A MONOGRAPH OF THE EXISTING CRINOIDS 19 



this way. The two first have slender pinnules, and in the last pinnules are entirely 

 lacking in the proximal portion of the arm. 



OBLIQUITY OF THE JOINT FACES, OR INTERIOR OBLIQUENESS 



In order to determine the degree of obliqueness in the angle between the transverse 

 ridge and the radial intermuscular fossa (the dorsoventral axis of the ossicle), Gislen 

 measured the angle between them in series of brachials from the arm bases to more 

 distal portions of the arms. The angle measured was always that of the antipinnular 

 side, and unless otherwise stated was on the distal articular facet. 



Comanthus japonica: IIBr 2 , 75-76°; IIIBr 2 , 68-72°; bracbials 2, 60°; 4, 52°; 



5, 47°; 6, 57°; 7, 58°; 8, 83°; 9, 87°; 11, 85°; 12, 85°; 13, 86°; 14, 89°; 16, 87°; 17, 87°; 

 18, 82°; 19, 86°; 20, 86°; 22, 81°; 23, 82°; 24, 81°; 25, 83°; 27, 78°; 28, 82°; 29, 76°; 

 30, 80°; 31, 81°; distal brachials, 60-76°. 



Eudiocrinus indivisvs: IBr 2 , 75°; brachials 2, 64°; 4, 54°; 5, 56°; 6, 47°; 7, 60°; 9, 

 69°; 10, 78°; 11, 80°; 12, 82°; 13, 86°; 14, 87°. The arm was regenerated from the 

 tenth brachial. 



Pontiometra andersoni: An arm arising from a VBr axillary: Brachial 2, 66° or 

 67°: An arm arising from a IVBr axillary: Brachials 4, 62-67°; 5, 61°; 6, 66°; 7, 62°; 



8, 68°; 9, 67°; 10, 68°; 11, 72°; 12, 77°; 13, 78°; 14, S0°; 15, 81°; 16, 84°. From another 

 series, probably beginning with the ninth brachial: Brachials 9, 69°; 10, 72°; 11, 74°; 

 12, 84°; 13, 86°; 14, 83°; 15, 84°; 16, 87°; 17, 87°; 18, 90°; 19, 85°; 20, 87°. 



Pedinometra flavopurpurea: Brachials 2, 86°; 4, 72°; 5, 80°; 6, 63°; 7, 72°; 8, 78°; 



9, 75°; 10, 88°; 11, 85°; 12, 90°; 14, 90°; 15, 97°; 16, 91°; 17, 90°; 18, 93°; 19, 90°; 

 21, 92°; 22, 91°; 23, 86°; 24, 86°; 25, 87°. 



Asterometra anthus: Brachials 2, 81-85°; 4, 61°; 5, 64°; 6, 65°; 7, 63°; 8, 74°; 

 10,86°; 11,88°; 12,80°; 13,82°. 



Clarkometra degans: Brachials 2, 79°, 80°, 80°, 83°, 84°; 4, 67°, 69°, 70°; 5, 65°; 



6, 57-61°; 8, 80°; 10, 82°. 



Antedon petasus: Brachials 2, 71°; 4, 68°; 5, 62°; 6, 65°; 8, 71°; 10, 79°; 11, 81°; 



12, 82°; 13, 85°; 15, 86°; 16, 87°; 17, 86°; distal brachials about S0°. 



Heliometra glacialis: Brachials 2, 71°; 4, 67°; 5, 64°; 6, 64°; 7, 60°; 8, 67°; 10, 65°; 

 11, 70°; 12, 75°'; 13, 83°; 15, 78°; 16, 87°; 17, 79°; 19, 92°; 20, 84°; 21, 86°; 23, 85°; 

 24, 88°; 25, 85°; 27, 90°; 28, 84°; 29, 89°; 31, 86°; 32, 83°; 33, 84°; 34, 86°; 36, 87°; 

 distal brachials 70-80°. 



Thaumatocrinus jungerseni: Brachials 2, 76°; 3, 72°; 5, 66°; 6, 64°; 8, 69°; 10, 

 75°; 12, 74°; 13, 85°; 14, 80°; 15, 83°; 17, 86°. 



Pentametrocrinus diomedeae: Brachials 2, 62°; 3, 60°; 5, 65°; 6, 62°; 7, 65°; 8, 70°; 



10, 72°; 11, 75°; 12, 75°; 13,82°. 



Atelecrinus helgae: Brachials 2, 80°, 83°; 4, 87°; 5, 85°; 6, 89°. 



Eycrinus carpenterii: Brachials 2, 82°; 3, 86°; 5, 89°; 6, 90°; 8, 90°; 9, 89°; 11, 92°; 



13, 99°; 15, 90°; 17, 92°; pinnules are developed from the eleventh brachial onward. 



Rh izocrinus lojotensis: Brachials 2, 90° ; 4, 90° ; 6, 90° ; 8, 84° ; pinnules are developed 

 from the eighth brachial onward. 



Afetacrinus nobilis tenuis: IBr 2 , 84°; IBr 3 , 75°; IIBr,, 75°; IIBr 2 , 72°; IIBr 4 , 

 73°; IIBr 5 , 74°; IIBr 6 , 74°; IIIBr,, 69°; IIIBr 2 , 77°; IIIBr 4 , 74°; IIIBr 5 , 74°; IIIBr fi . 

 70°; IIIBr r , 71°; IIIBr,, 72°; IIIBr 9 , 72°; IIIBr ]n , 79°; IVBr,, 71°; IVBr 2 , 75°; IVBr 4 , 



