iS 



i" The radula of Proneomenia australis is biserial, not distichous, the radula-teeth are rather 

 straight, long and conical; these forms I do not meet in Dinomenia verrucosa. 



2° The salivarj glands in Proneomenia australis are long tubes, situated ventrally from the 

 intestine. A peculiar condition like that ot Dinomenia verrucosa is not mentioned by Thiele. 



; l'hr cuticle of Dinomenia verrucosa shows very conspicuous prominences, also occurring 

 in young specimens. 



To me all these seem to be sufficiënt points of difference to consider these animals a new species. 



When afterwards the very incomplete account of Thiele has been replaced by more accurate 



information, it wil) be seen, whether this view is correct or not. 



Xo doubt this species, as well as the preceding, is related to Proneomenia on account 



of the structure of the integument, but is also related to Paramenia on account of the 



distichous radula. Nothing prevents us trom arranging this and the preceding form under one 



genus. The presence of copulation-spicula in only one of both species does not interfere with 



this arrangement : Proneomenia presents a similar difterence. 



Proparamenia nov. gen. 



Length-index 12 — 20. Cuticle thick with many layers of pointed spicula and with 

 numerous papillae. Dorsal sense-organ absent. 3 Ventral fokls. A circlet of gills in the cloaca. 

 No copulation-spicula. Radula monoserial. 2 Ramified salivary glands, remaining separated. 

 2 Vesicular receptacula seminis. 



6. Proparamenia bivalens nov. spec. (PI. III, figs. 83 — 100). 



Stat. 320. 6° 5' S., II4°7'E. Java-Sea. 82 M. In fine grey mud. 2 Specimens. 



Length 18 — 31 mm. Spicula more or less S-shaped. Number of gills about 20. 

 2 Specimens in the Java-sea. 



Both specimens are in a rather poor state of preservation. One of them is represented 

 in fig. 83, enlarged 4 times. The colour is brownish-yellow, here and there greyish ; the 

 anterior part is more or less reddish. The animal is somewhat shining owing to the spicula: 

 the latter are thin needies interlacing in various directions, amongst vvhich the papillae show 

 through as dark points. The ventral groove is clistinct and along the whole of its course the 

 spicula are placed in the same direction. Cloaca-spicula are not cliscernible. 



The length of the first specimen is 31 mm., the diameter 1.5 mm. 



The length of the second specimens is 18 mm., the diameter 1.5 mm. The length-index 

 varies therefore from 12 — 20. As neither of the two specimens can be considered mature, the 

 normal length has probably not been reached, the length-index being thus of doubtful value. 



The cuticle is strongly cleveloped, especially at both extremities, and entirely beset with 

 spicula, in numerous layers upon each other. The spicula are easily recognisable by their S-shape 

 fig. 84 Ai; those of shape />' are found along the ventral groove. The papillae are numerous 

 and large; thev are multi-nucleated and placed upon thick pedicles. 



