REPORT ON THE GEPHYREA. 23 



C. Appendix. 



Among the worms entrusted to me for investigation there was a Chcetoderma from 

 the Malayan Archipelago. In spite of the investigations of Lov^n, Keferstein, Mol)ius, 

 Graff, and Arnauer Hansen, the systematic position of this animal remains a very debate- 

 able question. Nor am I able to contribute anything to the elucidation of the problem, 

 for the single specimen at my disposal was too soft and too easily broken to admit of the 

 investigation of its internal structure. Nor did the examination of a series of cross- 

 sections yield me the desired information. This only I am able to affirm, that the 

 specimen of the Challenger Expedition does not structurally difi'er in any essential point 

 from the Clioetoderma nitidiihon, Loven, from the North Sea. . There were, however, 

 noticeable differences in the form of the calcareous spicules, and on these I have been 

 compelled to base the diagnosis of the species. 



Genus 11. Chcetoderma, Loven. 



Worm-like hermaphrodite animals without segmentation. A cerebral ganglion and 

 paired lateral nerve-cords. The mouth bears teeth, and the whole body is studded with 

 calcareous spicules. 



24. ChcBtoderma militare, n. sp. (PL IV. figs. 28-32). 



The calcareous spicules of the proboscis are in the neighliourhood of the mouth flat 

 and elliptical, further back they ar'e larger and have the form of shovel-like or tongue- 

 like plates, and finally, they gradually become smaller again and take the form of keeled 

 spear-like points. The body proper bears only a very few thinly scattered rounded 

 calcareous plates, but at the posterior end there are again large plates, which towards the 

 anus become long stout prickles with a cross-section between circular and elliptical. 

 Round about the anus are numerous small prickle-like or awl-shaped calcareous 

 needles. 



Hahitat.—^t'Aiion 210, January 25, 1875; lat. 9° 26' N., long. 123" 45' E. ; depth, 

 375 fathoms ; bottom temperature 54°'l, surface temperature 80°"2 ; blue mud. 



I regret that it is impossible for me to give a more accurate diagnosis of this 

 species. The only species of Chcetoderma as yet known, namt'ly the Chcetoderma 

 nitidulum, Loven, was found in the North Sea, and it would have been desirable to 

 submit to a close comparison forms found in such difl'erent localities. 



But since the nature of the calcareous spicules affords a ready distinctive character, 

 I do not hesitate to establish the single example of the Challenger Expedition as a new 



