^°l'89:i"J I'ROCEKDINGS OF TIIK NATIONAL Ml'SEUM. 145 



Tlio biiso. dors not seem to have hccii iidlu'rcnt, but i( is soincwliat. 

 Miutilatcil, so thai. it. is not. possible to 1)0. ccitaiii of this. No distinct ion, 

 liowcvci', into (^apituhiin, scapus, and ))hysai is possible. The (;o1iiiiim 

 is (ioiKsiderably wrinkled by contraction and shows no 1 laeeof tid)ercles 

 or waits, and is not covered with l'orei.nn siibslanees. Toward its 

 lower part lon.i;itudiniil {grooves, markinjjf the insertions of tin' in(;sen- 

 tcries, are to be seen, Imt they can not be traie«Ml npward towai'd tlui 

 mavinin for any distiinec,. The heijj;ht of the eolunin is 1.1'"' and its 

 diameter O.S"". 



The niirj'in is simple, and in the contracted specimen covers the bases 

 of the tentacles. I'hese ai'e oidy ei,uht in ninnbei- and arc shoit and 

 stont. 



The conchnla, formed by the prolongation of the lips of the single 

 siphon()^lyi>he, is as lonj^ as the tentacles. On each sid(; of the main 

 I)ortion of the conchnla is a. lobe risin<;' only to about ha!f the heij^ht 

 of the foiiner, and at the snlcnlar extremity of the month is a still 

 smaller nniKiired lobe. 



By cnttin<^ across the column nntil it was almost divided I was able 

 to ascertain the a.rran^^cment and nnmber of the mesentciies withont 

 appreciably nnitilatin^ the specinum. There is only one siphono<;lyphe, 

 which is lonj^ and deep, with thick and firm Avails, almost cartilaginons 

 in thcAV consist<Micy. '^Phe mesenteries are twenty in innnber, arranged 

 in t<'n ]>airs; two of th(\se ai'c <lirectives, and in addition to these there 

 are fonr othei' peilect pairs of abont eipnil width, inakint:" alto<;"ether a 

 l»rincipal cycle of six )>aJis of mescMiteries. The reniainini;' foni- paii's 

 are imperf(M-t and nuwh narrower, and are sitnaied in the snico lateial 

 and lateral intermestMiterial s]»aces. The lon<!;itndinaI innscles are 

 stron;^-. 



The arran^-ement of the mesenteries is the same as that fonnd in 

 rcachia hastata, but, as already stated, the geneial appearance of the 

 animal, the form of its tentacles, and the ])Ossession of a well devel- 

 oped conchnla brin^' it veiy close to P. {Hiphonacfiuid) Hocckii. Whether 

 the latter has also ten paiis of nujsenteries remains to bo seen. It has 

 twelve tentacles, which wonld lead one to suppose that it was hexam- 

 erous, but the species here described shows, as does also Peavhia has- 

 tata with twelve tentacles, how little can be ascertained as to the nnm- 

 ber of the mesenteries from the nnmber of the tcuitacles. It is possible 

 that the s[)ecimen of P. Koreni examined was young and had not de 

 velo])ed its full ipiota. of tentatdes. lean Jiot make any statements with 

 regard to the [)rcs(}nce or absence of reprodnctive elements, not having 

 made microscopical preparations of the mesenteries. 



1 think, however, that thei'ci can be no doubt as to the si»ecilic dis- 

 tin(;tness of this species from that ol)taine(l on the, Norwegian coast. 

 The form of the conchnla is entirely dill(;i'ent, a fact in itself sufticient, 

 in the present state of oui' knowledge of the anatomy of the conchnla 

 bearing Ilalcampida', to warrant tlui establishmentof adistinct specJes. 

 Proc. N. M. 03 10 



