REPORT OF NATIONAL MUSEUM, 190!). 



131 



Clabk, Austin Hobart — Continued. 



Isocrinus, Endoxocrinus, and Meta- 

 erinus, and shows the development 

 of the Endoxocrinus type from the 

 others ; small stems of Isocrinus 

 are shown to resemble the stems 

 of the Bourgueticrinidse. 



The homologies of the arm 



joints and arm divisions in the re- 

 cent crinoids of the families of the 

 Comatulida and the Peutacrinitidte. 

 Proc. U. 8. Nat. Mits., 

 XXXV, No. 1636. Oct. 30, 

 1908, pp. 113-131, figs. 

 1-28. 

 The homologies of the arm di- 

 visions and of the proximal post- 

 radial elements are traced through- 

 out the two groups consideredi 

 On the basis of arm structure the 

 recognition of Loven's Phiuifxjenin 

 as distinct from Comaster, and of 

 four recent genera. Isocrinus, Hy- 

 palocrinus, Endoxocrinus, and 

 Metacrinus of recent pentacrinites, 

 are suggested. 



Some points in the ecologj- of 



recent crinoids. 



Am. Katuralist, XLii, No. 

 503, November, 1908, pp. 

 717-726. 

 Theories are suggested to ac- 

 count for the increase of size with 

 depth, the restriction of littoral 

 crinoids to regions of heavy pre- 

 cipitation, and the coloration of 

 the crinoids. 

 The recent crinoids and their 



relation to sea and land. 



Geog. Journ. xxxii. No. 6, 

 Dec, 1908, pp. 602-607. 

 This is substantially a reprint 

 of two papers in the American 

 Naturalist, " The genus Ptilo- 

 crinus ", and " Some points in the 

 ecology of the recent crinoids ". 



New genera and species of 



crinoids. 



Proc. Biol. 8oc. Wash., xxi, 

 Dec. 10, 1908, pp. 219- 

 232. 

 Thirteen new species and one 

 new genus are described from the 

 collections of the Museum at Co- 

 penhagen, Denmark. 

 Preliminarv notice of a collec- 



tion of recent crinoids from the 



Philippine Islands. 



Smithsonian Misc. Colls., 



52, Quar. Issue, Pt. 2, 



No. 1820, Dec. 23, 1908, 



pp. 199-234. 



Based on the first consignment of 



crinoids received from the steamer 



Clark, Austin Hobart — Continued. 



Albatross as the result of her work 

 among the I'hilippine Islands. 

 Two new genera, Comatella (Co- 

 masteridiB) and Eumetra (Ante- 

 donidse) and 20 new species are 

 described, the latter belonging to 

 the genera Metacrinus, Catopto- 

 mctra, Eudiocrinus, Himerometra 

 (7), Cyllometra, Oligometra, Calo- 

 metra (2), Ptilometra, Charitome- 

 tra, Perometra, Eumetra, Iridome- 

 tra, and Triehometra ; one of the 

 species of Himerometra is from 

 Port Denison, Australia. 



A revision of the crinoid fami- 

 lies Thalassometridie and Himero- 



metridse. 



Proc. Biol. 8oc. Wash., xxii, 

 Jan. 9, 1909, pp. 1-22. 

 The species referable to the fam- 

 ilies Himeromelridse and Thalas- 

 sometridie are distributed among 

 25 genera, of which 17 are new. 



The genus Encrinns. 



Ann. May. Xat. Hist., 8th 

 ser.. Ill, No. 15, March, 

 1909, pp. 308-310. 

 A discussion of the type species 

 of Encrinus. 



Two new Australian crinoids. 



Proc. Biol. 8oc. Wash., 



XXII, March 10, 1909, pp. 



39-12. 



Gives descriptions of two new 



crinoids from the collections of 



the German steamer Gazelle. 



Red Sea crinoids. 



Am. Naturalist, XLiii, April, 



1909, pp. 253-256. 



A review of a paper on the 



same subject by Mr. Herbert C. 



Chadwick. adding a large amount 



of historical data. 



New recent crinoids from the 



Indian Ocean. 



Proc. Biol. 8oc. Wash., xxii, 

 April 17, 1909, pp. 75-86. 

 Ten new species are described 

 from the collections made by the 

 Royal Indian Marine Surveying 

 steamer Investigator, distributed 

 among the different genera as fol- 

 lows : Eudiocrinus, Dichrometra, 

 Cyllometra, Calometra (2), Cro- 

 talometra, Pachylometra (2), Eu- 

 metra, and Metacrinus. 



The type of the genus Comaster. 



Proc. Biol. 8oc. Wash., xxii, 



April 17, 1909, p. 87. 



The type of the genus Comaster 



is shown to be the somewhat 



anomalous species Alecto multi- 



fida J. Miiller. 



