22 



rationa! to separate Proparamenia and Paramenia, even though there is some affinity both on 

 account of the structure of the salivary glands and the gills. The name Proparamenia has been 

 chosen in order to indicate in some measure the doublé relation. 



Rhopalomenia. 



-. Rhopalomenia indica nov. spec. (PI. III, figs. 101 — 112). 



Stat. 5. j° 4.6' S., 114° 30'. 5 E. N. E. coast of Java. 330 M. In mud. 4 Specimens. 



Stat. 47. Bay of Bima (Sumbawa). 55 M. Upon Gorgonid. 1 Specimen. 



Stat. 162. Betweel] Loslos and Broken-islands. W. coast of Salawatti. (W. coast of N. Guinea). 



18 M. 1 Specimen. 

 Stat. 253. 5°48'.2S., I32°i3' E. To the West of the Kei-Islands. 304 M. Upon Gorgonids. 



8 Specimens. 

 Stat. 262. S°53'.8S., I32°48'.8L. To the West of the Kei-Islands. 560 M. Upon Gorgonids. 



6 Specimens. 

 Stat. 289. 9 o'-3 S., I26°24'.5E. S. E. coast of Timor. 112 M. In mud. 6 Specimens. 

 Stat. 305. Between Flores and Lomblen. 113 M. Upon Gorgonids. 2 Specimens. 



Length-index 9 — 26. 2 Long salivary glands, which remain separated. A great number 

 of receptacula seminis. Cloaca in a superficial groove. 

 East-Indian Archipelago. 



This animal is of frequent occurrence and of very variable dimensions. The length varies 

 from 11 — 39 mm., the diameter from 1 — 2.5 mm., the length-index from 9 — 26. This great 

 dirïerence in size must probably be attributed to the animal being either mature or not. The 

 external appearance is the same : terminating rather pointedly. The colour is brown, but sometimes 

 more yellowish or darker (figs. 101 — 103). The ventral groove is distinct. The integument 

 is glittering owing to the interlacing spicula. In some of the specimens the pharynx has been 

 evaginated out ot the mouth-slit. 



The spicula are of the ordinary Proneomenia-shape : they are straight or curved and 

 hollow (fig. 104 A). Around the cloaca-opening spicula of shape C are found, and along the 

 ventral groove those of shape B '. The structure of the integument too points directly to the 

 relation with Proneomenia or Dinomenia : the cuticle is thick, with many layers of spicula. Each 

 spiculum is formed by 1 cel!, fitting round the base of the young spiculum. The numerous 

 papillae are multicellular. 



The dorsal sense-organ is distinct and may be compared with that of Proneomenia 

 Sluiteri (Hubrecht i, fig. 11); the nerve, from which it is innervated, is also visible. 



The ventral groove runs as far as the cloaca and contains 1 large median fold and 

 2 smaller lateral ones. The "vordere Bauchdrüse" is strongly developed ; its clear finely fibrillar 

 cells are met with everywhere in the anterior body-region around the pharynx. 



The cloaca-opening is found in a kind of furrow ; this furrow, either deep or shallow, 

 is lined with a cuticle, in which numerous flat spicula are implanted; these are placed parallel 

 ti' each other and are slightly bent (fig. 104 C); in this part papillae are absent (fig. 108 c. g.). 



The specimens differ chiefiy from the preceding species in the structure of the digestive 



