(ANTARCTIC BRYOZOA — ROGICK 285 



Affinities. Osburn (1952, p. 425) mentions two broad groups of 

 Rhamphostomella species. One group has a strongly ribbed frontal 

 wall, frontal avicularia, no cardelles, and a primary orifice which is 

 strongly arcuate, sometimes having a lyrula. The second group has 

 a plain, thinner frontal wall, without prominent costules, with frontal 

 avicularia wanting, and primary orifice with distinct lyrula and 

 cardelles. The Antarctic species R. bassleri is intermediate between 

 the two groups. It favors the second group but has frontal avicularia 

 and short costules. 



L Genus Smittina Norman, 1903 



"Smittia Hincks (preoccupied), 1879, p. 160; 1880, pp. 340-341.— Levinsen, 1902, 

 p. 26.— Waters, 1904, p. 61. 

 Smittina Norman, 1903, p. 120. — Levinsen, 1909, p. 339. — Canu and Bassler, 

 1920, p. 457 (genotype as LepraUa reticulata MacGillivray, 1842 (cf. 

 Smittoidea)) . — Lagaaij, 1952, p. 94. — Brown, 1952, pp. 319-320 (sets genotype 

 as LepraUa landshorovii Johnston 1847 and chooses neotype (cf. Smittoidea)) . — 

 Osburn, 1952, pp. 390-391 (splits genus into 3 genera, retaining S. lands- 

 horovii for Smittina proper). — Bassler, 1953, p. G209. 



The above synonj^^my refers to significant papers only. 



Remarks: Hincks (1880) stated: "The cardinal character of this 

 genus is the elevated secondary orifice, produced and channeled in 

 front. The dentate lower margin is common to it." This still holds. 

 i The genus, as newly restricted by Osburn, is characterized below. 



Diagnosis: Frontal a tremocyst, hyperstomial ovicell with pores; 

 lyrula, cardelles and peristome present; a symmetrically developed 

 median suboral avicularium included either within the peristomial 

 fold, spanning it, below it, or sometimes even fitting into a gap in the 

 peristome. 



The genotype is LepraUa landshorovii Johnston (1847, p. 310, pi. 

 54, fig. 9). 



Smittina abditavicularis, new species 



Plate 23 



Porella malouinensis Livingstone, 1928, pi. 6, fig. 7; pi. 7, fig. 2; text fig. 15, 

 pp. 66-68. 



Diagnosis: Zoarium encrusting. Zooecia elongated, boxlike. 

 Frontal a thick, nearly flat tremocyst. Secondary orifice clithridiate, 

 primary orifice smittinoid, with small lyrula and sizable cardelles; 

 a small oval oral avicularium obliquely placed inside between the two 

 orifices. Ovicell unknown. 



The species is named for its hidden avicularium, from the Latin 

 abditus" (liidden, secret, removed) and "avicula" (diminutive of 

 bird). 



350040—56 5 



