200 CEYLON PEARL OYSTER REPORT. 



pedicels. They appear, in many cases, to have small rudimentary terminal discs, so 

 that it is difficult to distinguish them from true pedicels. Both pedicels and papillae 

 are of the same colour as the general integument, so that they are not very 

 conspicuous. 



The specimen has a typical Aspidochirote calcareous ring. 



There is one large Polian vesicle, 30 millims. long, and there are about eight stone 

 canals attached to the dorsal mesentery. 



The right respiratory tree is much larger than the left. This form also possesses 

 Cuvierian organs. 



The general body wall is very thick, about 5 millims. This is probably, to a certain 

 extent, due to contraction. 



Deposits : Not very thickly scattered. They consist typically of a short straight 

 rod with dichotomising ends (figs. 36-38). Sometimes the spicules are dumb- 

 bell shaped or bone-shaped (figs. 39-41). The pedicels have no supporting rods, nor 

 spicules of any kind, except a terminal plate. The character from which I have taken 

 the specific name, viz., the serration of the anal teeth, is a very distinct one, and 

 would serve alone to distinguish the species. 



Holothuria kurti, Ludwig. Plate III ' figs. 4245. 



&- 



H. lamperti, Sluiter, 1889 (10), (15). 



One specimen from Pearl Banks, Gulf of Manaar (Stn. LXVi.) ; three specimens 

 from south of Adam's Bridge (Stn LTV.), 4 to 40 fathoms. 



The lengths of the specimens vary from 25 millims. to 40 millims. The specimens 

 agree with Sluiter's description. 



Deposits : The spicules agree in the main with Slujter's description There are 

 two kinds of table round tables and cross-shaped tables, each kind being surmounted 

 by a comparatively tall tower ending in numerous teeth. The size of the tables 

 varies very much. In the papillae there are also knobbed " buttons," having six or 

 seven pairs of holes as figured by Sluiter. In some of the specimens there are also 

 some smooth buttons scattered about in the skin, having six or seven pairs of holes. 



So far as I can determine, the cross-shaped tables are derived from the round tables 

 by pieces having become broken or dissolved away ; so that there is really only 

 originally the one kind of table, the cross-shaped form being only a stage in the 

 dissolution of the round form. I found all stages between the two extremes (see 

 tigs. 42-45). Consequently, in a young specimen, we should expect the round form 

 to predominate, and as the animal grows bigger, the cross-shaped form of table would 

 increase in number. 



This species is now recorded from Ceylon lor the first time. 



Distribution : Java, Ceylon. 



