• ECHINODERMATA— CLARK. 551^ 



One of these specimens is of particular interest because it 

 aftords a remarkable illustration of the resorption of an animal's 

 tissue by another animal. A barnacle (acorn shell) attached to 

 the upper side of the test has resorbed an area 16 mm. across, and 

 practically through the test, so that the base of the barnacle is 

 completely sunken below the surrounding surface. There is 

 every indication that both the Echinanthus and the barnacle 

 were living when dredged. 



LAGANUM PERONII. 



Laganum Peronii, Agassiz, Men. Scut., 1841, p. 123. 



1 specimen from Station 44. Off Coogee, 49-50 fathoms ; fine 

 sand. 



1 specimen from Station (?) A dead and bare test. 

 These specimens are about 20 mm. long. They show no 

 peculiar features. 



BREYNIA AUSTRALASIA. 



Spatangus australasice, Leach, Zool. Misc., ii., 1815, p. 68, 

 Breynia, australasice, Gray, Ann. Mag. Nat. Hist., (2), vii , 1851,. 

 p. 131. 



One specimen from Lord Howe Island, where it is said to 

 occur " in great abundance in the sandy bottom of the lagoon." 



HOLOTHURIOIDEA. 



The collection of Holothurians is so small and the specimens 

 are as a rule in such poor condition that it is of far less interest 

 than any one of the other classes. The only notable fact is the 

 occurrence of two species of Molpadia at the same station, three 

 specimens of each, and both new to science. In view of my 

 recent critical revision of the genus, ^^ in which 1 have refused 

 to recognize as valid a considerable number of species described 

 by other workers, I feel that I lay myself open to criticism in so 

 quickly describing two new species. I can only plead inability 

 to find any known species to which they could possibly be referred; 

 each appears to be remarkably well-characterised. 



HOLOTHURIA DIFFICILIS. 



Holothuria difficilis, Semper, Holothurien, iii,, 1868, p.92. 



Two specimens from Lord Howe Island. 



The larger of the two specimens has only eighteen tentacles, 

 while the condition of the smaller prevented its number from 



39Clark— Apodons Holothurians, 1908, pp. 156-172. 



