14 



They may be compared with the "bourrelet cilie" which Pruvot gives for Proneomenia vagans 

 (4 fig. 60). Here however nothing is perceptible of a "goiittiere" formed by this band and the 

 heart itself and serving for the passage of the spermatozoa: the "bourrelet" always remains 

 here at a certain distance from the heart, and the pericardial wall between both is by no 

 means deepened. The band proceeds towards the point, where the cloaca-ducts pass out of 

 the pericardium. 



The question now arises where to place this form. It cannot be classed in any of 

 the genera known up to now. On account of the distichous radula it departs from Proneomenia, 

 the latter having always a polystichous radula. It might be compared with Paramenia, but from 

 this genus it differs by the structure of the integument and the absence of gills. I look, upon 

 this lorm as a new genus. The structure of the integument and of the radula is of the greatest 

 significance for the Solenogastres. In these characteristics it differs from it closest relations, the 

 genera Proneomenia and Paramenia, with each of which it has one characteristic in common. 

 Therefore it is to be regarded as intermediate between both ; it is related to Proneomenia 

 because of the integument and to Paramenia on account of the distichous radula. 



5. Ditiotnenia verrucosa nov. spec. (PI. II, figs. 60 — 75, PI. Ill, figs. 76 — 82). 



Stat. 50. Badjo-Bay, W. coast of Flores. Upon Hydroid. 40 M. i Specimen. 



Stat. 164. i°42'.5 S., I30°47'.5 E. Between N. Ceram and New-Guinea. 32 M. i Specimen. 



Stat. 260. 5°36'.5S., I32°55'.2E. Near the Kei-Islands. 90 M. 2 Specimens. 



Stat. 289. 9° o'.3 S., 126° 24'. 5 E. S. E. coast of Timor. 112 M. In mud. 6 Specimens. 



Stat. 310. 8° 30' S., 119° 7'-5 E. To the N. of Sumbawa. Upon Hydroid. 73 M. i Specimen. 



The dimensions vary considerably: full grown specimens may obtain the length of 98 mm. 

 The integument is provided with many prominences. The cirrhi in the mouth-cavity are united 

 into bundles. Radula with many rows of teeth. The salivary glands spring from two ventral 

 pouches of the pharynx. A great number of stalked receptacula seminis (or vesiculae seminales). 

 No copulation-spicula. 



East-Indian Archipelago. 1 1 Specimens. 



One of the specimens has been represented in fig. 60, drawn from life, in natural size. 

 The length is 98 mm.; average diameter 6.25 mm.; the length-index being therefore 16. 

 Proximally the animal is broad and rather bluntly truncated ; more distally it becomes thinner 

 and terminates rather pointedly. The mouth-slit is slanting. The ventral groove is distinct but 

 narrow. Colour : orange-red with bright violet prominences, irregularly dispersed all over the 

 body, only absent on the ventral side. This specimen is full-grown. 



Another young specimen is represented in fig. 61 enlarged four times. The length-index 

 of the other specimens varies from 9 to 20, a considerable difference 1 But the length-index 

 may be said to be 16—20, the one specimen of the length-index 9 showing some deviations, 

 probably not being quite normally developed. Outwardly the different specimens also differ 

 considerably. The animals are either light or dark brown, sometimes with reddish end, sometimes 

 with lighter prominences. Only the largest specimen (fig. 60) is of the above-mentioned two 

 colours, and has to be regarded as the most fully developed ; the other specimens, though 



