114 BULLETIN OF THE 



■with spinv or smooth granules ; tbc six primary costs in one specimen 

 much broader than the others and forming a star. Septa in six complete 

 systems, with four cycles ; covered with small spinous tubercles. Pali of the 

 first, second, and third cycles projecting generally higher than the septa, to 

 which they are soldered at the base. The pali of the fust cycle short, 

 those of the third joined to those of the second, as in the ibssil species, but 

 the point of junction not being exsert the V or delta is not as apparent. 

 Columella papillose and small, rising from the primary and secondary 

 pali which meet in the centre. 



Dredged from 270 fathoms off Havana, in numerous specimens of all 

 ages, but none apparently alive. 



Platytrochus coronatus Pourt. 



This species, not belonging properly to the region under discussion, is 

 based on a specimen brought up by the sounding lead from a depth of 460 

 fathoms in lat. 30° 41' N., and long. 77° 3' W., by one of the hydrograph- 

 ical parties of the Coast Survey. It is in a bad state of preservation, the 

 outer wall and base being so corroded as to make the characters drawn 

 from the epitheca and costae very doubtful ; the septa and columella are 

 also rather imperfect. 



Corallum free, base horizontal, with a tubercle in the centre. The costae 

 of the primary and secondary order alone distinct, forming a crown of 

 twelve large tubercles around the base, but vanishing towards the edge of 

 the calicle. Wall vertical, almost at a right angle with the base and the 

 circular calicle. Six complete systems of septa, in four cycles. Septa 

 meeting in the centre Those of the tertiary cycle frequently but not reg- 

 ularly coalescing with the primary or secondary ones. Columella proba- 

 bly papillose (nearly destroyed). Diameter -{' 5 of an inch, height (without 

 the central tubercle) ^ of an inch. 



Diplohelia profunda Pourt. 



Corallum branching, cylindrical, finely granulated or striated, particu- 

 larly on younger branches and around the calicles, which are projecting, 

 very deep and pocket-shaped. Septa 21, nearly equal, not exsert, finely 

 serrated and tuberculated, nearly meeting at the bottom of the fossa. 

 Columella formed of six or seven club-shaped styles, not very distinct 

 from the septa. The specimens obtained were all in fragments 2 or 3 

 inches long. Diameter ^ inch. 



This species resembles the fossil Dipt, raristclla, but has deeper calicles 

 and somewhat rougher surface. 



Dredged from 350 fathoms off Havana; all the specimens dead; also 

 brought up by the lead in same condition in 10.30 fathoms, lat. 28° 24' N., 

 loner. 79° 13' W. 



