^''[sgY'] PROCEEDINGS OF THE NATIONAL MUSEUM. 215 



FUj. 73. Transverse section of sphincter mnscle of S. lactea. x about 2. 



74. Transverse section of of primary mesentery of S. lactea. Zeiss a 2. 



75, Transverse section of acontium o( S. lactea. Zeiss D 2. 



PlATK XXIX, 



Fiff. 7C. Portion of transverse section of sphincter muscle of S. lactea. Zeiss A 2. 

 77. Saffartia Saiteli Maihoi. Nat. size. 

 7S. Transverse section of sphincter of S, Saiicti Mathwi, 



Zeiss A 2. 

 79. Sagarlia paradoxa. N;i t. si/e. 



SO. Transverse section of sphiiKtcr muscle of S. paradoxa. Zeiua A 2. 

 67. Transverse section of a directive mesentery of S. paradoxa. 

 82 and 83. Adaiuaiaf invulvetis. Nat. size. 



J'LATK XXX. 



Fig. 84. Semidiagrammatic section through the column of S. paradoxa, showing 

 the arrangement of the mesenteries. The roman numerals indicate the 

 cycles of mes(Miteries, x and y the abnormal jiairs. 



85. Transverse section i>f Hithincti^r muHcle of //. iiirolveiiH. 



86. Transverse section of Hphincter mnscle of Aclhiauffe VerriUH. Zeiss A 2. 



87. Transverse section tlirough the upper third of tiie si>hincter mu.scle of A. 



VerriUH. Ziiiss A 2. 



88. Transverse section throuoji the lower third of tiie sphincter muscle of A. 



J^errillii. Zeiss A 2. 



89. Portion of upper part of column of J. Ferrillii, thvs specimen having been 



divided longitudinally. Nat. size. 



Pr.ATK xxxr. 



Fig. 90. Transverse section of mesentery of the second cycle of J. Verrillii. Zeiss A 2. 

 91. Transverse section tlirough tlie base of a tentacle of A. Verrillii. Ze4n A 2. 

 9i', Outer portion of transver.se section of a mesentery of the first cycle of A. 

 I'crrillii. Zeiss A 2. 



93. Actinunge fastiijata. N:it. size. 



94. Transverse section of the sphincter muscle of ./. J'astigata. 



95. Transverse section of the lower part of tiie spliincter nuiscle of A. fastigata. 



Zeiss A 2. 



96. Transverse section of the u]tper p;irt of tin? sphincter muscle of A. fastigata. 



Zeiss A 2. 



97. Transverse section of a mesentery of the tirst cycle of .i. fastigata. Zeiss A 2. 



Pl.ATK XXXII. 



Fig. 98. Chitonanthns pcclinatufi. Nat. size. 



99. View of surface of a dissected specimen of C. pectlnatits which had been 



divided longitudinally. Nat. size. 



100. Transverse section of the sjthincter muscle of C. pectinatus. x 4. 



101. Transverse section of portion of the sphincter muscle of C pectinatus. 



Zeiss a 2. 



102. Transverse section of a mesentery of tlie lirst cyi-]e of <'. pectinatm. Zeiss 



a 2. 



103. Sleplianfirlin hjialonemalis. Nat. size. 



104. Transverse section of si)liiucter muscle of Lriolealia hadia. Zeiss A 2. 



105. Ouluctis calif ornica. Nat. size. 



