vine: YORKSHIRE CARBONIFEROUS AND PERMIAN POLYZOA. 187 
Zoaria, composed of small, cylindrical, bifurcating stems. 
Zocecia, arranged ni linear series, the vestibules of which are 
separated from each other by reticulated interspaces. 
In 1885 I proposed the above family name for the inclusion of 
two peculiar species of Carboniferoiis Polyzoa, Hyphasmopora Baskii, 
Eth. Jun. and Streblotrypa nicklisii, Ul. M.S., var. minuta, Vine. The 
first of these species was described by R. Etheredge, jun., in 1875,t 
and tlie variety of Strehlotrypa was new to British Carboniferous rocks. 
Since my papers were written Mr. E. 0. Ulrich has published details 
of several 'American species of Polyzoa allied to Hyphasmopora, but 
which are placed under a new family name, Streblotrypid.e. In his 
paper on the " Waverly Bryozoa,"J Mr. Ulrich says (op. cit. p. 84) 
"The genus Streblotrypa was proposed in manuscript by me several 
years ago, and specimens of the type species, >S'. nicklisii, Ul. 
(III. Geol. Survey, vol. VIII.) were sent to Students of Pala30zoic 
Bryozoa. The name was adopted for a supposed variety of the type 
species by Mr. G. R. Vine in 1886. || During November or December, 
1887, there appeared Vol. VI. of the Palaeontology of New York. 
In looking over this fine work, I find that Prof. Hall has placed at 
least one species under his new genus, Acanthodema, that ought 
rather to be regarded as a form of Streblotrypa , The species referred 
to is the Ceriopora hamiltonensis of Nicholson." 
In referring to the description of this species by the author, I 
find that Nicholson places it as follows : § Ceriopora t hafniltonensis, 
Nich.," and remarks that " this beautiful little fossil occurs in great 
abundance in some of the beds of the Hamilton formation. It is 
allied to Ceriopora punctata, Goldf.1[ and to Millepora interporosa, 
Phill."* especially to the former; but it is distinguished from both by 
perfectly good and easily recognised characters. I am at present un- 
able to decide as to its true generic affinities, and have simply referred 
* Part I. Pioc. Yorks. Geol. and Pulytec. Soc. vol xi., pi. 1, pp. 68-85. 
t Ann. Mag. Nat. Hist., Ser. 4, vol. xv. 
X Bulletin of the Laboratories of Denison University, Granville, Dec, 1888. 
II Notes on Yoredale Polyzoa, Proc. York. Geol. Soc, &;c, vol. ix. (op. cit). 
§ New Devonian Polyzoa Geol, Mag-., 1874, p. 24. 
4 Petrifac, pi. Ixiv., f. 13. 
** Geol. Yorks., vol. ii. pi. i , f. 36-39. 
