ENTEKOPNEUSTA FEOM THE ABKOLHOS ISLANDS. 87 



Ptychoderajlava, 



var. from Funafuti. Habitat : Funafuti. Pacific Ocean, 



Pt.Jiava, 1 



var. parva. 



var. laccadivensis. 



var. maldivensis. 



var. saxicola. 



var. gracilis. 



var. muscula. 



var. cooperi. 



PL peharti Habitat : Abrolhos Islands. Southern Indian 



Ocean. 



Habitat: Laccadive and Maldive Isles. Indian 



Ocean. 



J 



To complete the list, the remaining species o£ the genus Ptychodera., as now 

 limited, may be added : — 



Ptychodera erythrcea Habitat: Red Sea. 



Ptychodera bahamensii . . . . Habitat: Bahamas. 



Ptychodera viriclis / tti-j.^. urii- r ^ ^ 



^ . \ Habitat: Maldive Islands. 



Ptychodera asymmetnca . \ 



Ptychodera pelsakti. 

 Colour, Measurements, and External Form. 



Like most species o£ the Ptychoderidje, Pt. pelsarti (PI. 10. fig. 1) is 

 littoral and occurs in very shallov^ water. Its habitat, like that of Bala- 

 noglossus australiensis, is loose, gravell}^ sand, under and around stones in 

 sheltered pools between tide-limits. 



The colour is a nearly uniform pale yellow, the hepatic cseca not being 

 too decidedly marked by colour, but only a little darker (brownish), and this 

 only anteriorly. The body of the animal, particularly the posterior region, 

 is translucent, hence the contents of the alimentary canal — shell and gravel 

 — can be quite easily seen in the living animal. The animals are somewhat 

 delicate, and care must be taken to keep them complete while removing them 

 from the sand. 



Size. 



No accurate measurements were made of the animals when alive. This 

 is much to be regretted, because the amount of contraction taking place 

 after fixation and preservation is extremely great. The average size of the 

 animals captured was about 10 cm. 



The size of the 10 cm. specimen after fixation is approximately 50-60 mm. 



Proboscis. 

 The proboscis is short, and, in preserved specimens, is only equal to the 

 width of the collar. In life the proboscis is constantly being extended, so 

 that its length is greater than its width. The extended length, however, 



7* 



