or^ans. In fio-. 109 a reconstruction of the anterior part is given. The cirrhi and „Mundleisten" 

 are entirely filled with green granules, also met with in Proneomenia Weberi. The pharynx is 

 lono- and narrow, with folded wall and built up of slender glandular cells. A circular muscular 

 layer surrounds the pharynx; besides it is encircled by numerous accumulations of pear-shaped 

 glandular cells (cf. Rhopalomenia aglaopheniae Thiele 8, pag. 268, fig. 117). The pharynx 

 opens into the spacious intestine, which is provided with a large proximal coecufn. It is here 

 that both salivary glands merge into the pharynx separately; they are long and composed of 

 cubical epithelial cells, surrounded by a layer of glandular cells of equal thickness (tig. 112). 



Of a radula or radula-sac no tracé can be found. 



In some specimens the pharynx has been entirely evaginated out of the mouth-slit. In 

 that case the salivary glands and sublingual ganglia are found outside the mouth situated upon 

 the evaginated pharynx. 



The intestine with its regular coeca, between which dorso-ventral muscular bundies take 

 their course, and the rectum opening out into the dorsal part of the cloaca, do not present 

 any peculiarities. 



The structure of the cloaca-ducts presents the principal points of similarity with Dinomenia 

 verrucosa. Fio-. 10=; oives a reconstruction of this end. It is obvious that there is much resem- 

 blance with fig. 78. In this full-grown specimen the receptacula seminis are very large and 

 entirely filled with spermatozoa. The reconstruction of the receptacula seminis is taken from 

 nature in order to show the shape of the pouches and their situation. Their number varies 

 considerably according to the more or less advanced stage of development of the animals ; in 

 fig. 105 it is about 13, a number which may still increase. 



Copulation-spicula are absent. 



The cloaca is a tolerably small cavity with irregularly folded strongly ciliated wall ; 

 gills are entirely absent. 



After what has been stated for Proneomenia Weberi the heart does not furnish anything 

 worthy of note. 



What has been noted for Dinomenia verrucosa regarding the nervous system holds good 

 here: the commissure between both lateral sterns (ganglion posterius superius) is wanting. 



This form undoubtedly strongly resembles Proneomenia Weberi. But it should remain 

 distinctly separated from it for the absence of a radula; therefore it has also to be kept distinct 

 from Proneomenia thulensis (Thiele ii) and australis (Thiele 9), which have similarly formeel 

 cloaca-ducts. 



We must arrange this form uncler the genus Rhopalomenia, allied to Proneomenia but 

 distinguished from it by the absence of a radula. From Rhopalomenia aglaopheniae Kow. & 

 Mar. it differs in the structure of the salivary glands and the cloaca-ducts. 



8. Rhopalomenia debilis nov. spec. (PI. IV, figs. 114 — 1 1 7 1. 



Stat. 204. 4°2o'S., 122 58' E. Northern entrance of Buton-strait. 75—94 M. Upon Gorgonid. 



1 Specimen. 



Length-index 8. 2 Long salivary glands, which remain separated. Rudimentary radula-sac, 



