MONOGRAPH OF THE EXISTING CKINOIDS. 767 



PLATE 40. 

 Mjjzostomes. 



FIGS. 1251-1253. Myzostomum crosslandi. (After Boulenger.) 

 1254. M. tenuispinum. (After von Graff.) 

 1255-1262. M. costatum. (After Boulenger.) 

 1263. M. rubrofasciatum. (After Boulenger.) 



PLATE 41. 



Myzostomes. (After ran Graff.) 

 Fio. 1264. M. flUicauda. 

 1265. M. longicirrum. 

 1266. M. amUguum. 



PLATE 42. 



Deformations caused 6j/ myzostomes. 



FIGS. 1267-1269. Three views of a cyst of Myzostomum mHemoesii ou arm of Pachylonietru 



inccquaUs. (After von Graff.) 

 1270-1272. Three views of a large cyst of M. tenuispinum on arm of Perissometra angusti- 



calyx. (After von Graff.) 

 1273-1275. Three cysts of M. tenuispinum on arms of Pachylometra inaegualis. (After 



von Graff.) 

 1276. Part of disk and arm bases of specimen of Promachocrinus kerguelensis, showing 



cyst of Myzostomum cysticolum, opened in order to show pair of myzo- 



stomes. (After Mortensen.) 



PLATE 43. 

 Deformations caused by myzostomes. 



FIGS. 1277-1279. Three views of a cyst of Myzustomum defonnator on arm of Endoxocrinus 

 altemicirnis ; in fig. 1277 the cyst is shown broken open to show septum. 



12SO, 1281. Swollen pinnule of Endoxocrinus alternicirrus, inclosing M. defonnator, seen 



from both sides. 



1282. Portion of arm of Endoxocrinus aJternicirrus, with pinnules of nearer side re- 

 moved, showing base of enlarged pinnule upon which rests Myzostomum 

 asymmctricum. (After von Graff.) 



1283-1285. Thickened portion of arm of Endoxocrinus alternicirrus inclosing Myzostomum 

 pentacrini. (After von Graff.) 



1286, 1287. Two views of cyst of Myzostomum platypus upon disk of Comanthina schle- 

 gelii. (After von Graff.) 



PLATE 44. 

 Deformations caused by myzostomes and otherwise. (After von Graff.) 



FIGS. 1288-1290.- Three views of portion of arm of Perissometra flexilis containing Myzostomum 



beardi. 

 1291. Malformed pinnule of Pachylometra inasqualis containing Myzostomum wille- 



moesii. 

 1292. Malformed pinnule of Perissometra flexilis containing Myzostomum wille- 



moesii. 

 1293, 1294. Dorsal (1293) and ventral (1294) view of cyst on arm of Conmctinia meri- 



dionalis containing Myzostomum cysticolum. 

 1295. Cyst on ventral surface of arm of Comactinia meridionalis containing Myzn- 



stnmiim cysticolum. 



