Videnskabelige meddelelser

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Videnskabelige meddelelser

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posterior end, but no true bulb is formed. The nerve-ring is in-

distinct. Ventral gland present; also unicellular glands are found

with Short chitinized, tubular canals penetrating the cuticle like

those known in Aphanolaimus aquaticus and in the Halaphano-

Iciimus pellucidiis, described by Southern; they are only few in

number, I have with certainty seen but two.

Female organs symmetricai, vulva is a short distance behind

the middle of the body. Uterus contains only a few eggs. The

spicules are strongly curved and expanded proximally. Accessory

piece with a backwardly projecting prominence.

Trigonolaimus armatus n. sp.

Fl. VIII. figs. 1. 4. 15. 7.

Little Belt; off Middelfart, c. 30 m.

— off Lyngs Odde, c. 20 m.

The Sound; Hellebæk S.E., 12— 14 fms.

— off Hellebæk, 12—14 fms.

The body is elongate, rather uniform in width. Near the front

end it tapers gradually; the head is rounded. In the posterior part

the body keeps its width to the anal region. The tail is short,

conical, with rounded tip.

The cuticle is rather thin and smooth. Females as well as

males keep the tail somewhat incurvate. The front end has two rings

of bristles, those in the foremost ring are the largest (PI. VIII, fig. 4).

The buccal cavity is large and rather deep with thickened

chitinous walls; in transverse section it forms a triangle and the

shape is like a threesided pyramid placed on its top. In the fore-

most part of the buccal cavity is found a number of stout, slightly

curved chitinous rods arranged in a bundle with their tips pointing

cephalad. Some chitinous, prismatic bodies are arranged in a ring

outside of the named bundle. The number of the prismatic bodies

is, as far as I have been able to ascertain, the same as the number

of the rods, 6 in all. These rods can be protruded through the mouth

and turned out in such a manner that their longitudinal axis is

placed vertically to the longitudinal axis of the body and their

slightly curved tips point backwards. In this position the rods are

arranged like spokes in a wheel and the mentioned prismatic bodies

are placed one behind each rod and supporting it (PI. VIII. fig. 6).