The Crinoids from Dr. S. Bock's Expedition to Japan 1914. 7 



was swept from Sagami at a depth of 209 — 728 metres. Comissia gra- 

 cilipes, collected at the Kei-Islands at a depth of 595 — 9(S4 metres, is 

 found at Sagami at 728 metres. Gyllometra discifojviis occurs at the 

 Philippines from — 325 metres, at Sagami the species is found from 

 182 — 728 metres and, finally, Toxomelra at the Philippines and the 

 Sunda-Islands, where the genus is represented by the species paupera, 

 occurring at a depth of — 502 metres, was brought home from Saga- 

 mi from 273 metres. 



A woof of southern forms is also visible at the Goto Islands by 

 the occurrence of the species Gyllometra manca, Psathyrometra Wireni., 

 Metacrinus interrupius and M. nobiUs var. tenuis. 



The Crinoid fauna of the Bonin-Islands was quite unknown be- 

 fore. The 32 species that have been brought home from these islands, 

 show that the crinoid fauna forms a mixture between the South Japa- 

 nese fauna and that of the Sunda Islands and Oceania with a woof 

 of some more peculiar and diverging forms. South Japanese species 

 or ones closely related to these are Comatella brachycirra, Gomaster ser- 

 raia, Gomaniheria grandicalyx, Gyllometra alb opurp urea., Ästerometra ant- 

 hus and Stenometra dentata. Most of the rest are represented by the 

 same or closely-related forms in the waters round the Sunda islands 

 and the Philippines or belong to species with ubiquitous distribution. 

 Eudiocrinus gracilis., formerly reported from Burma, is represented by 

 a somewhat diverging form. Of the same genus there is a new spe- 

 cies Eh. Looeni, which reminds one both of Eu. gracilis and venusttdus, 

 but is otherwise a special type. It is strange that a variety of the 

 East African Gomissia ignotct is found at the Benin Islands. As a 

 parallel in the distribution one might quote Tropiomeira afra and Tro- 

 piometra afra macrodiscus. Both the new genera of the collection also 

 originate h'om these islands. The genus Diodontometra is a Gharito- 

 metrid form, most closely related to Ghariiometra, a genus known from 

 great depths at the Kermadec and Fiji islands, though the new genus 

 differs from Gharitometra by having XX arms and a double opposing 

 spine, an almost unparallelled condition, formerly observed only in the 

 genus Epimetra fam. Golobometridce. The new genus Glarkometra is 

 also interesting especially from an animal-geographical point of view. 

 The genus belongs to the subfamily Perometrina' of Antedonidœ and 

 is most closely related to the East American genus Hypalometra, 



