190 is open on one side (caudad); the shape is plainly seen in fig. 9. PI. IX. The æsophagus is somewhat expanded in front and with its musculature it embraces the largest part of the buccal cavity ; for the rest it is of the same width and forms no bulb. The cells of the intestine ara small and contain several pigment-granules. Ventral gland seems to be lacking. Vulva is found somewhat in front of the middle of the body. The ovaries are symmetricai and relatively short ; they are re- flexed and the tips of the reflexed branches almost touch one another in the neigbourhood of the vulva (PI. IX, fig. 6). Vaginal glands are not seen and vulva is very little prominent. Only one testis is found. The spicules are slightly curved, ex- panded in their proximal end and provided with a short, longitud- inal list. Also in the distal end is seen a dilatation. The accessory piece is of a rather peculiar aspect. It consists of a dark, almost black, opaque chitinous mass; it embraces the tip of the spic- ules and is provided with two backwardly projecting apophyses; on each side is found a prominence not visible in the figure. The accessory piece is very predominant in proportion to the spicules which consist of a colourless, highly pellucid chitinous mass. Fem a I e Male. Length: 3,.i mm. 2.7 mm. (C ^= 4\ri- r< -^ 41,
191 The buccal cavity is considerably smaller than in M. inermis. In this species it measures in length more than 50 fi while in the species under consideration it only makes 19 //. It is divided in two parts, one behind the other, but in M. gracilis the foremost part is relatively much larger than the corresponding part in the foregoing species, and besides it differs somewhat in shape. It is not funnel-shaped, the longitudinal walls being parallel, so that it can rather be called cylindrical, or more cylindrical than funnel- shaped. The hindmost part is globular as in M. inermis. Also in the species in question are seen some minute teeth, but only in the hindmost part of the buccal cavity. Caudad for this, at the entrance to the æsophagus is seen a large tooth-like prominence, a faet which calls to mind the fresh-water form Trilohns (jracilis. The lateral organ has quite the same shape as in M. inermis, but it is smaller and its place is more caudad (PI. IX, fig. 3). The æsophagus is cylindrical and expands but very slightly to- wards the posterior end. The intestine is crowded with refringing granules. Vulva is found in front of the middle of the body. Female organs symmetricai, ovaries reflexed. No vaginal glands. Length: 2,.-, mm. K -= 52. /S ^=: 8,."). ;' - 15,(5. Chromadora Bastian. Chromadora poecilosoma de Man. 1893. Chromadora poecilosoma de Man, Cinquiéme note &c. p. 16. Little Belt; — off Snoghøj, c. 30 Kongebro, shallow m. water. Two females and one male were taken. Chromadora maculata n. sp. I'l. X. fin. 3: l'l. XI, li-s 2. .'). Little Belt; off Lyngs Odde, c. 10 m. Only one specimen was found, a female of a length of 2,o mm. It has been impossible to refer it to any of the known species of this genus. The shape of the body is rather lengthened, like that of Emhromadora viilgaris; it only tapers very slightly in front, in the posterior part it keeps its width almost to the anal region.