ART. 14 FOSSIL AND KECENT BRYOZOA CANU AND BASSLER 115 



The ovicell develops between the olocyst and the pleurocyst of the 

 distal zooecium and shows all the characters of the frontal. This 

 characteristic as well as the absence of an avicularium in the sinus of 

 the peristomie would cause us to place this species in the genus Mu- 

 cronella, although this change would still not satisfy scientific exact- 

 ness. Smitiina trispinosa is a very cosmopolitan species which pos- 

 sesses powerful means of adaptation, a knowledge of which will 

 reveal its very instructive biology. In our Philippine monograph we 

 have tried to begin this work by putting some order in all the known 

 varieties. In spite of the contrary opinion of Smitt, the variety 

 spatliulata is special to the Gulf of Mexico. The variety spathulata 

 of MacGillivray and Kirkpatrick from Torres Strait differs notably 

 in the position and form of the large avicularia. 

 Occurrence (var. spatliulata only). — 



Fowey Light, 15 miles south of Miami, Fla., 40 fms. 

 Albatross Station D. 2362, east of Yucatan; 22° 08' 30" N.; 



86° 53' 30'' W.; 25 fms.; coral sand. 

 Albatross Station D. 2365, east of Yucatan; 22° 18' 00" N.; 

 87° 04' 00" W.; 24 fms.; white rock coral. 

 Plesiotypes.— Cat. No. 7594, U.S.N.M. 



SMITTINA ECHINATA, new species 



Plate 28, Figures 2, 3 



Description. — The zoarium is hollow, cylindrical, surrounding the 

 delicate radicells of algae. It emits in every direction short conical 

 or flabelliform branches forming an ensemble with the spiny aspect 

 of Echinocava. The zooecia are distinct, separated by a furrow, 

 short, elliptical; the frontal is convex and formed by a granular pleu- 

 rocyst surmounting the olocyst ; it is bordered with large areolar pores. 

 The apertura is elliptical, orbicular, or transverse; it contains a 

 small flat lyrule and two very small, very fragile cardelles. The 

 oral avicularium is smaU and triangular with the beak oriented 

 toward the top; it is placed to the right or to the left of the proxi- 

 mal border of the apertura. The ovicell is large, globular, perfo- 

 rated by some large pores. The pleurocyst does not cover it entirely 

 and leaves a large circular area. 



,, . . ^ {^a = 0.10 mm. 



Measurements. — Aperturau „,„ 



^ lZa = 0.10 mm. 



ry . [is = 0.35 mm. 

 Zooecmm 7 ^ ^^ 



U3 = 0.20 mm. 



Affinities. — This species is extremely fertile, for on our specimens 



almost all of the zooecia are ovicelled. The peristone is thin and 



salient and is little visible on the ovicelled zooecia. The small zoo- 



ecial dimensions and its curious colonies characterize this species 



very well. 



