PLATE XXVI. 



Pentaceros puxctatus, n. sp. (Page 88.) 



From the Upper Challc. 

 Fig. 

 1. Abactiual view of remains of arms; natural size. (Coll. Brit. Mus., E. 2561.) 



a. Lateral view of margin; natural size. 



h. Enlai'o-ed view of single ossicle ; magnified 2 diameters. 



Pentaceros Botsii, Forbes, sp. (Page 80.) 

 From the Upper Chalk. 



2. Actinal view ; natural size. (Coll. Sedgwick Mus., Cambridge.) 

 ((. Lateral view of margin; natural size. 



b. View of isolated ossicle ; magnified 4 diameters. 



MiTRASTEB coMPACTUs, Forle.-^, sp. (Page 67.) 

 From the Upper Glialk. 



3. Abactinal view ; natural size. (Willett Coll., Brigbton Mus.) 



a. View of end of arm ; magnified 4 diameters. 



b. Lateral view of supero-marginal ossicles ; magnified 4 diameters. 



c. Lateral view of infero-marginal ossicles ; magnified 4 diameters. 



Calliderma M0SAiciJJ[, Forties, sp. (Page 9.) 

 From tJte Lower Chalk. 



4. Actinal view of ambulacral groove; magnified 4 diameters. (Coll. Sedgwick 



Museum, Cambridge.) 



a. Actinal view ; natural size. 



b. Infero-marginal ossicle ; magnified 4 diameters. 



