ox FOSSIL rOLYZOA. 



139 



ill tako 

 CL'Us in 

 I sUall 

 to mo. 

 jfies i'or 

 'rreni;es 

 access 



oniatfi ; 

 Polyzoa.' 

 iiie, four, 

 f hroTicU 

 )Uuctato ' 

 mode of 



arranjrcmcnt, triangular brancljcs, and entire peristome ai'e good features 

 in tins species. 



The abandaneo of specimens of tbis species in the Ciarvel Park 

 deposits have enabled mo to study tlie form in all its varying features. 

 It is a peculiarly Northern ty])e, Avhereas the Lhuonca nuliinif', Lamarck, 

 its nearest ally, is as peculiarly Southern, 'i'he Fossil specimens from iho 

 Carvel I'aik beds are, I have no doubt, closely related to, if not identical 

 ■with, the J. rudians of JJeneden; and besides this, Mr. jjusk and ]\lr. 

 Hincks give as synonyms, thoutrh doubti'uliy, /. cnroiwpi^, JJef., and 

 I. anijiintdtd, l)'()rb.,as well. .Mr. Waters (' liay of Xaples IJryozoa,' (7;. ril. 

 p. tiO*J) remarks of the /. (jrurlUimd of lleuss, * tiiat specimens in his 

 possession, from Val di Lonti, correspond with recent /. atlnnilini. 



It is very jjossible that if tlie various specimens of tliis beautiful 

 species were isolated, or found in dilferent localities even of the same ago 

 as the Glacial deposits, they may be characterised as dilferent species, 

 but minglii'g will: such abundance in these beds, all the gradations of 

 variations may be t.'accd, and it seems to me impossii)lo tose])arate them. 

 With regard to the J. f/racillinia of Jleu.ss from the Miocene beds of Val 

 di Lonti, and also from the iMontecchio .^b^ggiore beds of Nortliern Italy, 

 although specimens resemble, in some cases closely so, recent Ithinniea 

 atlaniica, 1 shouLt rather hesitate to ])nt the one as a synonym of the 

 other. It nir.y bo possible to establish a connection between the 

 /. f/raciUiiiia, ileuss (non IJusk, ' Cyclostomata,' p. II), and some of the 

 still undescribod Cretaceous species, and it may also be possible to show 

 gradations of typo from J. gnu-iUinia to I. atlaiifica. 



21-. Iii.MONK.v scRi'KXs, Liuna^us = Tiih!]>orn ibid., Linn., ' Syst. ISTat.' 

 ed. 12, 1271. Tii.hiiltporn ibid., Flem., Couch, Johnst., .I>usk. 

 Tdmonea scypGuti, Van. l]en., Smitt (su'o-genus), Jlineks. (See 

 for references, y>- l-^S, 'Brit. Mar. Polyzoa,' vul. i. I8S0.) 



This species, as a fossil, has a far more limited range than the above. 

 I have specimens in tlie young state from the Glacial Beds of Scotland. 

 A specimen, figured by ilan/.oni (' Bi-yozoa of Castrocaro,' p. lo, fig. 78, 

 tuv. vi.), Mr. Ilineks accepts, on the auth(jrity- — Pliocene, Castrocaro 

 (Manzoni) ; Sicilian Pliocene (Waters). \\\ his synonyms, ]\lr. Hincks 

 also refers to this species — Ttihidipora tnnt.tvcri'a, Lands. , and Idniflvcii 

 ibid., ]\lilne-l']dw. and D'Orb. In my own investigations 1 have not been 

 able to place Idniouca s''rjH-'i"^ — ^JV^ accepted by Hincks, ^lan/.oni, and 

 Waters — below the Pliocene beds. 



For fuller particulars, see Husk, ' Cyclostomata, l>r!t. IMus. Cat.' pi. 

 iii.pp. 2ij--2C,; und Hincks, 'Brit. Mnv. Poly.' (A/c. cif. {). 4.");V). 



25. IdmiiNI'a TKIQIKTI.'A, Lauix. (author's) (' Jura foi'mntion,' Kanville). 

 Brit, locality, Juras. rocks under J^ondon — Professor Judd's 

 material. 



Though not abundant, I have a few specimens of this species froni 

 the maiorial referred to by Professor Judd. Th species is evidently 

 founded upon its peculiar triangular character r ,nei' than any special 

 features in the cells. After a careful study of the British s])ecimens, the 

 following results have been obtained, which I give rather as a description 

 than as a diagnosis. I. Zoariuvi triangular, rjiccia arranLicd in lines — 

 sometimes flattened, some lines slightly produced ; the flattened cells are 

 'Lepralia 'like, with a senucircular orilice, with the area jjunctured ; the 



