328 Rey. T. Hincks’s Contributions towards a 
minute particulars *, but it differs essentially from M. Peachit, 
var. octodentata. From the latter it is distinguished by its 
lageniform cells, the tall, neck-like, tubular peristome, which 
is more than suberect, sometimes standing up almost at right 
angles to the cell-wall, the rim bearing at the back and round 
the sides about eight rather short spines set closely together, 
the front margin carried up into a somewhat broad mucro, 
often bi- or tridentate, and by its recumbent ocecium. It is 
also furnished with an oral denticle, but it differs in form and 
position from that of the variety octodentata. ‘The cells of 
M. spinosissima are very ventricose below, the surface is 
smooth and shining, and a line of small circular pores runs 
round the margin. I have no doubt of its distinctness from 
the British form. 
In my “ Report on the Polyzoa of the Queen Charlotte 
Islands ” I have described a supposed variety of the present 
species under the name JV. spinosissima, form major f. 
Further consideration has convinced me that the supposed 
variety is really a distinct species, with some marked charac- 
teristics, of which the tubular structure in the cell-wall is 
probably the most important. I propose to name it Mucro- 
nella perforata. 
Miss Jelly also ranks Lepralia multispinata, Busk, as a 
synonym of the variety octodentata {. Upon this I can only 
remark that the general character and the details of structure 
seem to me strikingly dissimilar in the two forms. This must 
be apparent, I think, on a comparison of Mr. Busk’s figure 
with my own. I may direct attention specially to the enlarged 
figure of the orifice of L. multispinata §, which represents a 
totally different structure from that which is characteristic of 
MM. spinosissima. 
In his ‘Challenger’ Report (part 1, p. 160) Busk has 
described a variety of Mucronella ventricosa, which he has 
named multispinata and which he was inclined to think 
might be identical with my J/. Peachii, var. octodentata. 
His form, he contends, must be referred to J/. ventricosa 
rather than to JZ. Peachii, and judging from the detailed 
account which he has given of it there can be little doubt 
that he is right. On the other hand, some of the most 
* It is furnished, like the fossil species, with the broad, flat, oral den- 
ticle, directed downwards and overhanging a large portion of the orifice, 
mentioned by Waters. It may be added that the upper margin of the 
primary orifice is distinctly crenulate. 
+ “Report Pol. Q. C. L.” p. 27 (sep.), pl. iii. fig. 3. 
{ ‘Synonymic Catalogue,’ p. 195. 
; een Journ. Micr. Sci., ‘‘Zoophytology,” n.s. i. p. 78, pl. xxxii. 
g. 0. 
