A ON A NEW SPECIES OF ENTEROPNEUSTA, 



recorded from Australia, I jiropose for it the specific name 

 anstraliensis. 



The pubKcation of Spengel's beautiful Monograph on the 

 Enteropneusta"^ has rendered it unnecessary for me to enter into 

 details of histology and the like, and also I do not propose, in 

 this paper, to enter into the much discussed question of the 

 affinities of the group. In the description, then, only points of 

 specific difference are insisted on. I have adopted, generally, the 

 terms proposed by Spengel, and my indebtedness to his mono- 

 graph will be readily apparent from the sequel. 



The species occurs in considerable abundance in a rocky corner 

 of the ocean beach nearly opposite Creel Bay and a little to the 

 south of the well known Hole in the Wall. Since the discovery 

 of the species there in August of last year I have made two 

 subsequent expeditions to the locality for further supplies of 

 material, once in January and again in May of this year, and 

 only on my last visit did I succeed in finding sexualty mature 

 individuals, so that the breeding season may, approximately, be 

 given as the end of autumn. 



During my visit to the locality I was very kindly accommodated 

 by Mr. Chas. Hastie, of Creel Bay, and I must here take the 

 opportunity of expressing my thanks to him for this kindness, 

 and also to his family for much help in collecting specimens. 

 Further, I must again acknowledge my indebtedness to Herr W. 

 Musmann for much assistance with the literature. 



Mode op Occurrence and External Characters. 



Like the other species of the genus Ptychodera, Pt. australiensis 

 is littoral and confined to very shallow water. It is found, at low 

 water, most abundantly in the loose gravelly sand at the bottom 

 of the shallow pools, and especially in such sheltered situations as 

 the gravelly sand under and around the large stones occup3dng 

 the area included between high tide and half tide marks, very 

 few specimens (if any) being found close to the low water mark. 



* Fauna und Flora des Golfes von Neapel. xvii. Monographic : Enterop- 

 neusten, von Dr. J. W. Spengel. 



