282 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



Genus Rhamphostomella von Lorenz, 1886 



Rhamphostomella von Lorenz, 1886, p. 11. — Hincks, 1889, pp. 424-426. — Canu 

 and Bassler, 1920, pp. 476-477.— Lagaaij, 1952, p. 102.— Osburn, 1952, pp.]- 

 424-425.— Bassler, 1953, p. G208. l 



Remarks: Hincks quotes fully von Lorenz's original diagnosis of 

 the genus and adds tbe following: "Zooecia oval, the walls thin, of 

 delicate shining material, smooth (frequently traversed by radiating 

 costae) entire (destitute of pores) ; orifice ample, arched above, lower 

 margin straight or slightly curved, within it a median denticle, below 

 it or upon it an aviculiferous rostrum. Ooecium semicircular or. 

 subcrescentic, perforated . ' ' 



Canu and Bassler add that there is a lyrula and a pleurocyst and 

 that the hypers tomial ovicell is closed by the operculum. 



Lagaaij states that previous workers, as Waters, noted areolar pores' 

 which were not a feature of the original generic characterizations, thusj 

 necessitating a modification of Hincks' and Lorenz's diagnoses.; 

 Another necessary modification is that the ovicell sometimes is imper-i 

 forate (as in the R. ovata (Smitt) of Osburn). RhamphostomelM 

 bassleri, new species, has a single small frontal pit on the oviceU 

 ectooecium, which in advanced calcification is calcined (i. e., the pit),; 

 and the ovicell is outlmed by some areolar pores which do not penetrate 

 the ovicell proper. Eliamphostomella costata von Lorenz 1886 is thei 

 genotype (Canu and Bassler, 1920, p. 477). 



Rhamphostomella bassleri, new species 



Plate 22 



Diagnosis: Zoarium encrusting to foliaceous, unilaminate. Zooeciai' 

 suddenly convex. Distal walls a modified inverted V. Mural rimd 

 thin, not salient. Frontal areolated. Areolae numerous, mediumi' 

 sized, close together and almost tubular on one side because frontal 

 rises upward so fast. Interareolar costae short. Primary orifice 

 smittinoid, with cardelles and a low broad tyrula. Operculum hemi- 

 spherical. Secondary orifice lepralioid to faintly trifoliate, obscured 

 by a large, cone-shaped aviculiferous mucro. Pointed avicularium on 

 one side of the mucro. One or two other smaller mucronate avicularia 

 often present in various positions on frontal. Mandible triangular, 

 with hooked tip. Two frontal pores present below and to the back 

 side of the oral avicularial chamber. Ovicells globose, nonporous, 

 tipped forward partly over the orifice. 



Rhamphostomella bassleri is named in honor of Dr. R. S. Bassler of 

 the Smithsonian Institution, to whom bryozoologists owe an immense 

 debt of gratitude. 



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