vol.. XVI, 



IS'.):!. 



PROCEEDINGS OF THE NATIONAL MUSEUM. 181 



lialf'-way down. A fourth cycle of imporH'ct mesenteries is i)resent 

 but it is not complete. There are two ])uirs of directives (/>), one ot 

 which, connected with <he deeper siphono,i;lyi)he, is much stronger than 

 the other. The regularity of development of the mesenteries is some- 

 what int(^rrujtted on either side of these smaller directives. Disre- 

 garding the rudimentary nu^senteries of the fourth cycle, a paii- of 

 mesenteries (.r) which are peiCect sik'ccmmI on vnx-Ai side these directives, 

 and next there counts ji pair (y) belonging to the secutnd cycle, which 

 consists of one perfect and one imi)eriect mesenteiy, the latter beings 

 neai-est the directives. Tiiis ariangement occurred on both sides of 

 the directives, an<l in both the specimens examined, and accordingly 

 is })robably normal. 



Acontia are ])resent, as above stated. All the mesenteries exc«'pt 

 those of the iburth cycle and the directives aic gonophoric. The lon- 

 gitudinal musculature is well developed (IM. xxix, Fif?. <S), a marked 

 ](eiinoii being i)r(^sent, the various musch' jirocesses of which aris«^ iu- 

 depeiKkiiitly from the ni«'sog](ea. 



25. Sagartia crispata (IJradloy) Verrill. 

 No. 71S. Staiion, 27!l!t. Laf,., 8 44' N. ; loiij;., 7!) ()!)' W. DepMi, 2!»,U:itli(iiiiN. One 



The >S'. crisimtn described by Verrill ('08) was dredged in from 4 to 

 fathoms in Panama r>ay, and occurred ui)on tlu^ shell of a large Murex 

 {I'hiiUonotns). Tlie si)ecimen which J identify with it with some hesi- 

 tation, was found iu slightly deei)er water in the same locality, and also 

 occurred upon the sluOl of a good sized Piosobranch, ai)])arently one 

 of the Muricida'. It is very much tiatteiu'd in contraction, the margin 

 and tentacles being comi»letely concealed. The base measures about 

 2.7"" iu diameter, and firmly clasps the surface of the shell, which was 

 inhabited by the living nudlusk and not by a Pagurid. The column is 

 wrinkled and somewiiat roughened by miinite elevations ]»i(»(luced by 

 <'ontraction, but does not seem to ])oss(^ss any verruca'. Acontia are 

 emit.ted thr(mgh the column wall a short distance above the lindms, 

 but no series of cinclidal tubeicles could be made ont. The colunni is 

 marked by numerons, irregularly wavy, longitudinal lines of a choco- 

 late brown color, whicli are very distinct upon the wliit(^ giound. 



Not wishing to destroy the single s|»ecimen I can gi\'<^ no jtarticulars 

 regarding the internal stiuctnic. 



From the fact that the acontia arc emitted a short distance above 

 the limbus it is i>ossible that this form is an Adamsia. Its identifica- 

 tion with >S'. cri.sjxda is necessarily uncertain, owing to there being no 

 o])portuniti(^s for a thorough com])arison of the two forms. The difler- 

 ences betw<'en the cohtration in this form and Verrill's description of aS'. 

 cr'iHpata may be due to pieservatiou. 



