Plate VIII. 



Fig. I. 



- 2. 



- 3- 



~ 4- 



- 5- 



- 6. 



- 7- 



- 8. 



- 9- 



- lO. 



- II. 



- 12. 



- 13- 



- H- 



- 15- 



- i6. 



- 17- 



- i8. 



- 19- 



- 20. 



- 21. 



- 22. 



- 23. 



- 24- 



^ 26. 



- 27. 



- 28. 



- 29. 



- 30- 



- 31- 



- 32- 



- 33- 



- 34- 



- 35- 



- 36. 



- 37- 



- 38. 



Tube foot of DorocJdaris papillata^ shows the arrangement of the spicules. Obj. o. Oc. o. 

 a. b. Spines of Cidaris a/Jims (U. S. F. C.) ; a. primary actinal spine, 3/i. b. primar}' abactinal spine, '/i- 

 Actinal primary spine of Dorocidaris papillata. '/j. 



— — - - Stereocidaris ingolfiana. ^/i. 



Secondary abactinal spine of Hypsiechiiius corojiatus. Obj. II. Oc. o. 



Valve of a small globiferous pedicellaria of Stereocidaris caitaliculata^itovsx'Ca^^\A&. Obj. II. Oc.I. 

 Globiferous pedicellaria of Genocidaris inacitlata\ shows the double poison gland. Obj. II. Oc. I. 

 Valve of a large globiferous pedicellaria of Stereocidaris cajialicir/ata, from the side. Obj. II. Oc. I. 

 Point of a primary abactinal spine of Hypsieclmius coronatus. Obj. II. Oc. o. 

 Primar\' abactinal spine of Stereocidaris ingolfiana. ^'^. 



Valve of a large globiferous pedicellaria of Stereocid. ingolfiana^ from the side. Obj. II. Oc. I. 

 Spine from the peristome of Dorocid. papillata. Obj. 00. Oc. o. 



— - — - — — from the side. Obj. 00. Oc. o. 



Secondary spine with campulla from the abactinal side of Dorocid. papillata. Obj. o. Oc. o. 



Piece of an actinal spine of Hypsiech. coronatus. Obj. II. Oc. III. 



Large globiferous pedicellaria of Stereocidaris ingolfia^ia. Obj. II. Oc. o. 



Actinal spine of Hypsiech. coronatus. Obj. o. Oc. o. 



Piece of an abactinal primary spine of Hypsiech. coronatus. Obj. II. Oc. o. 



Secondary spine of Stereocidaris ingolfiana. Obj. 00. Oc. o. 



Spine from the peristome of — — Obj. o. Oc. o. 



Point of a valve of a small globiferous pedicellaria of Stereocid. ingolfiana. Obj. \ . Oc. I. 



— - — — pedicellaria of Porocidaris purpurata. Obj. V. Oc. o. 



— - — — small globiferous pedicellaria of Sterocid. ingolfiana. The two outer- 

 most teeth coalesced in the point. Obj. V. Oc. III. 



-25. Ambulacral and interambulacral area of Hypsiechinus coronatus. t'l- The sutures of the 

 ambulacral area are not so distinct in the animal, as here in the figure. 

 Point of a valve of a large globiferous pedicellaria of Stereocid. ingolfiana. Obj. V. Oc. o. 



— - — - — — — - Dorocid. papillata. Obj. V. Oc. o. 

 Small globiferous pedicellaria of Stereocid. ijigolfiana. Obj. II. Oc. o. 



Valve of a large globiferous pedicellaria of Stereocid. ingolfiana., from the inside. Obj. II. Oc. I. 

 _ . . small — _ . _ _ _ . side. Obj. II. Oc. I. 



(com p. Fig. 21.) 

 Valve of a globiferous pedicellaria of Stereocidaris incerta. Obj. A A. Oc. III. (Zeiss.) 



— - - large globiferous pedicellaria of Stereocid. canalicnlata^ from the inside. Obj. II. Oc. I. 

 Tridentate pedicellaria of Arbacina forbesiana. Obj. II. Oc.I. 



Valve of small globiferous pedicellaria of Stereocid. Mortenseni, from the inside. A A. Oc. I. (Zeiss.) 



— - large — — - — sp. , from the in,side. (Challenger. St. 156. 

 comp. p. 26.) Obj. II. Oc. o. 



Valve of small globiferous pedicellaria of Stereocid. ijigolfiana, from the inside. Obj. II. Oc.I. 



— - large — — - Acanthocidaris curvatispinis ., from the inside. 

 Obj. II. Oc. I. 



Ophicephalous pedicellaria of Hypsiechinus coronatus. Obj. II. Oc. o. | 



