184 ZOOLOGY, 
to Rhizocrinus, and was dredged in the Bay of Biscay at. 
the depth of 2435 fathoms. B, Aldrichianus occurred in 
1850 fathoms, latitude 1° 47’ N., longitude 24° 26’ W., off 
the coast of Brazil. With it and also near the Crozet 
Islands occurred the interesting Hyocrinus Bethellianus 
Wyville-Thompson, which bears in some points resemblance 
to the paleozoic genus, Platycrinus. 
Fig. 127.—a, Pentaerinus caput-meduse, half natural size; 6, calyx-disk seen from. 
above, natural size.—F'rom Brehm’s Thierleben, 
The most widely distributed species is the Rhizocrinus 
lofotensis of Sars (Fig. 128), which is closely related to the 
Bourguetticrinus of the chalk formation, and forms the: 
transitional type connecting the Apiocrinide with the 
free-moving, unstalked Antedon. It occurs at the depth of 
