If)!! A( TINLE OF ALHATKO.SS EXI'LOKATIONS MURKICH. 



11. Boloceia pannosa, sj). ikiv. 



Plate XXII, Figs. 2S and 20. I'l. xxiii, FiJ,^ .SO. 



No. 72:). Station 2839. Lat. 3.'!' 08' N. ; lon.t;-. 118- JO' W. ])e])tli, 111 fatlionis. 

 Kinlit spf^ciinens. 



This tbiin, in its preserved coudilioii, presents at the first ^hiiiceoiily 

 a remote siniilarity to other species of Bolocera. One misses the ro- 

 bust appearance and the large, st(mt tentacles, and finds instead a 

 ragged mass. Closer observation re\eals, however, many jtoints of sim- 

 ilarity to B. tueduv, and it is necessary to consider both as l)elonging 

 to the same family, and probably also to the same genus. 



The base is oval and attached. In average specimens it measured 

 7'"" in leugtli and 2.5'"' in breadtli. It is thin, especially toward the 

 center, allowing the mesenteries and the dark, wine-colored pigment 

 of the mesenterial filaments to be indistinctly i^erceived. Toward the 

 periphery radiating and concentric grooves are readily made out. mark- 

 ing off the surface into small quadrangular areas. 



The column is low; in none of the specimens does it exceed 0.7'='" in 

 height, and it is folded back upon itself, so that the laargin and liuibus 

 are nearly in contact. Immediately below the region where the bending 

 back oc<Mirsis a relatively strong, circumscribed endodermal sphincter, 

 which is, no doubt, the cause of the reversion of the margin. This 

 sphinctei*(IM. XXIII, Fig. 30) consists of a main mesogkeal process x^roject- 

 ingout almost at a right angle to the column wall and giving rise to 

 numerous secondary processes mainly on its marginal side, other proc- 

 esses arising below it directly from the column wall and grading off 

 into the ordinary circular nuiscle processes. This spkincter, it will be 

 noticed, is situat«Ml low down on the column wall, some distance away 

 from tlu^ margin. iMuscle jjrocesses supporting circular muscles occur 

 above it, but they are not specially aggregated to form a sphincter. 

 The sphincter which is jn-escnt is to be regarded as a lower si)hincter, 

 the marginal sphincter not being develo]»cd. 



The surface of tiie column is divided into small quadrangular areas 

 by longitudinal and circular lines corresponding to the radiating and 

 <'oncentri<' grooves of the base. No warts or verruca-, howe\er, seem to 

 be present, nor are there any very decided mesogio'al ]>rocesses sup- 

 l)orting the quadrangular areas as in B. occhlua. 



The entiri! animal is of a i)ale rosy tint, or in some cases salmon- 

 colored, the mesenterial fihunents being of a deep wine purple. Prob- 

 ably in life the colors were more i)ronouuced, resembling the coloration 

 wliicli seems usual to the IJoloccrida'. 



The margin is tentaculate. The tentacles are numerous and strongly 

 entacniieous, arranged apparently in about seven cycles, (J, 0, 12, 24, 

 48, 90, 102. The inner tentacles measure about .'5.7'"'" in length, and 

 ai>parently are not capable of being contracted to any very great ex- 

 tent. In their general structure the tentacles resemble those of B. tue- 



