14 LARVIKORM CRI -VOIDS 



Description. — The calyx is very small, averaging about 1.3 mm. in height. 

 The height is considerably greater than the maximum width, giving the body 

 a general pyriform shape which varies in some specimens to truncated conical 

 or truncated sub-pyramidal. The radials constitute more than half the total 

 height and the basals make up somewhat more than half of the remainder. 



The basal ring is circular in outline and enlarges slightly and more or 

 less regularly upward above the stem facet which occupies the entire proximal 

 surface. The surface of this portion of the calyx shows no indications of 

 sutures but one individual whose base was broken appears to have three basal 

 plates one of which is somewhat larger than the others. The basals of this 

 specimen apparently did not form a basal cup, but extended solidly to the 

 center. 



The radials are elongated and wider above than below. Their height 

 is equal to twice their mean width or more. A broken specimen shows that 

 the plates are about .08 mm. thick. The radials are gently convex longitud- 

 inally and more strongly so transversely. The transverse convexity is either 

 regular, resulting in a circular cross-section of the calyx, or it is somewhat 

 accentuated along the central part of the radials. producing a calyx with 

 slightly flattened sides along the middle of which extend the interradial su- 

 tures. The distal surfaces of the radials bear the brachial openings and the 

 corners of the radials upon either side are more or less steeply notched pro- 

 ducing concave depressions into which the orals extend. 



Rowley reported that in some of his larger specimens the radials are 

 axillary but this condition was not observed in any of our individuals ex- 

 amined. The specimens are all highly calcified and many of them apparently 

 more or less worn so that it is difficult to determine their detailed structure. 

 The best specimens examined, and these are all comparatively large examples, 

 did not possess more than one arm to a radial. 



This species has no well developed articular facets similar to those of 

 Kallimorphocrinus. The position of the arms is indicated by n small suboval 

 or rectangular depression on the upper surface of each radial surrounded 

 by a thin lip which extends directly upward from the radial with whose 

 surfaces it is continuous. There is no beveling of the radial below this lip. 

 the outer portion of which is probably morphologicallv similar to the trans- 

 verse ridge in Kallimorphocrinus. The brachial openings surrounded by the 

 lips are directed straight upward and are very narrow and depressed owing 

 to the size of the oral crown which covers a large part of the ventral surface. 

 The general appearance of the brachial openings suggests that the arms of 

 this crinoid possessed no well organized supporting calcareous skeleton. 



A subhemispherical oral crown surmounts the calyx and occupies the 

 greater part of its ventral surface. It is composed of five plates of which 

 the posterior one is the largest, being both wider and longer than the others. 



