734 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



MECYNOECIA LOBATA, new species. 

 Plate 157, figs. 1, 2. 



Description. The zoarium is a Proboscina, creeping on shells; it is formed 

 of pluricellular branches, bifurcated, and irregularly lobed. The tubes are in- 

 distinct and very short; the peristomes are thin, very near one another and ar- 

 ranged in quincunx. The ovicell is small, little salient, little elongate; the 

 oeciostome is as large as a tube, transverse, placed on the peristomie of a tube. 



f Distance between the peristomes- _ _ 0.14-0.16 mm. 



Measurements. \ .. , . 



I separation or the peristomes 0.40 mm. 



Occuwence. Vicksburgian (Marianna limestone) : Near Claiborne, Monroe 

 County, Alabama (rare). 



Holotype.G&t. No. 65397 U.g.N.M. 



MECYNOECIA GLOBULA, new species. 



Plate 157, figs. 3, 4. 



Description. The zoarium incrusts bryozoa; it is a Proboscina with club- 

 shaped branches. The tubes are short, little distinct, somewhat striated trans- 

 versally, bent upward at their extremity and terminated by a short peristomie 

 elevated vertically; the peristome is thin and orbicular. The ovicell is little 

 elongate, globular, smooth, symmetrical; the oeciostome is elliptical, transverse, 

 as wide as the tube by which it is supported. 



Diameter of the peristome 0.10 mm. 



Measuremen ts. 



Distance between the peristomes 0.40 mm. 



Separation of the peristomes 0.46-0.50 mm. 



Occurrence. Vicksburginn (Marianna limestone) : One mile north of Monroe- 

 ville. Alabama (rare). 



Cotypes.Cat. No. 65398, U.S.N.M. 



Forma ENTALOPHORA Lamouroux, 1821. 



We introduce in this zoarial genus or forma the species with the tubes open- 

 ing on all sides of the cylindrical branches, but in which no ovicells have been 

 discovered. Most of the species hitherto referred to Entalophora, have the elon- 

 gated ovicell of Mecynoecia. 



ENTALOPHORA ST1PATA, new species. 



Plate 108, fig. 16. 



Description. The zoarium is cylindrical, club-shaped ; the tubes are indis- 

 tinct, arranged in regular quincunx and transversal verticells; the peristomes 

 are quite close, thin, little salient, orbicular. 



Diameter of the peristome 0.12 mm. 



Measurements. 



Distance between the peristomes 0.30-0.36 mm. 



Diameter of the branches 1.00 mm. 



The figured specimen only has been found, but it is quite characteristic. 



