154 ACTINLE OF ALHATliOSS KXI'LOKATIONS M' MUliRICH. 



(icmis BOLOCERA, (iosso. 



With the (diar.K'tcis of tlit- iiiniily. 



10. Bolocera occidua, sp. jiov. 



I 'lute \xii, Kii^s. 24-L'7. 



No. 70f5. Station L'TS!!. h;i(. :>! (l_" :;0 ' S. ; loui;. 71 OS' :50 ' W. Dcptli, 122 falli- 



oiiis. 'I'wo .speciiiii'iis. 

 No. 701. Station 2770. I.al. ;■">;!' 0(1' S. ; loiij--. 70 10' ISO " W. I >.'ptli, 77.'l t'i'tl"""'^ 



Tliiiui spt^ciuiciis. 

 No. 1)97. Station 2771. i.at. ni ;{!' S. ; lony-. (i;; W. hcptli, 501 latlioiiiis. Two 

 .sj)etiniens (y»)iiii<;). 



Tlio luiso is evidcMilly adlicrcul, and is sljohtly smaller than tlic col 

 limn, it is mark('<l willi lino radiatiiii; lidj^t's, wliirh are conliiiticd 

 over the limbtis iiixni llie coliimii. 



This is nearly <'yliiidri<-al, expaiidiiio- slightly above, and in Mk^ eon 

 traetod eondi(i(»n can not, he said to possess verruca' or warts, thoii^li 

 the entire siirracc is marked out int<> small ([iiadranuiilar areas by the 

 crossing of vertical and cir<'nlar I'lirrcKvs, jnocesses of mesogloea suj) 

 portino- theecioderm of the <'levated areas (1*1. wii, Im.u. L'4). In the 

 hirgest specimens the height and diaiiu'ter ol' th<' column are about 

 3.111 ]sJear the margin, in most of the specimens, complicated strintnies 

 con Id be seen which, <mi exam inat ion, proNcd to be mesenterial tilaments 

 protrtidiny from open in, ijs formed by the fallin,i;dff of the tentacles. 



The nniii^in i» tentacniate. The tentacles are laiiicand stout, cover- 

 ing" the oreater i)<)rtion of tlnwlisk. They iH'o aii aimed in about four 

 cycles, of which the two iniu'r<ycles each jjossess twelve tentacles, the 

 third «'ycle t wenty-fonr, and tli(> fourth Ibity ci.nht. 'IMie tentacles re- 

 tain their cylindrical shape in the preseiA'ed specimens and are plainly 

 fnrrowed (IM. xxii, V\'j;. LMI). At their insertion into the disc they snd 

 denly diminish in <lianieler, so that they are attached by a short and 

 narrow pedicle; they are thickest immediately above the ])edicle, wheii' 

 the inner tentacU's in the larn'cst specimen measured O.U'"' in diameter, 

 and from that taper j^radnally towards tln^ extremity, wliieli is some- 

 what obtuse. The length of tlie tentacles <>f the innermost cycle in the 

 larjiest si)eeinien was 5"". 



In «'onse(inence of their manner of insertion into the disc the tentacles 

 are readily broken olf, leaving- a circular opening upon the disc which 

 indicates their former position. The opening, lu)wever, is diminished 

 by a circular fold of me.soghea, covered by endoderin, which encroaches 

 u])on it (PI. XXII, Fig. 1*7, tsp); the free edge of the fold is thrown into 

 numerous muscle processes, audit seems probable that by the approxi- 

 mation of the edges of the fold the opening may be completely closed.* 



* Since this was written (';nlnre,n ("01) ha.s deseribed, in a ji.aper on /.'. IdiKjironiis, 

 a Hiiiiilar spiiineter fold, lie points ont, eorreetly, that the spliineter is thrown oti" 

 with the tentacle, and it therefore docs not scrxc to close tho opening left on the 

 .snrfac<< of the disk. My descrijition . w as drawn up IVimi sections thronj^h tentacles 

 still adherent, and the et»nelnsit)n was .somewhat hastily reached that the use of the 

 sphincter fold was to ocoliide the openinji^. 



