226 NATURAL HISTORY BULLETIN 



Plate XI 



Figure 1. LopIia.sU'r r<i<Uaius Pem-ier. Portion of dorstil side ol' a ray X .">. 



Figure la. Tiie saiiio siiccinien. Under side of portion of a ray of an al- 

 coholic speciuien; jw, podia; a, adambulacral spines; i,i, infcroniar- 

 ginals; m, supcronsarginals; X 5 



Figure lb. The same. One of the dorsal parapaxilla?; X 10 



Figure Ir. The same. Adambulacral spines of one plate; X 1<) 



Figure 2. Ixemaater pahnatus Perrier. Dorsal view of a part of the disk 

 and tAvo rays, X 6. Many of the dorsal spines are removed, to show- 

 plates; p, doi-sal pore 



Figure 3. JRo.mstcr alexandri Perrier. Part of disk and two rays of a 

 young specimen, dorsal view; p, dorsal pore; i,i, large basal iuterradial 

 plates; m, madreporic plate. The spimiles are partly removed to show 

 form of plates ; X 3. 



Figure 3fl. The same. Tavo of the dorsal plates with rosettes of spinules, 

 X 16. 



Figure 3&. The same. Two of the dorsal spinules more enlarged. 



Fignire 4. Asierinidcs folium (Liitk.) Dorsal view of a six-rayed s[ieci- 

 men, about natural size. 



Figure 5. Blal'iaster conicus Perrier. Under side of disk and jaw of the 

 specimen on plate in, figure 4, Bahama Exped. ; spinules are removed 

 from part of the plates; j, jaw-plate; a, a, adambulacral plates; ai, fli, 

 adoral adambulacral plates, one with spines; io., ia^, interactinal plates; 

 o, ol, oil, impaired interactinal plates; p, pit where a pedicellaria was 

 seated. X 5. 



Figure 6. Porania austera Verrill. Type. Dorsal view of portion of disk 

 at base of rays; s, s, superomarginal plates; i, i, inferomarginal plates; 

 .;, j their secondary row of spinules. X f). 



Figure 6a. The same specimen. Under side of a portion of the disk and 

 base of a ray. X 5. 



Figure 7. Renricia sexradiaia (Perrier). Under side of a ray. Specimen 

 from Bahama Expedition; m, inferomarginal plates; i, interactinals; 

 ff, adambulacrals; .s, ^f, adambulacral spines. X 16. 



Plate XII 



Figures 1, la. Luidia alternata hicolor Verrill. Type. Dorsal and ven- 

 tral views of a })art of a ray. X 3. 



Figures 1ft. The same. Section of a ray; diagramatic; a, a, ambulacral 

 single ampulte; p, podia; ap, ambulacral plates; ad, adambulacral 

 plate and spines; m, marginal plate and spines; pa, dorsal paxillfe. 



Figure Ic. The same. One of the marginal spines; the shaded portion is 

 chocolate-brown; the unshaded distal part is white. X 13. 



Figure 2. Astropecten 7iuttingi Verrill. Type. Dorsal side of proximal 

 part of a ray. X 6. 



Figure 2a. The same specimen. Under side of portion of a ray. X 10. 

 From Bahama Expedition. Station '58. 



Figure 2&. The same. Diagram of profile of a border of a ray. 



