162 PROCEEDINGS OF THE ISTATIONAL MUSEUM vol.72 



America is very important. As it has not yet been discovered 

 among the fossils, we must conclude that it arrived here only in the 

 recent epoch. However, the genus Diplosolen is know since the 

 Jacksonian. 



Occurrence. — Albatross Station D. 2319, north of Cuba; 23° 10' 

 37" N.; 82° 20' 06" W.; 143 fms.; gray coral. 

 Albatross Station D. 2321, north of Cuba; 23° 10' 

 54" N.; 82° 18' 00" W.; 230 fms.; fine gray sand. 



Geologic distribution. — Helvetian of Touraine, France (Canu collec- 

 tion) Tortonian of Hungary (U. S. National Museum) ; Sicilian of 

 Italy (Neviani). Pleistocene of Italy (Neviani, Sequenza). 



Geographic distribution. — Northern Hemisphere, where it inhabits 

 the principal seas; Spitzberg, Sea of Kara, Nova Zembla, Greenland, 

 Jean Mayen (Gulf of St. Lawrence) Scandinavian, Danish and Brit- 

 ish coasts and English Channel, Gulf of Gascony, Grand Banks of 

 Newfoundland. 



Plesiotypes. —C&t. Nos. 7489, 7490, U.S.N.M. 



Genus CRISULIPORA Robertson, 1910 



CRISULIPORA ORIENTALIS, new species 



Plate 29, Figures 3-8 



Description. — The zoarium is attached to floating bodies; it is artic- 

 ulated and formed of claviform bi to tri furcate segments in which 

 the noncellular face is plain or concave. The tubes are distinct, 

 separated by a furrow, finely striated transversely by lines of punc- 

 tations, terminated by a long, free, arched and erect peristome. 

 The peristome is thin and orbicular. 



Measurements. — Diameter of peristome, 0.14 mm. 



Maximum length of peristome, 0.56 mm. 

 Distance of peristomes, 0.80 mm. 

 Separation of peristomes, 0.72 mm. 

 Maximum length of segments, 7.00 mm. 

 Maximum width of segments, 3.00 mm. 

 Affinities. — Like the other species of this genus, this species is 

 ■attached to floating algae; the colonies are not bushy. They creep in 

 the manner of Proboscina but remain free. The rounded substratum 

 is the cause of the dorsal concavity of the segments. The species 

 differs from Crisulipora occidentalis Robertson, 1910, in the concave 

 form of the dorsal of the segments, in the flabellated segments, and 

 in the smaller micrometric dimensions. It differs from Crisulipora 

 fiabeUata Canu and Bassler, 1920, in its much larger and broader 

 segments and in the greater length of the free peristomes. 



The genus begins in the Vicksburgian of Alabama and we have 

 described four species. The simultaneous presence on the western 

 and eastern shores of the United States is proof of the ancient com- 



