CORONATVE PERIPHYLLA, PERIPHYLLOPSIS. 



547 



records a specimen fully as high as wide. According to him, the pedalia are rectangular and 

 longer than wide, but according to Maas, 1897, they are nearly circular in outline. The 

 tentacles are said to be short and thick, and the stomach very large and wide, but these points 

 as well as the proportions of the bell, are probably affected largely by growth and contraction. 



Found on the bottom of the Pacific and Atlantic from the Antarctic regions to the tropics. 



It is the largest form of Pcriphylla and may become 200 mm. wide. 



Genus PERIPHYLLOPSIS Vanhoffen, 1900. 



Ptriphyllofisii, VANHOFFEN, 1900, Zool. Anzciger, Bd. 23, p. 278; 1902, Wissen. Ergeb. dcutsch. Tiefsee Esped., 1'alJivla, Bd. 3, 

 Lfg. I, p. 27. -MA*S, 1907, Ergcb. und Fortschrittc der Zool., Bd. i, p. 195. BIGELOW, H. B., 1909, Mem. Mus. Comp. 

 Zoo], at Harvard College, vol. 37, p. 27. 



The type species is Ptriphyllopsis braueri Vanhoffen, of the Indian Ocean; from a 

 depth of 1,200 fathoms. 



GENERIC CHARACTERS. 



4 interradial rhopalia, 4X5 (20) tentacles, 4X6 (24) lappets. 



Periphyllopsis braueri Vanhbffen. 



Peri fliyllaf sis braueri, VANHOFFEN, 1902, Wissen. Ergeb. deutsch. Tiefsee Expedition, Dampfer Faldivia, Bd. 3, Lfg. i, p. 27, 

 taf. 2, fig. 7. BIGELOW, H. B., 1909, Mem. Mus. Comp. Zool. at Harvard College, vol. 37, p. 28, plates 9 and 12. 



Vanhoffen's single specimen was so imperfect that he could not venture to present a 

 detailed description of it. Recently, however, Bigelow describes a more nearly perfect specimen 



345- 



Periphyllopsis braueri. 



FIG. 345. After Vanhoffen, in I'alJivia Expedition. Aboral view of hell. 

 FIG. 346. With the walls of the stomach torn away leaving only its base with the gastric cirri. 

 After H. B. Bigelow, in Mem. Museum Comp. Zool. at Harvard College, 1909. 



from the collections of the Albatross, and the account here given is mainly derived from his 

 description. 



Bell flattened, 60 mm. wide and 25 mm. high, resembling an Atolla in shape. Central 

 disk about 50 mm. wide; ring-furrow deep. 4 interradial rhopalia, 24 (4x6) ovate marginal 

 lappets, and 20 (4x5) tapering tentacles, about as long as the bell-diameter. Thus the radial 

 arrangement of the various organs is the same as is seen in Periphylla, only the numbers of 

 lappets and tentacles being greater. The ring-muscle of the subumbrella is very weak as in 



