NO. 1 DURHAM, BARNARD: EASTERN PACIFIC STONY CORALS 89 



Dimensions of holotype: Height 10 mm, calice 6.0 by 7.5 mm. 



Holotype: AHF no. 16, with 2 paratypes. 



Type locality: Sta. 55-33, northeast of Charles Island, Galapagos, 

 60 fms. 



Material examined: Sta. 55-33 (4). Bottom sample 455 (1). Cat. 

 nos. 50.1-50.2. 



Kionotrochus (?) hoodensis Durham and Barnard, new species 



Plate 12, figs. 51a-d 



Corallum turbinate to subtrochoid, moderately small, attached by a 

 small pedicle which is usually broken ; calice slightly oval ; septa thin, in 

 4 cycles, septal interspaces 3 times as wide as thickness of primary septa; 

 primary and secondary septa exsert (1.5 mm), third and fourth cycles 

 successively less exsert ; primary and secondary septa reach columella but 

 are attached to it only by individual trabeculae; tertiaiy septa extend 

 two-thirds the distance to the columella, quaternary septa extend one- 

 fourth to one-third the distance to the columella; septa well-rounded 

 above, inner edges vertical and crinkled, undulations usually regular in 

 distances apart and somewhat contorted at the vertices, occasionally 

 producing a blunt spinule; septal faces with well-spaced, fine, blunt 

 granules; costae granulated, prominent and rounded, becoming indistinct 

 towards base; costal interspaces irregular in width, usually as wide as 

 costae at top of corallum, narrowing out towards base; at top of coral- 

 lum they are flat-bottomed and contain incipient costal ridges ; columella 

 fascicular, composed of twisted and contorted pieces, approximately 

 one-third the width of the calice. 



Remarks: This species may be separated from Kionotrochus avis 

 new species which it closely resembles, by being attached, by the flat- 

 bottomed costal interspaces at the top of the corallum, the costae becom- 

 ing somewhat indistinct towards the base, and by the incipient costae 

 evident in the interspaces at the top of the corallum. Cat. no. 51.1 (Sta. 

 190-34) has very high, rounded, granulated costae which are much more 

 in evidence towards the base than in other members of the species. 



This species has been referred to the genus Kionotrochus because of 

 the trochoid corallum, rounded costae which extend almost to the base 

 of the corallum, and its close resemblance to Kionotrochus avis. The 

 presence of a pedicle by which it is attached is contrary to the general 

 definition of the subfamily Turbinoliinae, but the resemblance to the 

 genus CyathoceraSj where it would be placed if put in the Caryophyll- 

 iinae is lessened by the trochoid corallum, costal characteristics, and the 

 color of the skeleton, which is chalk-white. The color of the specimens 

 of the species at hand belonging to the Caryophylliinae is usually slightly 

 ochraceous. 



