MONOGRAPH OF THE EXISTING CRINOIDS. 659 



At Challenger Stations 186, 187, and 190 (the last probably the station referred 

 to by von Willemoes-Suhm) the large species of Zygometra, Z. micro discus, or 

 Z. elegans, were taken, while at the last in addition to Zygometra only Homalo- 

 mctra denticulata was found. These species of Zygometra occur black and white, 

 while so far as we know Comatula rotalaria and C. Solaris, in common with all 

 the species in the subfamily to which they belong, are always unicolor, red to 

 brown, deep purple or black, with the dorsal side of the arms sometimes lighter. 

 Apparently the station to which von Willemoes-Suhm referred was Station 190, in 

 49 fathoms a depth beyond the known bathymetric range of Comatula rotalaria 

 and of C. Solaris. 



MYZOSTOMUM LONGIPES VON GRAFF. 



ccurrence. Free-living. 



Host. Uncertain. 



Locality. Blake Station 269, off St. Vincent, West Indies, 124 fathoms. 



MYZOSTOMUM CHINES1CUM VON GRAFF. 



Occurrence. Free-living. 



Host. Uncertain. 



Locality. Dredged in the China Sea. 



MYZOSTOMUM LABIATUM VON GRAFF. 



Occurrence. Free-living. 

 Host. Probably Pachylometra incequalis. 



Locality. Near Kandavu, Fiji (lat. about 19 06' S., long, about 178 18' E.). 

 210, 225, or 610 fathoms. 



MYZOSTOMUM ECHINUS VON GRAFF. 



Occurrence. Free-living. 



Hosts, Comanthus parvicirra and probably Pachylometra incequalis or Chari- 

 tometra incisa. 



Localities. Challenger Station 174, near Kandavu, Fiji (latitude about 19 06' 

 S., longitude about 178 18' E.), 210, 225, or 610 fathoms; and between Swatow 

 and Formosa (Taiwan) (lat. 23 20' N., long. 118 30' E.), 17 fathoms. 



Remarks. Comanthus parvicirra is an exclusively littoral type, while both 

 Pachylometra incequalis and Charitometra incisa are from deep water. With the 

 two last there were recorded from Challenger Station 174 Comatella stelligera, 

 Comaster novceguin^ce, Comanthus parvicirra, Stephanometra spicata, and Lampro- 

 metra protectus, all littoral species which certainly did not occur with them in life. 

 It is most likely that Myzostomum echinus from Station 174 lived on one of these. 



MYZOSTOMUM ALATUM VON GRAFF. 



ccurrence . Free-living. 



Hosts.- Leptometra celtica and L. phalangium. 



Localities. The Minch; The Minch, 60-80 fathoms; off Loch Scavaig, Skye; 

 Porcupine Station 13, 1870, off Cape Mondego, Portugal (lat. 40 16' N., long. 

 9 37' W.), 220 fathoms; off Carthagena, Spain, 80 fathoms. 



