CLARK: DISTRIBUTION OF UNSTALKED CRINOIDS 213 ZOOLOGY. — The hathymetrical and thermal distributidn of the unstalked criniods, or comatulids, occurring on the coasts of China and Japan. Austin H. Clark, National Museum.^ The fauna of the coasts of China and Japan includes 92 recog-nized species and subspecies of comatulids, of which 2 are prob-ably best considered as local aberrant forms, so that the actual number may be placed at 90. Of these 90, 61 belong to the Indo-Pacific fauna, characteriz-ing the Southern Japanese division of that fauna, which ranges from Hong Kong and Formosa to the Korean Straits and thence eastward to Tokyo Bay; 22 are Malayan, wide ranging types, each with a distribution different from that of the others; 4 are Antarctic, reaching Japan from the northeastward by way of Alaska and the Aleu-O 16 c4 0.:. 4U tian Islands; and 3 (plus varieties of one of them — 5 in all) are Arctic. One of these last, Heliometra gla-cialis maxima (with Heliometra glacialis biarticulata and Helio-metra glacialis hrachy-mera) is very closely related to Heliometra glacialis glacialis, _ i a., ^ . j-a-+ , +. r . Fig. 1. Ihe frequency at different depths oi which occurs m the ^j^g comatulids of the coasts of China and Japan. Arctic Ocean from The Species of the Indo-Pacific Fauna; west of Greenland to TheSpeciesof the Malayan Fauna; + V. TT Q rl "^^^ Species of the Arctic and Antarctic Faunas; the Kara bea, and The Total for all Species. southward to Nova Scotia and northern Norway, but the other two are of quite different origin; Psathyrometra erythrizon was originally Antarc-tic, like Psathyrometra fragilis, to which it is closely related, and entered the Seas of Okhotsk and Japan from the northeastward ; Thau7natometra tenuis is most closely related to species in the ' Published by the permission of the Secretary of the Smithsonian Institution. 0-50 50-100 XOO-150 150-200 200-250 250-300 300-350 360-400 400-450 450-500 SOO-550 550-600 600-650 650-700 700-760 750-eCO eoo-650 I' 660-900 900-950 950-1000 1000-1100 1100-3000
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