124 Rev. T. Hincks’s Contributions towards 
Mucrone.ua, Hincks. 
Mucronella porosa, n. sp. 
(Pl. I. fig. 5.) 
Zoecia elongate and rather narrow, or of a shorter and 
more ovate form, moderately convex, rising towards the 
orifice, depressed towards the base; orifice ample, suborbicular, 
somewhat flattened below, with a broad tooth inside the 
inferior margin, and a sharp denticle on each side; imme- 
diately below the tooth a large massive mucro, swollen at the 
base, bearing on one side an aviculariwm with rounded man- 
dible directed upwards; a small aviculariwm (also rounded) 
on the margin at one side of the mucro ; walls of cell strongly 
calcified; surface thickly covered with rather large deep 
pores, in older states reticulate. Occium large, rounded, of 
considerable width, thickly and minutely granulated or reti- 
culate, slightly flattened in front, white and silvery. 
Loc. Off Curtis Island. [Singapore or the Philippines, 
on coral (Miss Jelly).| 
Mucronella teres, n. sp. 
(Pl. I. fig. 5.) 
Zoecia ovate, quincuncially arranged, convex, divided by 
deep sutures, in which an inconspicuous line is traceable, 
punctured round the edge, the cell-wall rising towards the 
orifice, which is borne on a short neck; surface perfectly 
smooth, whitish ; orifice suborbicular, a tooth inside the lower 
margin ; the peristome carried up into a small central mucro 
in front, on the inner side of which is a slight nodular pro- 
jection; six spinesround the upper margin. Owciwm globose, 
smooth, somewhat recumbent, two spines showing on each side 
in front of it. 
Loc. Off Curtis Island, on shells. 
Allied to the British JZ. ventricosa and a characteristic 
example of the simpler type of structure for which this genus 
was originally founded. It is a question whether the Mucro- 
nella group might not properly be divided; but any revision 
should be based on a more extended study of foreign species 
than has yet been made. 
Mucronella spinosissima, n. sp. 
(ele aQUL; ieee, 74.) 
Zoecia small, lageniform, the peristome elevated, suberect, 
forming a neck; surface perfectly smooth, subhyaline, a row 
of punctures round the edge; orifice suborbicular, a broad 
