The Bryozoa of the Tortugas Islands, Florida. 



187 



Bugula neritina var. minima Waters. 



Waters, 1909, p. 136. 



One small colony with ovicells abundantly developed and with numerous 

 avicularia (as described by Waters in Red Sea specimens) was taken at a 

 depth of 8 fathoms. Previously known only from the type locality. This 

 variety is distinguished from the typical neritina by the smaller size of its 

 zooecia and by the presence of avicularia situated near the lower end of the 

 zooecia. 



Bugula flabellata (Gray). 



Gray, 1847, p. 106 (Avicularia flabellata).— Sum, 1872, p. 18.— Verrill and Smitt, 

 1873, P- 711- — Verrill, 1879&, p. 189; 1880, p. 29 (Bugula flustroides). — 

 OsBURN, 1912, p. 225. 



A single small colony of this species, attached to Retepora atlantica, was 



taken at a depth of 12 fathoms. The ovicell is more widely opened than 



in Woods Hole specimens. A very widely distributed species, occurring 



northward on our coast to Maine. Miss Robertson found it at San Diego, 



California. 



Bugula microoecia n. sp. (Figs. 1 to 3.) 



II 



Fig. I. — Bugula microxcia n. sp. Front view of portion of branch, showing details. Upper two ooecia not 



quite complete. Lower one complete with embryo. 

 Fig. 2. — The same. Portion of main branch showing joints. Degenerate polypides are present. 

 Fig. 3. — ^The same. Portion of stem higher up, showing less-modified zooecia. Remains of degenerate poly- 



pldea within. 



Zoarium delicate, composed of a central stalk with long, narrowly 

 flabellate branches arising in an irregular dichotomous fashion from the 

 main stem. The stalk, as well as its branches, consists of very much 

 elongated and modified zooecia arranged biserially. That these are really 

 zooecial in character is shown by the fact that they contain polypides and 

 occasionally one of them even bears an avicularium. Notwithstanding 

 this, definite joints appear at the bifurcations of the main and all the 

 accessory branches. These conditions show an interesting connecting link 



