AGASSIZIA. 163 



the Swedish South Polar Expedition secured a specimen of the same species 

 and a series of specimens of a second closely allied form. Finally the Expedition 

 Charcot in 1909 secured a single specimen of what seems to be a third species. 



Key to the Species of Amphipneustes. 



Periproct on oral surface; test high, v. d. exceeds .60 length. 



Petals nearly or quite flush with the test lorioli. 



Proximal portion of paired petals deeply sunken mortenseni. 



Periproct on posterior vertical end of test, not visible from below koehleri. 



Amphipneustes lorioli. 



Koehler, 1900. Bull. Acad. Belgique, (3), 38, p. 817. 



This is the Belgica's species, taken far down in the Antarctic Ocean below 

 South America, at a depth of 334 fms. The specimen taken by the Swedish 

 Expedition was collected off Graham's Land (directly south of Tierra del Fuego) 

 in 223 fms. 



Amphipneustes mortenseni. 



Koehler, 1912. Zool. Anz., 39, p. 162. 



The only known specimen of this species was taken near Alexander the 

 First Land (just west of Graham's Land) in 165 fms. by the Expedition Charcot. 



Amphipneustes koehleri. 



Mortensen, 1905. Vid. Med. f. 1905, p. 243. 



A good series of this species was taken by the Swedish South Polar Expedi- 

 tion in the vicinity of South Georgia and near Shag Rock Bank, at a depth of 

 only 42-90 fms. 



Agassizia. 1 



Valenciennes, 1846. Voy. Venus. Plates, Zoophytes, 1, figs. 2-2/. 

 Type, Agassizia scrobiculata Valenciennes, 1846. hoc. cit. 



This is a very well-marked genus, the affinities of which are doubtful. 

 The fascioles have an unusual arrangement which is very characteristic. Pedi- 

 cellariae seem to be very rare and are not at all distinctive. 



1 Originally spelled Agassisia. 



