MUSEUM OF COMPARATIVE ZOOLOGY. 29 



No. 3. — List of the Polyps and Corals sent by the Museum of 

 Comparative Zoology to other Institutions in Exchange, with 

 Annotations. By A. E. Verrill. 



ALCYONARIA. 

 Renilla reniformis Cuvier, RegneAn. 2d ed. III. p. .319, 1830 (non IIer- 



KLOTZ). 



Syx. Pennatula reniformis Pallas, Elench. Zooph. 17GG ; Renilla 

 americana Lamarck, 1816 ; Renilla reniformis Agassiz, Proc. Amer. 

 Assoc. 1850. — Charleston, South Carolina; L. Agassiz. 



Renilla Danes Verrill, MS. 1861. 



Sy.v. Renilla americana (pars) DANA, Zooph. PL 57, f. 1 ; Renilla reni- 

 formis Herklotz. 



This differs widely from R. reniformis in its broad, rounded form, it being 

 wider than long, while the preceding is longer than broad ; in its much 

 deeper sinus and overlapping posterior lobes ; in its costate and granulous 

 under surface, which in the other is nearly smooth with lighter radiating 

 lines; in its more crowded and smaller polyps; and in having much more 

 prominent spicula on the upper surface around the cells. Its color, also, is 

 darker purple. — Rio Janeiro ; J. D. Dana, U. S. Expl. Exp. 



Renilla peltata Verrill. 



This is a very large species, readily distinguished by its very broad, thick 

 frond, nearly straight on the outer margin, shallow sinus, and central posi- 

 tion of the peduncle. The cells are larger than in any other known spe- 

 cies, and armed with five prominent spicula. Color of alcoholic specimens, 

 light purple. — Breton Island, near the mouth of the Mississippi River; 

 C. T. Pierce. 



Renilla patula Verrill. 



Very large and thin, with a broadly reniform frond, regularly rounded 

 at the outer margin ; sinus very deep, dividing the frond beyond the middle, 

 with the posterior lobes considerably overlapping. Cells rather small, with 

 five slightly prominent lobes. Polyps very long when expanded. Lower 

 surface slightly scabrous, marked with scarcely raised radiating lines. Pe- 

 duncle attached close to the margin of the sinus. — Cumana, Ven., South 

 America ; J. P. Couthouy. 



Renilla amethystina Verrill. 



Broad reniform, wider than long ; sinus narrow ; peduncle inserted near 

 its edge. Under surface rough, with numerous large spicula. Cells small 

 and crowded. Color deep purple ; spicula amethystine. — Panama ; 

 T. Rowell. 



