracilis attains more than 5

mm. The tail of D. gracilis is more acute than that in D. niinor.

The spicules are of rather different shape in the two species. The

Danish species seems to be more stout in shape. the tail perhaps

somewhar longer.

F e m al e. Male.

Length: 5.:

fi = 31.

mm.. 4.k mm.

(C = 35.

/i = 7,3. /? = 6,9.

;- = 30,9. ;- = 20.4.

Macrolaimus n. g.

.Anguillulidæ of moderate size; body rather lengthened and

slender. The cuticle is thin and smooth. The front end are sur-

rounded by two rings of bristles: in the foremost ring are seen six,

rather small, setæ ;

the hindmost consists of only four stout brist-

les of a length twice those in the foremost ring. The buccal cav-

ity (PI. IX, fig. 9) is very large with thin, chitinous walls; it is

divided in two parts, one behind the other. The foremost part is

the larger; it is funnelshaped and at its base are found some

minute teethlike prominences. The hindmost part is globular and

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