CHAP. 11.] MADEIRA TO THE COAST OF BRAZIL. 113 



Among tlie actinozoa, this haul yielded a very beautiful new 

 coral (Fig. 30), which has been described by Mr. Moseley under 

 the name of Cemtotrochus dtadema. 



The corallum is white, shallow, and saucer - shaped, with a 

 short rudimentary pedicle and a small scar of adherence. The 

 ])rin]ary and secondary costse are prominent and serrate ; there 

 are six systems of septa and five cj'cles ; the whole of the septa 

 are exsert, the primary and secondary extremely so, projecting 

 10 mm. above the margin of the calicle. The quinary septa 

 unite with the quaternary, the quaternary with the tertiary, the 

 tertiary with the secondary. The primary septa remain free 

 throughout their whole course to the columella ; the columella 

 is large and oval, and composed of contorted fascicular matter. 

 The extreme diameter of the corallum between the tips of the 

 exsert septa is 5*75 centims., the extreme height 2'15 centims. 



A young living specimen of this coral had been previously 

 dredged at Station LXXYIII. between the islands of San Mi- 

 guel and Santa Maria, at a depth of 1000 fathoms ; and the 

 single adult specimen now procured was without its soft parts, 

 but perfectly fresh, and apparently only recently dead. 



On the following day, keeping nearly the same course, we 

 trawled three times at a depth of about 400 fathoms, and got a 

 large number of very interesting forms, the assemblage, on the 

 whole, reminding us very much of the fauna at about the same 

 depth off the coast of Portugal. Among the special j)rizes were 

 two specimens of the rare little crinoid Rhizocrinus lofoteiuis^ 

 each infested by several individuals of a species of Stylifer; 

 and a single example of a fine undescribed species of the genus 

 Pentac7'mus, of which I shall now give a preliminary notice, 

 proposing for it the name Pentacrinus Maclearaniis^ (Fig. 31). 



The length of the entire specimen is about 13 centims. ; and 



* I dedicate this species to Captain Maclear, R. N., whose friendly co-operation in 

 his important executive capacity of commander of the Challenger was of the great- 

 est importance to us. 



