40 



and this, it will be observed, would be easily derived from the 

 type " 6," and is practically realised in some of the young examples 

 of P. ovalis (Fig. 3). 



Phoronis architecta, Andrews,* was found at Beaufort, North 

 Carolina. It has a lophophore of the type " 4 " (Fig. 3) and thus 

 approaches closely to the Mediterranean and eastern North 

 Atlantic types referred to belovv^. The animal lives in muddy 

 sand, and the tubes are encrusted with sand grains. The 

 longitudinal muscles number about 43, and are especially strongly 

 developed m the upper part of the metasome. The tentacles 

 are about 60 in number. The young Phoronis obtained by Willey f 

 from the metamorphosis of an Actinotrocha captured in St. 

 Andrews Bay, New Brunswick, and the young Phoronis obtained 

 in the same way by Wilson { from Chesapeake Bay may belong 

 to this species. 



Phoronis sahatieri, Roule (40 to 50 tentacles, 25 to 30 longi- 

 tudinal muscles, Mediterranean). 



P. psam^nophila, Cori (tentacles 60 to 106, 32 to 39 longi- 

 tudinal muscles, Mediterranean). 



These have been united by de Selys Longchamps, and so far 

 as the shape of the lophophore is concerned they agree also with 

 P. kowalevskyi, Benham (tentacles 60 to 126), and P. hij^pocrepia, 

 Wright (tentacles 16 to 130, longitudinal muscles 30 to 40). 



P. sahatieri is evidently usually fixed to shells by its tube, 

 P. psammopliila is found in sand, P. kowalevskyi occurs in colonies 

 adhering to piles. P. hippocrepia has been obtained from burrows 

 in stones, and since its discovery on the shores of the Bristol 

 Channel has been captured at several places in the Enghsh Channel 

 and is recorded from the Clyde. 



Phoronis ijimai, Oka, Japan, according to Ikeda is indistin- 

 guishable from P. hippocrejna. It forms encrusting colonies hke 

 P. kowalevskyi. The tentacles number 150 to 210, and the length 

 of the animal is 40 to 100 mm. 



P. pacifica, Torrey, California, is evidently closely related to 

 P. ijimai. 



Phoronis huskii, Mcintosh, Phihppines, lophophore still further 

 enrolled leading to the condition of P. australis, Haswell. P. 



* 1890. Ann. and Mag. Nat. Hist., v. 5, 6th ser., p. 445. 

 1 1915. Contributions to Canadian Biol., No. 396, p. 6. 

 t 1881, Quart. Jour, Micros. Sc, v. 21, p, 202. 



