140 



KEPOUT — 1884. 



m 



H 



])ro(luco(l cells arc tubular, occasionally passing off into the Lcpralia- 

 iilvo form of a cell. The general features are tliat of Idnioncd, but the 

 cell chiiriictcrs are abnormal, and one would incline to place the one form 

 in two dilTerent genera. The same feature is noticeable in some of the 

 cells of Tircl»'lhin'a. Mr. Ihisk, in remarking on 1. ffucs/rdla ('Crag 

 Poly.' p. l('o), says that his species approaches 'in some respects the 1. 

 In'(iaetra, Lamx., as well as a recent species met with in South Africa, 

 which, if not identical with the Caen fossil, is unilistinguishablo from it.' 

 The form referred to by Bu.sk is before me, and there is cortjiinly a hke- 

 noss between the Jurassic iind the Uecent form, but the lieccnt form has 

 the adviintage of being more highly specialised and also larger in both 

 the colls and in the size of the zoariuni. ^Ir. Busk, howcA'cr, says that 

 the brandies of I. tii<ia<tra are very much thicker than the Uecent form. 

 This dilference of opinion nuiy arise from difference in size of fragments, 

 but anyhow I Ciinnot regard the ./. fi'iivstrafa, Busk, or the /. fciu'strata 

 (Busk), Smitt, ' Scand. Biyozoa,' as being one and the same species. This 

 being tiie earliest record that I have of Lhnoin'a, I think it would bo 

 unwise not to keep the species separate. It will be well, however, if 

 students will direct their attention to the several features referred to. 



Goldfiiss, in his ' Petrcfacta,' describes and figni'es what he gives as 

 tivo species of lielcpura — 1\. cauct'llittn, C; It. rhtUirafa, G., and K. 

 /ic/tf)iin\les, G.; li. tninciifa and li. disiicha — all from the Chalk. It is 

 very evident tliat Goldt'iiss neglected to sort out his species, and the 

 consequence is that we have an assemblage of forms anything but satis- 

 factory ; consecpiently the labour of Hagenow on the group is all the 

 more apprecial)Ie, because he worked from fresh material, and, from 

 what L understand from his text, with full ..l'ccss to the type species of 

 Goldf'\ss. I also have been able to stiulj the Faxoe Linu'stone material, 

 already referred to; and if I oll'er any remarks upon the species of 

 Hagenow, it must be understood that I do so with specimens before me 

 which seem to be the same or of near the same horizon as those oi" 

 JIagenow's ^laestricht beds. To prevent a repetition of Hagenow's and 

 GoldCuss's works, I shall give the reference to the plate and lig. only of 

 the two authors. 



2(;. Ii)Mu.Ni:.\ MACLT.ATA, Hag., H. Tab. II., fig. 3. 



InMoNKA ('i,atiii;ata, Goldfuss (Ri'teihira), n. Tab. II. tig. "2; 



(!old., ' Pet.' Tab. IX. Hgs. V2 c and d. 

 Ih.MONEA vi:i{Kicri;Ai'A, Goldfuss (]\cl<'j)ora), II. Tab. H. tig. 5; 



Gold., 'Pet.' Tab. XXXVI. lig. H> h. 

 Iiimo:,-i;a LiciiKNOinKs, Goldfuss (Reteiwra), II. Tab. II. tig. ti ; 



Gold., 'Pet.' Tab. XXXVI, lig. 13 a and h. 

 Id.monka rANCioiJ.ATA, Goldfuss (h'clqiura), II. Tab. II. lig. 7 = 



Idmonra ibid., Rss. 

 Tdmonka MAiir.iiNTA, lln-r. (Tii'tep(ira)^ II. Tab. II. tig. 4. 

 al. Idmomoa :>isru'iiA, Goldf. {lii'tejtoni), II. Tab. IJ. tig. 8 ; (Joldf., 

 'Pet.' Tab. IX. tigs, lo <•, d =^ Ji'etcpora ibid., Goldf., Lamx., 

 Blainv. = ? Rctcjmra, ^lichelin, ll(!uss. 

 'So. InMONEA I'SELDO-DisTU'irA, Hag., H. Tab. II. fig. 0; Gold. 'Pet.' 



Tab. IX. fig. 15 n-b = R. disticlia, G., in ])art. 

 Si. Idmonka doi.-sata, Hag., II. Tab. II. tig. 10 ; Goldf., 'Pet.' Tab. IX. 



figs. 15 (f & 11 = Ixeii'pava iiisllr.ha, G., in part. 

 3."). Idmonka gi:o.mi;tijica, Hag., II. Tab. II. fig. 11 



27 



')>; 



2'.). 



3U 



31, 



'ii]. Id.MONEA SL'LCAl-A, 



12. 



