566 A. E. Verrill — Anthozoa and Sydrozoa of the Bertnudas. 



Analytical table of West Indian Species of Zoaiithiis. 



A. — Tentacles short, subequal, in two alternating series. 



B. — Coenencliyma mostly in the form of tubular or band-like stolons. 



C. — Tentacles 50 to 60, or more. 



d. — Column usually clavate and pedunculate ; stolons mostly tubular ; clusters 

 open. 



e. — Greatest diameter of column usually 4 to 5""" ; height 25"'™ or less, column 

 usually bluish green or violaceous distally ; prevailing color of disk, green 

 or blue, variegated or radially spotted with brown. Z. sociatus Les. 



ee. — Greatest diameter of column Hmm . expanded disk 13-14"™ ; height of 

 column up to 50'"™ or more. Prevailing colors of column yellowish or red- 

 dish ; of disk and tentacles, yellowish, reddish, or red-brown. Test " coria- 

 ceous" ; "ovaries, 20" (t. Leseur). Z. Solandri Les. (type). 



dd. — Column usually nearly cylindrical, not distinctly pedunculate ; stolons 

 mostly flat and band-like ; clusters close, exposed. Size " one-third smaller 

 than sociatus" (t. Les.). Z. diibius Les. (tyj^e). 



CC. — Tentacles 48-52. Column protean, may be cylindrical, jug-shaped, sub- 

 clavate, and trumpet-shaped in one colony. Stolons variable, mostly nar- 

 row. Diameter of column, usually 5 to G"""" ; height up to 20™'", mostly less. 

 Prevailing color of disk and tentacles, green. Test with a rough cuticle 

 proximally. Z. proteus Ver. 



CCC. — Tentacles about 36. Size large. Column somewhat clavate, but with a 

 wide base. Clusters open. Diameter of column distally about 15™'" ; its 

 height up to 35™™ ; diameter of expanded polyp, 20'"™ ; length of tentacles, 

 2.5™™ (t. fig. by Duch. and Mich.). Column greenish distally ; a ring of 

 green around the mouth. Z. flos-marinus D. and M. (type). 



BB . — Coenenchyma mostly lamellar or membranous, polyps short, clusters usually 

 rather close. 



/. — Column short, usually obovate, swollen, pedunculate. Mammillifera Les. 



Tentacles about 52-60.* About 60 mesenteries, of which 27 are perfect and 

 bear ovaries (t. Leseur, p. 184, and pi. viii, fig. 3). Diameter of column, in 

 contraction, about 6™™ ; in expansion about 7™™; height, 7-8™™. Test "soft 

 and smooth." Disk greenish ; tentacles and column reddish (t. Les.). 



Z. auricula (Les.). 



* Leseur, on p. 178, Journ. Phil. Acad., i, 1817, gives the number of tentacles 

 as 26-30, but this is evidently an error, probably due to the fact that only one 

 cycle was shown in the drawing. In his remarkably accurate transverse section 

 he shows 61 mesenteries, and also indicates the directives, the inequality of the 

 pairs, and the bilateral arrangement of the later jjairs, — features that were 

 ignored by later writers for nearly half a century ! (See these Trans., 1, p. 495.) 

 As the number of tentacles, in this family, corresponds to the mesenteries, it is 

 safe to assume that 52 to 60 are the usual numbers. McMuri;ich and others have 

 been misled by this error (see McMurrich in Ann. N. York Acad., ix, p. 189, 1876). 



