MONOGRAPH OF THE EXISTING CEINOIDS. 769 



Fio. 1325. Radial pentagon of Antedon biflda after removal of dorBal surface In such a way as 

 to lay open the radiating axial canals and their intercommunicating branches; 

 around central space is irregular calcareous network formed by inosculation of 

 processes sent off from Internal faces of the radinls. (After W. B. Carpenter.) 



PLATE 48. 



FIG. 1326. Ventral muscle pairs of a young specimen of Antedon bifida. (After W. B. Carpen- 

 ter.) 



1327. Proximal portion of arm pair with the lower pinnules of specimen of Antedon biflda 

 with soft parts removed, showing disposition of ventral muscles. (After W. B. 

 Carpenter.) 



PLATE 49. 



FIG. 1328. Tip and central portion of pinnule of Isometra v-ivipara, showing side and covering 



plates. 

 1329. Side and covering plates along ambulacral furrovr of arm of Notocrinus virttis; the 



irregular dark median area represents furrow. 



1330. Tip and central portion of a pinnule of Jfotocrinus virilis, showing the side and cov- 

 ering plates. 

 1331. Spicules of the tentacles of Isometra vivipara. (After Mortensen.) 



PLATE 50. 



FIG. 1332. Dorsal view of specimen of Comatulella brachiolata; the stout pinnules with their 

 tips coiled dorsally are ungrooved ; the much more slender pinnules alternating with 

 them are grooved. 



1333. Specimen of Antedon biftda with regenerating postradial series and IIBr axillary 

 bearing two arms growing upon the first brachials of the original single arm, 

 which has been broken off at the synarthry between the first two brachials. (After 

 W. B. Carpenter.) 



1334. Fragments of arms of Antedon biflda from near their termination, showing the elon- 

 gate and almost cylindrical brachials. (After W. B. Carpenter.) 



1335. Skeleton of basal portions of arms of mature pentacrinoid of Antedon biflda, show- 

 ing the very slightly developed perisomic plates. (After W. B. Carpenter.) 



1336. Vertical longitudinal section of an arm of Antedon biflda from near its base, show- 

 ing arrangement of muscles and ligaments and interruption of these at syzygy. 

 (After W. B. Carpenter.) 



PLATE 51. 



Fio. 1337. Sixteen pentacrinoids of Antedon mediterranea attached to the stem of Fucua, sp. 



from Naples. X 4. 



1338. Pentaerinoid of Antedon mediterranea, from Naples. X 4. 

 1339. Pentacrinoid of Antedon mediterranea, from Naples. X 4. 

 1340. Pentacrinoid of Antedon mediterranea, from Naples. X 4. 



PLATE 52. 



Fio. 1341. Specimen of Capillaster sentosa from Singapore to which is attached an Ophiomaza. 



Natural size. 

 1342. Portion of the column of the type specimen of Mc.tacrinus batheri from the Malay 



Archipelago, 160 fathoms, upon which is growing a parasitic hydroid. Natural 



size. 



1343. Mysoxtomum filifcrum. (After von Graff.) 

 1344. Mjizostrnnum quadricaudatum. (After von Graff.) 



