34 



This form possesses a very thin cuticle and flat spicula. The latter are represented in 

 fiif. 173. The spicula of the body-wall are extremely minute, flat and more or less heart-shaped 

 with a thick border, imbricated (A). Amongst these, though less numerous, spicula of shape 

 B occur; spatula-shaped with border, or curved needles bluntly terminating. Along the ventral 

 groove long spicula (C) are met with, which may also be flat, being in that case provided 

 with a border. On the white rings no special spicula are observed. These shapes may be 

 compared with those of Stylomenia Salvatori (Pruvot 10 fig. 3) and Dondersia festiva 

 (HuBREciiT 3 fig. 2). Papillae are entirely absent. 



There are 3 extremely minute dorso-terminal sense-knots, looking like small elevations, 

 which may be retracted or protruded by fine muscular fibres (figs. 178, 179 c/s.). 



The "Flimmerhohle" is small. In the proximal part the "vordere Bauchdrlise" occurs: 

 large transparent fibrillar glandular cells: the "hintere Bauchdrlise" which is much more developed 

 and also met with along the ventral groove, has small cells, staining bright transparent red 

 with carmine. The ventral groove, which runs as far as the cloaca, contains i large fold. 



What has been observed with respect to Dinomenia Hubrechti and Rhopalomenia 

 aglaopheniae holds good for this animal, viz. the mouth-cavity and the opening of the pharynx 

 are separated from each other, a separation much more complete than in the before-mentioned 

 species. In fig. 172 at w is the opening of the mouth-cavity; the name of mouth-cavity is justified 

 on account of its carrying similar organs (cirrhi and "Mundleisten") as the mouth-cavity of the 

 other Neomeniidae. Fig. i 74 shows a transverse section through the proximal part of the body ■, 

 the mouth-cavity is distinct; in the section fig. 175, which is a more distal one, the mouth- 

 cavity is still visible (/;/. c.) whereas the opening of the pharynx is also visible. 



The pharynx is a straight tube with a strongly folded wall, encircled by a strong circular 

 muscular layer; numerous unicellular glands, which may form a compact mass, surround it 

 (fig. 176, /._^.). There are 2 tubular salivary glands {s. £-.) which take a winding course, and 

 only extend a little distance distally (0.3 mm.). They are short tubes which unite, open out 

 into the ventral part of the pharynx close before the radula, and are surrounded by unicellular 

 glands, the contents of which are discharged into them. These glands cannot be distinguished 

 from those of the pharynx, as is also the case with Dondersia festiva (Hubrecht 3, figs. 10, 11). 

 In Dondersia festiva and Stylomenia these salivary glands are likewise met with. 



The radula, which is exceedingly small, is found somewhat more distally and consists of 

 a few (4?) conical teeth, situated behind each other. Fig. 177 shows such a tooth, strongly 

 enlarged; as they arc placed in a slanting line, the part /^ may be considered as the pedicle 

 of the following tooth, a being loose. The radula-sac is also very small, whereas any special 

 muscles and cartilaginous cells are absent. A similar radula is only met with in .Stylomenia 

 Salvatori and Dondersia festiva, though the data of the latter are insufficient. 



The part of the pharynx, next to the radula is not distinguished from the preceding 

 portion in any respect and must therefore also be called pharynx ; an oesophagus is absent. 

 The pharynx unites with the proximal coecum and these form together the wide intestine, which 

 is provided with regular coeca (fig. 178). 



On comparing the nervous system with that of Stylomenia we observe the following 



