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THE VOYAGE OF H.M.S. CHALLENGER. 
species ; the only difference between them is the apparently smaller size of the anterior 
avicularium. Should the two turn out to be identical, Mr. Hincks’ name must, of course, 
be adopted. 
(8) Smittia stigmcitophora, n. sp. (PI. XXII. fig. 6). 
Character. — Zooecia completely immersed, flattened in front, irregularly quincuncial ; 
surface shining, with closely placed large circular punctures, which are larger round the 
border. Primary orifice arched, dentate ; secondary clithridiate with a small avicu- 
larium with spatulate mandible just within the lower lip, and in front of the hammer- 
shaped denticle. Ooecia inconspicuous, completely immersed ; surface granular and pre- 
senting a crescentic or reniform, punctured stigma in front. 
Habitat. — Station 315, lat. 51° 40' S., long. 57° 50' W., 12 fathoms, sand and 
gravel (on shells). 
In some respects resembling Lepralia {Smittia) cheilostoma, Manzoni, as well as 
Lepralia {Smittia) bella, Busk, it differs from the former in having an avicularium within 
the lower border of the orifice ; in the deeply immersed ocecium with its peculiar stigma, 
resembling that in many Australian Retepores, as well as in the absence of a raised 
septum, or even of a sulcus between the zooecia. It has a dull purplish colour, and is 
very closely attached to the shell upon which it is growing, and the posterior wall of 
the zooecia in a small detached fragment is deficient. 
(9) Smittia graciosa (PI. XXII. fig. 13). 
1 Porella concinna, var. /3. gracilis, Hincks, loc. cit., p. 324, pi. xlvi. fig. 9. 
Character. — Zooecia elongate, oval, attenuated and somewhat raised towards the orifice. 
Secondary orifice clithridiate, enclosing within the lower border a small circular avicu- 
larium with a spatulate mandible, and behind this an internal denticle. Peristome thin, 
two oral spines above but only in the youngest cells. Surface punctured, the punctures 
rather distant and uniformly distributed. 
Habitat. — Station 148, lat. 46° 47' S., long. 51° 37' E., 210 fathoms, hard ground, 
gravel and shells. 
This form appears to bear a strong resemblance to that described by Mr. Hincks. 
It differs, however, to judge from his figure, in the form of the zooecia, which in 
Mr. Hincks’ species are apparently longer and slenderer and separated by raised septa, 
which are entirely wanting in the present form. Notwithstanding this, it is by no 
means clear that the two are not identical ; if so, I should nevertheless be inclined to 
refer neither to Porella concinna , an essential character of which, as indeed is pointed 
out by Mr. Hincks, is the presence of a row of marginal pores, of which there is no 
trace either in Porella concinna ft, or in the present form. 
