132 



IIKPORT — 1884. 



-I 



Group T. RAPlcr.M.ATA, D'Orbifrny, Smitt. 

 ArticuJtild .s'. raiUuta, Bnsk, 'Crag Polyzoa.' 

 ' Zonrinm erect, articulatud, attacliod by radicai tubes.' 



Family f. Ci.'Isiid.k, .lolinston. 



' Zoariuin dendroid, calcareous, composed of segments, united by 

 corneous joints. Zouccia tubular, disposed in one or two sei'ies.' — llineks, 

 p. 117. 



Genus UxiciasiA, D'Orb. 



Type Unicrliilii vi'nJohoiienxin, D'Orb. 



lam not familiar, otluirwise than by ligure, willi D'Orbigiiy's species, 

 but the form described and tigured by Iteuss in liis ' V'al di Lonti 

 Mryozoa,' is jjresent also in the Bryo/oa material from Montecchio 

 Maggiore, Xorth Italy, though not given in the lists of the autlior. 

 The r.oarlum is uniserial, but unlike any otiier uniserial Cri>^ui k?io\vn to 

 rae. The r.iKrrJa are borne upon a kiiid of stoh)n, out of which tlie cells 

 are devfloped, and these are pyriform ; the proximal part of tlie cell 

 contracting and tlie distal pi'otrudiug from the stohjn. 



1. U.NicinstA TKN'KUKiMA, lleuss =? {/"///(•;•/.•>■»( vindiihonennln, D'Orb., 

 ' Pahvontol. Tcr. Cret.' = Cri^la vinduhonensis, lieuss, ' I'oss. Pol, 

 d. Wien. Tert.' 



Itaugc. — Miocene, Val di Lonti ; Montecchio Maggiore, X. Italy. 



Genus Crtsia, (part) Lamouroux. 



' Zoojcla in a single eeries, or in two alternate series.' — Ilincks, p. IIS. 



I have no knowledge of Fossil Gri>^ia of the type Crlsia corvula, Linn. 

 The only unicellular form known to me is the one already described, and 

 this is so unlike any Grlsia known to occur in a recent state, that 1 jilace 

 it in the group out of deference to Rcnss and D'Orbignj-, and because the 

 fragments are too small to allow of proper location in this or in any other 

 group. Tlie following, however, are true CrLsiic but 1 am not certain 

 that all the identifications of authors are correct. Anyone who has 

 studied this efenus in larsre masses must hv convinced that the characters 

 upon which species are founded vary considerably. Those characters are, 

 for the most part, the number of cells to eaeli iiiternode and the positions 

 from which tlie branches arise. Thus we iindthat C. ebnnicaJ C. Jeidicn- 

 lata, C. acropora, G. clurneo-denticulata, and G. margaritacea have, so far 

 as features ai'O concerned, a common likeness. In G. e!o)igafi( and ('. 

 sinchtroisis we have another special feature, especially so in the crowded 

 state of the minute foramina of the cells. In G. Jistidosd, G. tuhuloxa, and 

 G. JloldsmortJiii, we have dill'erent characters again ; while in G. I'hJ- 

 id G. cniiferta we have two additional types of ::(iii:ci'n, and also 

 a fossil state, it would be diflicult indeed to distinguisl' 

 specific characters in the first grou]), but not so diiiicult with the other 

 groups. In the following list, then, so far as 1 have a personal knowledge 

 of the forms, I will distinguish the first as Group «. The others are 

 suflicieiitly characteristic to allow of proper identification in the fossil 

 state. 



' iScc BjU. Mils, (.'afiihiijui', pt. iii. ; ' Marine rolyzoa,' Dusk, and ilatcs. 



\vard>^inna ant 



zoarnuH. 



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.A 111 

 vol! 



