132 rei>okt— 1884. 



Group I. Kadicellata, D'Orbigny, Smitt. 

 Articulata s. radiata, Bask, ' Crag Polyzoa.' 

 ' Zoarium erect, articulated, attached by radical tubes.' 



Family I. CbisiIM, Johnston. 



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

 corneous joints. Zooicia tubular, disposed in one or two series.'— Hincks, 



p. 417. 



Genus Unicrisia, D'Orb. 



Type Unicrisia viadobonensis, D'Orb. 



lam not familiar, otherwise than by figure, with D"Orbigny's species, 

 but the form described and figured by Reuss in his ' Val di Lonti 

 Bryozoa,' is present also in the Bryozoa material from Montecchio 

 Maggiore, North Italy, though not given iu the lists of the author. 

 The zoarium is uniserial, but unlike any other uniserial Crisia known to 

 me. The zooscia are borne upon a kind of stolon, out of which the cells 

 are developed, and these are pyriform ; the proximal part of the cell 

 contracting and the distal protruding from the stolon. 



1. UxiCRiSfA tenerrima, Reuss = ? Unicrisia vindolonetisis, D'Orb., 

 ' Palaaontol. Ter. Cret.' = Crista vindobonensis, Reuss, ' Foss. Pol. 

 d. WieD. Tert.' 



llange. — Miocene, Val di Lonti ; Montecchio Maggiore, K Italy. 



Genus Crisia, (part) Lamouroux. 



' Zoo:-cia iu a single series, or in two alternate series.' — Hincks, p. 418. 



I have no knowledge of Fossil Crisia of the type Crisia cornnia, Linn. 

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

 this is .so unlike any Crisia known to occur in a recent state, that. I place 

 • it in the group out of deference to Reuss and D'Orbigny, and because the 

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

 group. The following, however, are true Crisice but I am not certain 

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

 studied this genus in large masses must be convinced that the characters 

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

 for the most part, the number of cells to each iuternode and the positions 

 from which the branches arise. Thus we find that C. eburaea, 1 C. denticu- 

 lata, C. acropora, C. eburneo-denticulata, and C. margaritacca have, so far 

 as features are concerned, a common likeness. In C. elongata and C. 

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

 state of the minute foramina of the cells. In C.fistidosa, C. tubulosa, and 

 C. Holdsivorthii, we have different characters again ; while in C. Ed- 

 ivardsiana and C. eonferta we have two additional types of zooccia and also 

 zoarium. In a fossi'l state, it would be difficult indeed to distinguish 

 specific characters in the first group, but not so difficult with the other 

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

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

 sufficiently characteristic to allow of proper identification in the fossil 

 state. 



1 See Brit. Mus. Catalogue, pt. iii. ; ' Marine Tolyzoa,' Busk, and rlates. 



