125 



" Polyzoary adnate, attached parasitically to the exterior of corals, branching in an ir: 

 "ularly dichotomous manner. Cells in reality unisonal, but so di-posed by the turning ot 

 each cell-mouth to alternate sides as to look as if bi-serial. The terminal portion of each cell 

 bent outwards ; the aperture circular. The cells tubular, elongated, -lightly or not at all 

 expanded and not at all elevated towards their apertures. Five eel's in the space of two lint - 

 width of cell about one-fiftieth of an inch near the mouth. 



" I have considerable doubts as to tin- affinities of this extraordinary little tii-sil ; but 1 

 think it is certainly one of the Cyclostoinatous 1'olyzoa, and 1 >ee at promt nn bt.-tti.-r c>u: 

 than to refer it to .-//,' . Lamoroux. When nut examined closely, tin- fi-il : TikiiiL' 



resemblance to a Scrtularian Zoophyte, exhibiting exactly the appearance ot a number ot 

 tubular calycles or cells springing alternately from the two sides of a common canal or stem. 

 When minutely looked into, however, it is seen that this is deceptive, ami that the io.-.-ii con 

 sists really of an alternate or sub-alternate series of long, tubular, .-li htly flexuous ccllu 

 each cell being nearly cylindrical, and having the terminal portion geniculated or bent out 

 wards, in such a manner that the mouth> ot so cells point in opposite directions. 



" The difficulty in determining the systematic place of this fossil is much increased by 

 the fact that it occurs solely in the forms of easts, ramifying in the walls of moulds from 

 which corals have been removfd. It is, therefore, impossible to determine what was the u-\- 

 ture of the co3noecium, whether calcareous or corneous; whilst the lines of division between tin- 

 cells, where they come in contact with one another, are only very faintly and obscurely indi- 

 cated. The form of the aperture of the cell appears to have been circular, and it- p-ition 

 terminal ; but some uncertainty attaches to both of these statements." 



Since writing the above, I have obtained specimens of the same fossil from the II ami: 

 L r roup, in which the actual corallum itself is preserved, and these seem to i-how that the spec 

 is truly referrible to Aulp<-i-<i, though certainly unlike the typical species of the genus. 



Kn. 57. 



"); n. A fnurriu-nt natural ri; ' f.-wt fr..in U 



MTnffement obt Cut from the Coroll ..inwln.iia i>;r'.ii n , >t.um 



</. A portion of tin- - timi oonl, tlroin tb* HunUton group, mlurged; (.All M -t 1 " furtii- 



The ex imple- from tin- Hamilton .jroup have the form of hr.m-hiiiL' calcareoii-. 

 whicli are adherent by the whole of one -urlare tn -..m,- IMP i.-n b->'lv I h-- tub. 

 evlindrical or -uf. evlindric-il. mnrki-il with extremely tine encirdin/ <tri:r. ami Invin 

 ili:.me,. r of nbont orn- fiftieth of an inch. The l.-.tenl tnbe< are pn-l ..... ! Ir-.m tl e 

 main tulie. n-uallv alteninti-ly on oppo-ii,- -],],>. :,n.l -. -nerallv at intervaU of I- 

 a line to half a line. Their len-tli varie- fr..m half a lin-- t-. :. line ,|,,1 .. h ,!f. MP! il 

 tioii may \<<- nearly parallel with the m tin tube, or at ri-ht it, but ^'eiierallv form 



.HI. (, nt |H to 50 The aperture- of the lateral tub---, are not ,-l,\:it..l kbov ' 



ial Mirfaee, nrnl ii'-nal'v Inve an elli|>tie-il I'Mrni 



I .!.. IKit Vet (',,] -ilti-lie.l thlit thi- -ill.'lllar t. 'Ill I ' 'II' 1 Wei 



. <1 -peeimiii- from tin- Hamilton L'ronp M- in- I" provt- it n<>t to ! .in t \ n 



