280 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ]05 



pleurocyst as M. crozetensis but its orifice dift'ers. Waters (1899, 

 p. 9; 1904, p. 64) discusses the affinities and reason for the change of 

 name from Busk's original identification to the present species name. 



Genus Parasmittina Osburn, 1952 



Parasmittina, Osburn, 1952, pp. 392, 411-412.— Bassler, 1953, p. G208. 



Osburn erected this genus for those species of Smittina having an 

 areolated pleurocyst; well developed lyrula, cardelles, and peristome;! 

 perforated ovicell; and avicularium variously placed but never median,^ 

 suboral, or with central bilaterally symmetrical avicularial chamber.: 

 He designates the type species as Lepralia jeffreysi Norman 1876 

 (now Parasmittina). 



Parasmittina hymanae, new species 



Plate 21 



Diagnosis: Zoarium encrusting. Zooecial boundaries distinct. i 

 Convex frontal an areolate beaded pleurocyst. Avicularium broadly 

 oval or elliptical, always placed over a corner areolar pore. Some: 

 zoids without avicularia, others with one, two, or three. Mandibles 

 thumb-nail shaped, with broadly chitinized border. Ovicells non-i 

 porous, globose, but bordered by areolar pores. Peristome incomplete 

 distally in ovicelled zooecia but complete in nonovicelled zooecia. 

 Peristome raised, with flat frontal mucro bordered by a sinus on each; 

 side. Primary orifice hemispherical, with a medium-sized lyrula and 

 cardelles. Operculum approximately hemispherical, with reinforced 

 sides and edge. Compensation sac occupies most of the frontal area.j 



Parasmittina hymanae is named in honor of the distinguished zoolo-) 

 gist Dr. Libbie Hyman of the American Museum of Natural History.; 



Measurements: Minimum to maximum and average measure- 

 ments, in millimeters, are given below (for explanation see p. 271). 



Z-L, 0.835-1.224 (0.983) Ly-W, 0.050-0.058 (0.056, at tip) 



Z-W, 0.590-0.821 (0.716) Ly-W, 0.050-0.072 (0.069, at base) 



Av-L, 0.115-0.144 (0.123) Ov-L, 0.302-0.360 (0.358) 



Av-W, 0.072-0.101 (0.084) Ov-W, 0.346-0.418 (0.403) 



Pr-Or-L, 0.101-0.144 (0.119, four read- Op-L, 0.115-0.158 (0.138) 



ings) Op-W, 0.180-0.223 (0.206) 



Pr-Or-W, 0.144^0.202 (0.180, four read- M-L, 0.058-0.072 (0.061) 



ings) M-W, 0.055-0.072 (0.063) 



Se-Or-L, 0.130-0.173 (0.146) CS-L, 0.374-0.662 (0.497) 



Se-Or-W, 0.144-0.166 (0.154) CS-W, 0.288-.0533 (0.388) 



Ly-L, 0.014-0.029 (0.023) AP-D, 0.043-0.072 (0.059) 



