114 DR W. A. HERDMAN ON 



Postscript. 



Since the above was written, I have received from Mr Murray another 

 "Triton" specimen. This necessitates the following addition to my report 

 which should be inserted between " Ascidiacea" and " Family Cynthiidse," near 

 the top of page 95 : — 



Family Molgulid^e. 



Eugyra glutinans, Moller. 



A single specimen of this widely distributed species was obtained in the 

 second haul of the trawl on the 22nd August 1882, at Station 8 (in the " cold 

 area," near the S.E. end of the " Wyville-Thomson " ridge), from a depth of 640 

 fathoms. This is a greater depth than any from which Molgulidae were 

 obtained during the " Challenger " Expedition. 



The incrusting sand is very fine, and the bare area around the apertures is 

 conspicuous. In the branchial sac there are usually about eight coils in the 

 spiral forming each infundibulum. The specimen measures 9 mm. in breadth 

 by 6 "5 mm. in length. 



EXPLANATION OF THE PLATES. 



The objectives employed while drawing the figures were as follows : — 

 Swift, 1 inch — magnifies about 45 diameters. 



» i » 



» 



225 



» 6 » 



)9 



300 



Hartnach, No. 4 



9> 



50 



5 



» 



180 



7 



)) 



330 



Zeiss j 1 ^ oil immersion 



» 



950 



The following system of lettering has been adhered to in all the figures 

 at, atrial aperture. 

 br, branchial aperture. 

 br.f, fold in branchial sac. 



c, enlarged end of tubule of intestinal gland. 



d, duct of intestinal gland 

 cU, dorsal lamina. 



d.t, dorsal tubercle. 



en, endostyle. 



g, genital mass. 



gl, gland at pylorus of stomach. 



g.c, nerve cells in outer part of ganglion. 



h, heart. 



