3 I Bl l.ll. I l\ 82, I NITEI) STATES NATIOK W. MUSEUM 



in Asteromeira, but closer to the periphery of the ossicle. The fifteenth brachial has 

 i'.» Bepta, about complete. The twenty-third brachial (third hypozygal) lias 18 

 septa, of w hich 7 an complete. 



\ | l l;ni!KI'UIDAE 



Asterometra anthus. In a specimen with arms 80 mm. long the third brachial 

 has 29 Bepta, of which 14 arc complete; in sonic cases the Bepta arc forked; the areola 

 i- narrow; the degree of Btrength is 3. There is a concentric furrow about midway 

 between the periphery <>f the joinl fare and the central lumen. In another case 

 there arc 27 septa. The ninth brachial (second bypozygal) has 28 septa. 



I'll II \--oMETRIDAE 



Stylometra spinifera.- — In a specimen with arms about 90 mm. long the third 

 brachial, following a HBr axillary, has 23 septa, of which 9 are complete and 2 are 

 indistinctly separated ventral bea ns; a couple of septa are forked, and some of the 

 ventral ones are partly subdivided into rows of tubercles; the areola is broad and 

 stout: the degree of Btrength is 3-4. Two third brachials following a IIIBr axillary 

 have 19 and 20 septa, with the ventral beam not subdivided; the areola is as before, 

 but the Bepta are somewhat lower. 



Oceanometra annandaiei. — In a specimen with arms 80 mm. long the HHr 3 has 

 about IS septa. The third brachial has 1!) septa, including 6 complete septa and one 

 ventral beam; the areola is broad, though rather low; the degree of strength is 2-3. 

 The Bepta are stout, running out as ribs to the margin of the ossicle, and there is a 

 marginal growth ledge. 



Stenometra dentata. — In a specimen with an arm length of about 50 mm. the 

 third brachial has is septa, s of which are complete and 2 are low ventral beams; the 

 areola is rather narrow and indistinct; the degree of strength is 2-3. 



( H UUTOMETRIDAE 



Perissomdru cf. aranea. — In a specimen with arms about SO mm. long the third 

 brachial has 22 septa, 4 complete and 2 ventral beams: the areola is indistinct; the 



degr f Btrength is 2. The thirteenth brachial has 20 septa, 10 complete and 2 



ventral beams. The eighteenth brachial has 19 septa and a narrow areola. The 

 twenty-third brachial has 17 septa. The twenty-ninth brachial has 17 septa, of 

 which 2 are complete. The thirty-fourth brachial (sixth hypozygal) has 14 septa, all 

 incomplete, and no areola 



Crossometru ■■< /if< ntrionalis.- A specimen with an arm length of 70 mm. has the 

 IIBr 3 with 17 very low Bepta, about 7 incomplete, with the degree of strength 1. 

 Three firel brachials have 11, It, and 16 septa. A third brachial has 16 septa, 4 

 complete and _' ventral beams; the areola is of medium width, but low. The eleventh 

 brachial has IS Beptft, : * Complete and 2 ventral beams, with the degree of strength 2. 

 In one case the articulation between the first two brachials is a compromise between 

 a synarthry and a sy/.ygy. 



Diodontometra bocki. — In a specimen with the arms 60 mm. long the third brachial 

 has 16 septa, 6 7 complete and the ventral beam weakly developed and partly divided; 



the degree of Btrength is l ; the areola is distinct. 



