EXPLANATION OP PLATE 

 APIOCRINUS TEHUANTEPEC. new species 



1. Fragment of stem containing conical enlargement proximal to tlie 

 calyx, tapering for a distance of 5 columnals from 7 mm. di- 

 ameter to 10 mm. X 4 . 



2 and 3. Stem fragments of larger individuals from more distal partf; of 

 the stem. X |. 



2a and 3a. Joint-faces of the same specimens, slightly frayed at the 

 periphery, having about 56 striae, M'hich extend inward for 

 aliout two-fifths of the diameter to a smooth inner ring sur- 

 rounding the lumen. X |. Collection United States Na- 

 tional Museiiiii. Upper Jurassic, Isthmus of Tehuantepec, 

 ^iexieo. 



APIOCRINU.S ELEGANS (Defrance) 



Upper Jura.ssic, Bathonlen. Calvados, France 



Fios. 4. 46, 4<\ Joint-faces and lateral view of isolated stem fragments, show- 

 ing the radiating striae, and smooth sunken inner ring. After 

 De Loriol, Pal. France, vol. 11, pt. 1, pi. 35, figs, 4, 4b, 4c. 

 Natural size. 

 5.6.7. Different forms of calyx and conical stem enlargement. After 

 De Loriol, pi. 34, figs. 1, 4, 6. I^Jatural size. 



PENTACRINUS SUBANGULARIS. var. ALASKA Springer 



Lower Jurassic. Northern Alaska 



FiQS. 8, 9. Two joint-faces, showing petaloid sectors with crenellae at their 

 margin. Natural si/e. Collection United States National 

 Museum. 



BALANOCRINUS MEXICANUS Springer 



Upper Cretaceous. Tamaulipas, Mexico 



Pig. 10. A joint-face, showing petaloid sectors with crenellae at periphery of 

 the joint. X |. Collection United States National Museum. 



BALANOCRINUS HAITIENSIS Springer 



Tertiary, Miocene. Republic of Haiti 



Fig. 11. A joint-face, showing petaloid sectors, with shorter peripheral 

 crenellae. X 2. Collection United States National Museum. 



5 

 O 



