PLATE I. 



Figures illustrative of mouth-parts of Recent and Fossil Asterozoa. 



Fig. 

 1. — Stellasfcr cqiiestris; apical vievr. X 7. (P. 2G.) 



2. — Opltiairirhna iiicrassata (after liudwig) ; apical view after removal of the 

 peristomial plates. (P. 28.) 



3. — Ophiocoma evinaceMs; oral view after removal of the buccal, ventral and 

 side shields, x 7. (P. 27.) 



4. — TJoactis niUj)Iex ; oral view, slightly reconstructed, x 10. (P. 30.) (Coll. 

 Brit. Mus., E. 13154.) 



5. — Protopalxasfer cdvactaci; apical view (after Hudson). X 8. (P. 30.) 



6.— Steiiaster ohttisiis; orR\\iew. X 0. (P. 31.) (Coll. Mrs. G-ray.) 



7.—Stenaster ohfiisiis ; apical view. X 9. (P. 31.) (Coll. Mrs. Gray.) 



8. — Aspidosoma (jrayx; oral view, slightly restored, x 10. (P. 33.) (Coll. Mrs, 

 Gray.) 



9. — Lapirortlitira vi.iltoni ; apical view, x C. (P. 32.) (Coll. Spencer.) 



10. — Laptrorthnra wllasi, n. sp. ; oral view. X C. (P. 32.) (Coll. Ludlow ]\Ius.) 



Lettering BeJating to Ossicles. — 1., lateral buccal shields {Ad^ ; A., ambulacralia ; 

 Ad., adarabulacralia (these are numbered so as to indicate their sequence) ; A^2h> 

 anterior j^rocess of first ambulacral ; A^p^^ posterior process of first ambulacral; 

 «r. ^)., articulating pegs; ilf., madreporite ; Mg., marginalia; M. A. P., mouth-angle 

 plates; 0., odontophore; r., ridge for articulation of side shields with vertebrae; 

 T., torus ; t., teeth. 



Lettering L'elating to Water-vascnlar and Nerrous Systems. — Am. C/i., ambulacral 

 channel; c. (2), canal to first two pairs of tube-feet; F-^, depression for first tube- 

 foot ; Fq, depression for second tube-foot ; I'\ c, opening of branch canal into 

 depi'ession for first tube-foot; //. v., nerve ring; v. r. v., depression for water- 

 vascular ring. 



Lettering lielating to Mnscnlature. — /. T. M., ridge for inter-radial muscle 

 (" adducteur des dents ") between jaws ; M^, ridge for articulation of dorsal 

 transverse muscles ; net. ?»., depression for insertion of ventral longitudinal muscles. 



Lettering Eclating to lieprodiLctice Organs. — g.s., genital sht. 



Note.— Exact diagnoses of the new species mentioned will be given later. The 

 specimens figured on this plate are taken as the holotypes of the new species. 



