8 ART. 7. — K. KIXOSIIITA : ON SOME MUEICEID CORALS 



a slender spicule resembling- the Hoating rib of mammals (PL II., 

 fig. 12, c). 



The cœnenchyma is formed of two kinds of spindle-shaped 

 spicules. The one kind is very large, lies exposed on the surface 

 andean be easily seen with the naked e}e. It presents the form 

 of a spindle or rhombus, sometimes with bifid end. They are 

 closely set, so as to make a continuous pavement. They are 

 especially large and conspicuous on the posterior surface of the 

 colony, reaching 4 mm. in length by a breadth of less than 0.5 

 mm. When well developed, they are arranged longitudinally. 

 The outer surface shows the same sculpture as that of the lower 

 calycinal spicules already described ; the inner surface is very 

 closely and uniformly covered with small rough grains. In the 

 cœnenchyma of basal stem iind of certain branches, the spicules 

 are very small (0.42x0.22, 0.52x0.25 mm.) and fusiform. Prox- 

 imal to the above described kind of cœnenchyma spicules, there 

 is the second kind consisting of smaller typical spindles with 

 rough grains. 



Locality : the coral ground of Uji Island, south-west of the 

 Province of Satsuma, 80 fathoms ; collected by the author (June 

 1908). The type of this species was secured by the Challenger 

 in the Bay of Sa gam i, 345 fathoms. 



Acis ijhnrtif n. sp. 



(PI. I., fig. 3 ; PL IL, figs. 13-16). 



A perfect specimen measuring 53 mm. in height and 95 mm. 

 in breadth. The colony spreads in one plane, excepting a 

 branch, which sets out nearly perpendicularly from that plane, a 

 fact also observed in Acis pustulata. The branches are sent oft' 



