1889.] NATURAL SCIENCES OF PHILADELPHIA. 113 



gradually diminish in size. In the lower part of the mesentery, be- 

 low the level of the stomatodreum, the arrangement of the muscle 

 processes is veiy different (PI. VI, fig. 6). Throughout the greater por- 

 tion of the non-gonophoric region of the mesentery they are very 

 small, hut as the gonophoric region is approached they suddenly in- 

 crease in size, forming a strong projection, and then just as suddenly 

 diminish again, the projection being of slight extent. The parieto- 

 basilar muscles are well developed and form conspicuous folds. Both 

 external and internal mesenterial stomata are present (PL VII, fig. 1). 

 All the mesenteries with the exception of those of the first cycle are 

 gonophoric. 



The differences, between D. bermudensis and D. delicatula may be 

 briefly enumerated as follows : 



D. bermudensis. D. delicatula. 



Tentacles 96. Tentacles 160. 



Fronds digitiform, about 12 in Fronds dilated at the extremity, 



number. about 42 in number. 



Mesogloeal processes of sphincter Mesogloeal processes of sphincter 



muscle rather delicate, anas- stout, not anastomosing. 



tomosing slightly. 

 Ectodermal muscle processes of Ectodermal muscle processes of 



disc wanting (?) disc, long and delicate. 



Sttb Tnbe STICHODACTYLINsE. 



Family PHYMANTHIDJE. 



5. Phymanthus crucifer. (Les.) Andres. 



A single specimen of this species was obtained. I have nothing 

 to add to the statements already made regarding it in my paper on 

 the Bahama Actiniaria. 



Tribe ZOANTHE/E. 



Family ZOANTHIDJE. 



6. Zoanthus flos-marinus. Duch. and Mich. (PI. VII, figs. 3 and 4.) 



A large number of specimens of this species were obtained, and 

 enclosed with them was a label stating that they were collected at 

 Shelly Bay, Tuckerstown. In general appearance they resemble Z. 

 ^soeiatus from the Bahamas, the individuals as in that species forming 

 stolon-like prolongations from which new individuals bud ; their 

 .structure, however, shows them to belong to a different species. The 

 -colonies are, according to the accompanying label, 4 to 5 cm. in 



