PLA TE X.
               A C(TNOC!RINUS (SA CCO('RINUS) SPJfIRA DfA 7S. HAL 1,.
                                          Page .370.
FIG. 1. In internal cast of a specimen of this species, showing the characters
as described.
                            UNSHOD OCRINUS ? R Ec(i'S, HAL!L.
                                         Page 36a.
FIG. 2. View of an interior cast, presenting one of the interradial areas,
and two of the radial
             series.
                         OL 1YPTASTER OCCIDENTArIS, H.IILL.
                                         Page 369.
FIG. 3. Lateral view of a well preserved cast of this species.
                        G L YPTA STER PENTA NGVLA M:   iRIS,  1~ 1A,1.
                                         Page 369.
FIG. 4. An internal cast of this species, preserving the impressions of the
plates.
                          MEL OCR0RINUS I- El? NE TILr, TimoOSI.
                                         Page 372.
FIG. 5. An internal cast of this species. The constriction between the arms
is not quite so deep
             as in some examples.
                         LiAMPTEROCRLNv S IYrLAT'PUS, IL-L L.
                                         Page 374.
FIG. 6. Lateral view of a well preserved cast of this species, which preserves
the markings of
             the plates in an unusual degree.
                       MA C(ROSTYL OC'RINUS S'TIRA T'US, /ILA r..
                                         Page 371.
FIG. 7. External characters of this species, taken from a gutta-percha cast
in the natural mould.
      8. The internal cast of the same individual.
                           GLYPTO( 'RINUS NOBILIS, H[ALL.
                                         Page 372.
FIG. 9. A view of the external surface as obtained from an impression in
the natural mould.
" 10. Lateral view of an internal cast of this species. The base has
been broken off.
                       (GLY ITOCRINUS ARMOSUS, M '( ,HESNEY.
                                         Page 373.
FIG. 11. Lateral view of an unusually well preserved internal cast, on which
the boundaries of
            the plates are well marked. The similarity in general form between
this species and
            G. Inobilis is very remarkable, the conspicuous difference in
the cast being the strong
            elevated proboscis in the latter; while in the former the organ
occupying this position
            curves backwards, lying clo~se upon the summit, and is directed
downwards to the
            line of the arm-bases.