200 BUIXETIN Ot THE 



Deltocyathus Agassizii Pourt. 



About 375 specimens were obtained, ranging in deptb from 84 to 888 

 fathoms. They can be classed into two varieties, cquicostatus and calcar, pas8- 

 ing into each other through an intermediate one having the thicker primary 

 costae of calcar, but no projecting spurs. Some of these appear to have had the 

 spurs at one period of their growth, but not to have kept them Avhen full grown. 

 One specimen has the earlier stage decidedly of the calcar variety, and then 

 suddenly has become equicostate for the rest of its growth. There is no de- 

 cided preponderance of one variety over the other due to dejjth, but sometimes 

 a cast of the dredge brings only one variety, sometimes both in about equal 

 numbers. Of the many hundred West-Indian specimens 1 have examined, none 

 have shown any trace of adherence, even when so yoimg as to have a diameter 

 of but one or two millimeters. I regret that want of room prevents me from 

 giving figures of a selection from numerous mutilated and mended specimens, 

 showing that the genera Ecmcsiis Philippi, Hemicyathus Seguenza, and the 

 Genus incertw sedis of Professor Duncan are nothing but similar individuals 

 of Deltoajathus and sometimes of Diaseris. 



Station No. 36. Lat. 23° 13' N., Long. 89° 10' W. 84 fma. 



" " 32. Lat. 23° 52' N., Long. 88° 5' W. 95 fms. 

 (Sigsbee.) Off Havana. 100 fms. 



" Off Sand Ke)^ Fla. Ill fms. 



" Lat. 26° 31' N., Long. 85° 3' W. 119 fms. 



" Off Havana. 158 fms. 



" Off Havana. 175 fms. 



" Lat. 22° 9' N., Long. 82° 21' W. 177 fms. 



Station No. 20. Lat. 23° 25' N., Long. 83° 11' W. 220 fma. 



" " 3. Off Havana. 243 fms. 



(Sigsbee.) Off Havana. 458 fms. 



Station No. 21. Lat. 23° 2' N., Long. 83° 11' W. 287 fms. 

 « " 19. Lat. 23° 3' N., Long. 83° 10' W. 310 fms. 



" " 2. Off Havana. 805 fms. 

 « " 46. Lat. 25° 43' N., Long. 84° 47' W. 888 fms. 



Paracyathus De Filippii D & M. 



Telegraph cable, off Sand Key, Fla. 45 fms. 



Off Havana. 80 fins. 



Station No. 32. Lat. 28° 52' N., Long. 88° 5' W. 95 fms. 



" " 22. Lat. 23° 1' N., Long. 83° 14' W. 100 fms. 



" « 45. Lat. 25° 33' N., Long. 84° 21' W. 101 fms. 



(Sigsbee.) Lat. 26° 31' N., Long. 85° 3' W. 119 fms. 

 Station No. 23. Lat. 23° 1' N., Long. 83° 14' W. 190 fms. 



" " 2. Oflf Havana. 805 fm.s. 



