DR. "W. B. C-IEPENTER OX THE STEUCTUEE, PHYSIOLOGY, AXD 



PLATE XXXVII. 



Fig. 1. Portion of Skeleton of Arm of Anfedon rosaceus about the middle of its length, 

 seen from its dorsal aspect ; the segments of the Ai-ms and Pinnae remainmg 

 united by their ligaments ; sy, s(j, syzygies. — Magnified 15 diameters. 



Fig. 2. A similar portion somewhat nearer the base, seen from its ventral aspect, 

 showing the Muscular fossfe and the situation of the articulations of the Pin- 

 nules. — Magnified 10 diameters. 



Fig. 3. Basal portion of the skeleton of the Arms with their Pinnules, seen from their 

 dorsal aspect: — J•^ Third Eadial; 1-16, Brachial segments; sg, syzygies. — 

 Magnified 10 diameters. 



Fig. 4. A similar xjortion of the Skeleton of tlie Arms with the Pinnules removed, seen 

 fi-om their ventral aspect ; showing the Interarticular Ligaments, the deep 

 Muscular fossse lying between the vertical ridges, the syzygies, sg, and the 

 articular sockets of the Pinnules, j?, p. — Magnified 15 diameters. 



PL.1TE XXXVIII. 



Fig. 1. Terminal portion of growing Arm; from a preparation in which the soft parts 

 have been made transparent by soda, and the calcareous reticulation is shown 

 by black-ground illumination. — Magnified 120 diameters. 



Fig. 2. Portions of Ai'm near its termination, showing the nearly cylindrical form of its 

 segments: — c, c, Muscular Fosste; p, p, Articular sockets of Pinnules; 

 sg, syzygies. — Magnified 15 diameters. 



Fig. 3. Terminal portion of Pinnule, showing the hooks at its extremity, and tlie series 

 of short segments below the last two. — Magnified 70 diameters. 



Fig. 4. Terminal portion of Skeleton of Arm, with its Pinnules, seen from its dorsal 

 aspect. — Magnified 15 diameters. 



Fig. 5. Segment of Arm from about the middle of its length ; A, distal face ; B, proximal 

 face; c, side viev/. — Magnified 15 diameters. 



[N.B. Figures a and b have been drawn in an inverted position with refer- 

 ence to those in Plate XXXVI. ; the ujijier margin being here the dorsal, and 

 the loioer the vent7-ar\. 



Fig. G. Portion of an Arm that has been broken at the first syzygy, with new arm 

 sprouting from this. — Magnified 10 diameters. 



Fig. 7. Single Arm growing from the Second Eadial, r", the Third Eadial being alto- 

 gether deficient. The segments of this arm have their normal size and pro- 

 portions; and the syzygies occur at their regular intervals. — Magnified 

 10 diameters. 



Fig. 8. Calyx and basal portion of ^.Anns of a specimen which seems at A to have lost 

 one of its Eays at the junction of the First and Second Eadials, a wew Ray 

 and Arms having been produced on a smaller scale ; whilst at B the Second 



