2 
ON A NEW SPECIES OF ENTEROPNEUSTA, 
recorded from Australia, I propose for it the specific name 
australiensis. 
The publication 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 sexually 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 of Occurrence and External Characters. 
Like the other species of the genus Ptychodera, Ft. 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 occupying 
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. Monographie : Enterop- 
neusten, von Dr. J. W. Spengel. 
