DELTOCYATHUS AGASSIZII. 35 



might be called almost lamellar, the pillars being reduced to two or three 

 flattened ones. 



The size when full grown is about 2 cm. high, and 18 mm. in the greater 

 diameter, the smaller being 14 mm. 



Off the Abrolhos, Brazil, in 30 fathoms. 



TROCHOCYATHUS M.-Edw. & H. 



Trochocyathus Rawsonii n. sp. 



PI. VI. Jigs. 7, S, 9, 10. 



Corallum attached by a more or less expanded base, generally becoming 

 very small in old specimens, short-conical, or cupshaped ; without epitheca. 

 Costaj well marked, granulated. Calicle circular. Fossa moderately deep. 

 Septa thin, slightly exsert, rounded, with small sharp granules. Four cycles 

 and sometimes a few septa of the fifth. Pali slender, sometimes lobed in 

 front of the septa of the three first cycles, distant from the centre in propor- 

 tion to the age of the cycle. Columella small, composed of five or six slender 

 points loosely connected with one another. 



Height 8-10 mm., diameter 10 - 17 mm. Dredged in 100 fathoms off Bar- 

 bados, and also by Dr. Stirapson in the same depth on the west coast of Flori- 

 da. The Florida specimens are generally more cupshajjed and have a much 

 smaller base of attachment than those from Barbados. They are also of a 

 somewhat larger size at an average. 



DELTOCYATHUS M.-Edw. & H. 



Deltocyathus Agassizii Pourt. 



Var. calcar. PL VI. fig. ii. 



A considerable number of fine specimens, living and dead, were obtained 

 off Barbados in 100 fathoms. All but one specimen belong to the well- 

 marked variety with spines on the primary costse, which I should not hesitate 

 to consider as specifically distinct but for a few specimens which show inter- 

 mediate characters. All the Barbados specimens have the spines remarkably 

 developed, an abnormal one having as many as three on each primary costa. 

 Fresh specimens are prettily colored of a jiurplish Ijrown, darkest on the 

 secondary septa and next on the tertiary ones. The primary ones with the 



