302 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



Smittinella rubrilingulata, new species 



Plate 30 



Diagnosis: Zoarium small, rose colored, encrusting. Zooecia con- 

 vex, hexagonal, their frontal surfaces a beaded tremocyst with mar- 

 ginal pores somewhat larger than the other frontal pores. Depressed 

 mural rims. A small, pointed, deeply colored process in peristomie, 

 between the lyrula and external peristomial notch. Primary orifice 

 deeply set, with a larger elliptical anter and a narrower, shallow poster. 

 A medium-sized lyrula is bordered on each side by a very narrow 

 sinus. Lyrula hidden from view by the median triangular process. 

 Secondary orifice clithridiate. Peristome thin, elevated, collarlike, 

 interrupted frontally by a prominent notch. Two parallel lateral 

 peristomial ledges form a downward slanting channel between the 

 secondary orifice and the lyrula. Ovicell beaded, globose, salient, 

 with a single membrane-covered pore a bit above the frontal edge. 

 No avicularia found. 



The name of this species is derived from the Latin "rubra" (red) 

 and "lingula" (diminutive of tongue), because of the deeper coloring 

 about the triangular oral process. 



Measurements: Minimum to maximum and average measurements, 

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



Z-L, 0.648-0.950 (0.824) Ov-L, 0.288 (One reading) 



Z-W, 0.562-0.706 (0.629) Ov-W, 0.360 (One reading) 



Se-Or-L, 0.130-0.158 (0.143) Op-L, 0.115-0.144 (0.129 mm.) 



Se-Or-W, 0.133-0.202 (0.158) Op-W, 0.166-0.180 (0.174 mm.) 



CS-L, 0.432-0.493 (Four readings) Ly-L, 0.014-0.036 (0.026 mm.) 



CS-W, 0.518-0.533 (Three readings) Ly-W, 0.036-0.065 (0.047 mm.) 



Zoarium: Only small colonies consisting of few zoids were found 

 encrusting a large rock from Station 184. Colonies are lavender or 

 rose colored and so similar in general appearance to those of young 

 Smittina ordinata (MacGillivray) that it is easy to confuse them. 

 They look lavender on the rock but rose colored when viewed by 

 transmitted light on prepared slides. Polypide remains occur in some 

 zooecia. 



Zooecia: Distinct, hexagonal, and not heavily calcified. The most 

 intensely colored part of a zooecium is the triangular-pointed process 

 just back of the peristomial notch. This concentration of intense 

 color is an easy and sure way of distinguishing between Smittina 

 ordinata and Smittinella rubrilingulata, but specunens must be re- 

 moved to slides for this criterion to be used. 



The zooecial frontal is a very convex, beaded tremocyst with the 

 marginal pores a bit larger than the other numerous, uniformly small, 

 rounded, well spaced frontal pores. The frontal wall slopes up to the 



