286 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



c'. Segments of the enlarged proximal pinnules entirely smooth; the distal edges 

 of the component segments may be slightly swollen, or they may be unmodi- 

 fied, but they are never spinous; distal edges of the proximal brachials 

 smooth, or only very slightly produced (Arrakan coast, Burma, Amboina, 

 the Sunda and Philippine Islands and Macclesfield Bank). . robustipinna (2) 



c^. Segments of the enlarged proximal pinnules with prominently everted and 

 spinous distal ends; distal edges of the proximal brachials strongly produced 

 and everted (Singapore and North Borneo) martensi (1) 



THE SPECIES OF THE GENUS HIMEROMETRA. 



1. HIMEROMETRA MARTENSI (Hartlaub). 



Anfedon martensi Hartlaub, Nachr. Ges. Gottingen, Mai 1890, p. 182 (Singa- 

 pore); Nova Acta Acad. German., vol. 58, 1891, No. 1, p. 21, pi. 1, figs. 3, 

 6 (Singapore; more fully described and figured). — A. H. Clark, Proc. U. S. 

 Nat. Mus., vol. 43, 1912, p. 394 (examination of the type-specimen shows 

 that Antedon martensi is the same as the Himerometra crassipinna horn Singa- 

 pore). 



Himerometra martensi A. H. Clark, Smiths. Misc. Coll. (Quart. Issue), vol. 50, 1907, 

 p. 356 (liMed); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (listed). 



Himerometra crassipinna A. H. Clark, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 319 

 (specimen erroneously labeled "Japan"); Smiths. Misc. Coll. (Quart. Issue), 

 vol. 52, 1908, p. 213 (compared with H. bartschi, new species, and with 

 H. robustipinna, new species); p. 214 (compared with H. magnipinna, new 

 species); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 7 (listed); Vidensk. 

 Medd. fra den naturhist. Forening i K0benhavn, 1909, p. 155 (Singapore); 

 Proc. U. S. Nat. Mus., vol. 43, 1912, p. 394 (British North Borneo; Singapore, 

 the type of Antedon crassipinna agrees in every particular with specimens of 

 Himerometra crassipinna from Singapore); Crinoids of the Indian Ocean, 

 1912, p. 116 (Singapore and Pulau Ubin, Singapore; the record from Amboina 

 refers to H. robustipinna, and that from Cochin China to H. magnipinna). 



Range. — Known from Singapore, Pulau Ubin, oflF the northeastern 

 corner of Singapore Island, and from British North Borneo. 

 Depth. — Littoral. 



2. HIMEROMETRA ROBUSTIPINNA (P. H. Carpenter). 



Actinometra robustipinna P. H. Carpenter, Notes from the Leyden Museum, 

 vol. 3, 1881, p. 201 (Moluccas).— A. H. Clark, Notes from the Leyden Mu- 

 seum, vol. 33, 1911, p. 182 (shown not to be an Actinometra at all, but to 

 belong to the " Savigni group" of Antedon, falling in the genus Himerometra; 

 doubtfully referred to H. crassipinna from Singapore, i. e., H. martensi); 

 Crinoids of the Indian Ocean, 1912, pp. 116, 117 (doubtfully referred to 

 H. crassipinna from Singapore, i. e., H. martensi). 



Antedon kraepelini Hartlaub, Nachr. Ges. Gottingen, Mai 1890, p. 183 (Akyab, 

 Burma); Nova Acta Acad. German., vol. 58, 1891, No. 1, p. 22, pl. 2, figs. 

 15, (21) (Akyab, Burma; more fully described and figured). — A. H. Clark, 

 Smiths. Misc. Coll., vol. 60, 1912, No. 10, p. 18 (type-specimen appears to 

 be a small individual of H. robustipinna). 



Antedon crassipinna Hartlaub, Nachr. Ges. Gottingen, Mai 1890, p. 185 (Am- 

 boina; but not specimen from Cochin China, which represents H. magni- 

 pinna); Nova Acta Acad. German., vol. 58, 1891, No. 1, p. 32, pl. 1, figs. 

 1, 5, 10 (Amboina; but not specimen from Cochin China, which represents 

 H. magnipinna; more fully described and figured). 



