MONOGRAPH OF THE EXISTING CRINOIDS. 761 



Myzostomes. 



Figs. 1251-1253. — Myzostomum cro.islandi. (.\fter Boulenger.) 

 1254. — ^f. tenuinpinum. (After von Graff.) 

 1255-1262.— if. costatum. (After Boulenger.) 

 1263. — M. ruhrofasciatum. (After Boulenger.) 



Plate 41. 



Myzontomes. {After von Oraff.) 

 Fig. 1264.— M. fiilicauda. 

 1265. — M. lottgicirrum. 

 i 266. — M. am biguum . 



Plate 42. 



Deformations caused by myzostomes. 



FiG8. 1267-1269. — Three views of a cyst of Myzostomum imUemoesii on nrm of I'aclttilonietia 

 inmqiiaUs. (After von Graff.) 



1270-1272. — Three views of :i large cyst of M. tenvispinum ou arm of Perixsometra angusti- 

 calyx. (After von Graflf.) 



1273-1275. — Three cyst.s of M. tenuispinum on arms of Pachylometra inrnqualis. (After 

 von Grafif.) 



1276. — Part of disk and arm bases of specimen of Promachocrinug kerguelensis. showing 

 cyst of Myzostomum cysticoJum, of)ened 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 Myzostomum deformator ou arm of Eiidoxocrinus 

 alternicimis; in fig. 1277 the cyst Is shown broken open to show septum. 



12S0, 12S1. — Swollen pinnule of Endoxocrinus alternicirrus, inclosing M. deformator, seen 

 from both sides. 

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

 moved, showing base of enlarged pinnule upon which rests Myzostomum 

 asymmetriciim, (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 Oraff.) 



Figs. 1288-1290. — Three views of portion of arm of Peiissometra flexilis containing Myzostomum 



beardi. 

 1291. — Malformerl pinnule of Pachylometra inwquaHs containing Myzostomum wHlc- 



moesii. 

 1292. — Malformed pinnule of Peiissometra flexilis containing Myzostomum loille- 



moesii. 

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



dionalis containing Myzostomum cysticolum. 

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



stomum ciisticnlvm. 



