a NATURAL HISTORY BULLETIN. 



tentacle-scales. The same idea has been carried out in 

 O-phiacanthicUz. In the latter group I have designated the 

 apical "mouth-papillae" as tooth-papillae. 



In the identification of the species, I have been very much 

 aided by a pretty large series of typical specimens of the 

 species obtained in the West Indies by the several "Blake" Ex- 

 peditions and described by Mr. Lyman. They were sent to 

 the Yale Museum, several years ago, by Mr. A. Agassiz. I 

 have also used, for comparison, a collection sent to me by Dr. 

 Lxitken, from the University Museum of Copenhagen. 



Order I. OPHIUR.E Milller & Troschel, 1842. 



Ophiurce Ljungman, Oph. Viv., p. 303, 1867. 

 Ophiuridce Lyman, and many other authors. 

 Zygophiurce and Streptophiurce Bell, 1892. 



Family, PECTIN URID^, nom. nov. 



Ophiodermatidce Ljung., Oph. Viv., p. 87, 1867. Lutk., Addit. Hist. 

 Oph., in, p. 87, 1869. 



Since the generic name, Ophioderma, is now recognized 

 only as a synonym of Ophiura, I have changed the name of 

 this family, as is customary in such cases. The name Ophiur- 

 idce cannot properly be used for the small group here includ- 

 ed, because Mr. Lyman and many others have always used it 

 to designate the order Ophiurce, or all the Ophiuroidea ex- 

 clusive of the EuryalcB. 



Ophiura brevispina Say. 



Ophiura brevispina Say, Journ. Phil. Acad. Nat. Sci., V, p. 149, 1825. 



Ophiura brevispina Lyman, Proc. Bost. Soc. Nat. Hist., vn, p. 258, 

 Jan., 1860; 111. Cat. Mus. Comp. Zool., i, p. 18. Verrill, Notes on Rad- 

 iata, Trans. Conn. Acad., I, p. 342, 1868. 



Ophioderma olivaceum Ayers, Proc. Bost. Soc. Nat. Hist., IV, p. 134, 

 1852. 



Ophioderma serpens Lutken, Vid. Meddel., Jan., 1856, p. 7; Add. ad 

 Hist. Ophiur., Pt. II, p. 96. 



Ophiura olivacea Lyman, 111. Cat. Mus. Comp. Zool., I, p. 23, 1865; 

 Lyman, Report Voy, Challenger, Zool. Ophiuroidea, V, p. 9, 1882; 



