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Report on the zoological collections made in the Indo-Pacific Ocean ...

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———ECHINODEKMATA. 155Anted<strong>on</strong>.reg<strong>in</strong>ae A. 2.(2)rA. (3)^ade<strong>on</strong>JB A. r- bdecipiensmilberti A. r*bp<strong>in</strong>uiformis -^^ r'irregularisA. 3.(2)r(2)b_carpenteri A. -olegans A. 3.(i) cpuraila A.gygesA. 2.2.j^.bidensA. -•briareus*A. 3.2.(2)^.aloveniA. — microdiscus A. 3.3.(3)-.XACXINOMETKA.solaria A'E—2— alternansa<strong>in</strong>termediaA'R- •-•2 aA'3.2.3.2.• •paucicirra /-nfl.br aA K—^ —robusta A'R— . r-u bmultifidaA'3.2.2.-- acum<strong>in</strong>giA -•rA'3.2.--copp<strong>in</strong>geriA'—variabilisa< A'3.3.—,-pd.brukesiA'R 2(ab)parvicirra A'3.3. —U'3.(2).(2)^.From <strong>the</strong> table of Anted<strong>on</strong> formuloe some facts become at <strong>on</strong>ceapparent :(a) There are six examples am<strong>on</strong>g <strong>the</strong> more than ten-rayed forms<strong>in</strong> which <strong>the</strong> arms are not a regular multiple of ten—that is, not 20,40, or 80 ; this is clear from <strong>the</strong> sign for <strong>the</strong> palmar or post-palmarbe<strong>in</strong>g <strong>in</strong> <strong>the</strong>se cases placed with<strong>in</strong> brackets.(/3) In aU cases cirri are developed, and <strong>the</strong>se are rarely verynumerous or very l<strong>on</strong>g.(y) In no case is <strong>the</strong> radial axillary a syzygy.A moment's <strong>in</strong>specti<strong>on</strong> of <strong>the</strong> table of formulae for <strong>the</strong> Aci<strong>in</strong>ometrcewill reveal to <strong>the</strong> student a number of <strong>in</strong>terest<strong>in</strong>g facts :(a) Three species have <strong>the</strong> same structural characters, and <strong>on</strong>ly* A study of this species is sufficient to bIiow tlio advantage of Mr. Carpenter'sproposal to register <strong>the</strong> number of jo<strong>in</strong>ts <strong>in</strong> each divisi<strong>on</strong> over my proposal toregister ra<strong>the</strong>r <strong>the</strong> syzygies first of" all, as A. briareus has no syzygies <strong>on</strong> <strong>the</strong>palmars or succeed<strong>in</strong>g jo<strong>in</strong>ts where <strong>the</strong> arms divide aga<strong>in</strong>.

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