Jl,^ XV 



'] l'Ii(Hl-;i';iJIN(i.S OF 'I'lIK NA'I'IONAL MUSKUM. 189 



iiiiiiisliiii.!; ill siz(; and liiially (lisaiiiicaiiii^ a litllr. injciiial to tlu' inid- 

 loii^itiMliiial liiM', oi'llic Mies«'iit<'iy. 



As slalcd above, Vcnill (ni^iiially dcsciihcd lliis loniias a variety 

 ofyl. tV7/i////,s(atiiij;' that in tc.niicdiat*; stall's hrtwcc.n itandtlic, nonnai 

 torm arc not rar«>. 'I'Im; AUxdros.s si)e('iiii<Mis do not show any siudi 

 intermediate gia<latioiis, tlioiigli both the presuined variety and the 

 (ype species were obtained Croiii the sanu; locality. Leaving;' out of 

 c(nisi(b'ration tlie jiossibiMty of an ai)[)ro\iiiiation of the arian^eineiit of 

 tli(5 tnberehis in Die two Conns, there are yet otlier chara(;ters whicdi, it 

 seems to me, are of siiriicieiit imjiortance to necessitate the separation of 

 the two Ibriiis as distin(;t sjK'cics. These may b(5 brielly siiuimed up as 

 follows: (1) The |)roportioii of the diameter to the heij'lit of the <-oliimii 

 in A. J'<isfi(/(ilt(. is considerably less than in .1. VcrriUii, the latter having- 

 consecpieiitly a much more lobust form than the former; (li) the l)ase in 

 A./aHtUjata is adherent, while in A. Verrillii it is deeply concave and 

 incloses a mass of mnd or sand whicli serves as an anchor; (.'>) tlie 

 relations of the- non^onophoric atid ft'oiio])horic jncHenteries differs in 

 the two forms; (I) the loii^itn<linaI musculature? of .1. Verrillii is weak, 

 whereas in A./uHtiyala it is strong' ami forms a weIl-develoi)e(l pennon. 



(i.iiiiH CHITONANTHUS, /;(ii. iir)v. 



Choiidra(;tininai in wlii(ih thecai)itulum is provided with lonjjitudinal 

 ridges; the sea pus, esjiecially in its upjier portion, with slroiig- pointed 

 tubercles not arranj^ed in any detinite order, or else v/ith a siniL;lo cin-le 

 of coronar tubercles; tlie <!uticle strongly developed upon Ww, tuber- 

 cles; tentacles without any bulbous enlargement at the base. 



1 suggest this genus for two forms already des(;ribe(l by Hertwig 

 ('Sli, '<S<S) as riicUUi pcA'tiudtd and I'hcllia .spiiiij'rra. There? can be no 

 doubt that it is advisable to remove them from the gcjiius i'/ielll((, the 

 typical members of which have a smooth capitulum. If the delinitions 

 which lladdon (^S!)) has jn-oposcd for .the vaiioiis genera of Chon- 

 (Iractinida? be accc|)t(Ml, Jlertwig's I*heUia sj)ini/'cra linds no i)lacc 

 among them. It comes close to (Uii(on<(eti.s, but diders in possessing 

 ridges upon the eaiiituliim. It is to be noticed that lladdon has as- 

 signed the forjii described by Hertwig ('8L*) as Phcllia pa-tin<da to the 

 genus llonndfliid ()\' (lossc;. If this be v.on'iH!,t, Pkelliu spini/cra um>^t 

 be refeired to the same genus whose definilion will reejuire to be 

 ainended so as to iiudude forms i)ossessing tui)er<'Ies scattered irregu- 

 larly over the scapus. ilowever, il" the ligiire given by (Josso ('GO) of 

 his JIoniKdhia marfjftritw Ik? correet, its ca])ituliim is smooth and it 

 wonld perhaps be as well, especially when we consider how little is 

 delinitely known regarding the type species of (lie genus, to reserve 

 UormaUiia for those forms in wlii<;h the (;apitiilum is smooth and which 

 possess only a coronal row of tubercles, associating the I'heUia pcctinata 

 of Hertwig and the Ilormathia andersoni of JIad<h)ii ('<S.S), which 



