6 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



[0.] carpenteri, A. [Colobometra} perspinosa, A. [Decametra] informis, and A. loveni 

 [=Colobometra perspinosa]), with the exception of two (Antedon bidens [=0ligometrides 

 adeonae] and A. [Oligometrides] adeonae), which he included among the six species 

 that did not seem to fit into any of the groups established by him. The species with 

 more than 10 arms (Antedon [Cyllometra] manca and A. [C.] disciformis) he placed 

 in the Palmata group. In the Challenger report he mentioned, as a member of the 

 Elegans group, an unnamed new species from the Mergui Archipelago which has the 

 disk extensively plated and a syzygy between the elements of the IBr series. 



In 1889 he described this new species under the name of Antedon [Pontiometra] 

 andersoni and said that it may be referred for the present to the Elegans group, though 

 it differs from the three members of the group which are at present known in certain 

 essential characters. He said that if other species resembling it should eventually 

 be discovered, it may be useful to establish a second group in Series 1 of the Antedon- 

 species, and to call it the Andersoni group. 



In 1891 Dr. Clemens Hartlaub placed the species of Colobometridae discussed 

 by him in the Milberti group (Antedon [Oligometra} serripinna, A. [Iconornetra] japonica, 

 sp. nov., and A. [Colobometra] perspinosa) and in the Palmata group (Antedon [Cyllo- 

 metra] manca, A. [C.] disciformis, A. [Petasometra] clarae, and A. [Cenometra] bella). 

 Antedon (Pontiometra) andersoni he said we are not justified in placing in either the 

 Palmata or Spinifera groups, although it belongs to Carpenter's third series of Ante- 

 don that is, the elements of the IBr series are united by syzygy and the IIBr series 

 are 2. 



When I first suggested the family Himerometridae in 1908 the genera of Colobo- 

 metridae at that time recognized (Oligometra, Cyllometra, and Pontiometra) were 

 included in it. In my paper on new Recent Indian crinoids, published on June 25, 

 1909, the family name Colobometridae appeared as a heading under which was the 

 generic name Cenometra, followed by the description of two new species, C. herdmani 

 and C. insueta, and also the generic name Cyllometra, followed by the description of 

 the new species C. soluta. In a paper on new genera and higher groups of unstalked 

 crinoids published on September 14, 1909, the family Colobometridae was included 

 among the families assigned to the new group Comatulida Oligophreata. In this 

 paper the new family Pontiometridae was established, including the single genus 

 Pontiometra. 



In a paper on the crinoids of the Zoological Museum at Copenhagen published 

 in 1909 I said: 



The genera Oligometra, Cyllometra, Colobometra, and Cenometra differ strikingly from the other 

 genera with which I previously associated them in the family Himerometridae; yet they exhibit a 

 remarkable homogeneity among themselves which suggests that their segregation into a separate 

 family would bring out more graphically their systematic relationships. They all agree in having 

 short cirri composed of short subequal joints which bear upon their dorsal side a transverse serrate 

 ridge, which later passes into paired spines or tubercles, and terminally into single spines or tubercles; 

 the second pinnule is always enlarged, and either the first or third or both may be similar to it; the 

 ends of the component joints of the lower pinnules are always more or less prominent, and are fringed 

 with spines or expanded into lateral processes; one or more of the proximal pinnules is stiffened and 

 more or less spine-like, while the middle pinnules usually and the distal sometimes are also more or 

 less stiffened; the first inner pinnule is usually absent in two out of the four genera. Oligometra 

 and Colobometra are exclusively ten-armed, while the species of Cyllometra are some of them ten- 

 armed, while the others are both ten-armed and multibrachiate. 



