246 bulletin: museum of comparative zoology. 



Turbinoseris jamaicaensis, sp. no v. 



Plate XL. Figs. 8-10. 



Corallnm siibconical, tip oi base a small nipple-like pedicel. Height of 

 corallum, 19.5 mm.; greater diameter, 15 mm.; lesser, 13.5 mm. The ex- 

 ternal surface covered with small, densely crowded granulate costse, alternately 

 larger and smaller in size ; synapticulse abundant between them. The wall is 

 for the greater part synapticulate and perforate, but in places it is solid to a 

 greater or less extent. Septa very numerous and very much crowded; there 

 are over 100, so there are more than five cycles, but the sixth is not complete; 

 their margins apparently finely dentate; the septa of the lower cycles are 

 thicker around the axial space than peripherally. The calicular fossa is 

 narrow and deep. There is no columella, but some of the principal septa 

 meet in the axial space. 



Locality. Near Cambridge Station, south of Montpelier, St. James Parish 

 (R. T. Hill, collector). 



Type. Museum of Comparative Zoology, Harvard University. 



Remarks. This species differs from the preceding, T. cantahrigiensis, by its 

 more robust form, and the inner thickening of the larger septa. The calicular 

 fossa is deeper and narrower. It is closer to T. eoccenica, Duncan, from which 

 it differs in its form. The axial ratio for T. eocoenica is ^""^J ^^|^^" ; for T. ja- 

 maicaensis, 'jj-jniii! ; the former is much more compressed laterally. 



It is evident that T. cantahriglensis and T. jamaicaensis are very close to 

 each other, and both are extremely near to T. eoccenica, but as diflferences of 

 considerable importance exist between all three of the forms, it is best to 

 regard them as specifically distinct. 



MESOMORPHA, Pratz. 

 Mesomorpha catadupensis, sp. nov. 



, Plate XLI. Figs. 1-3. 



Corallum depressed, flat above, transverse outline, subelliptical. Measure- 

 ments : height (thickness), 7 mm.; greater distance across, 26 mm. ; lesser 

 distance across, 24 mm. The base of the corallum has on it some concentric 

 folds, and there is an incomplete epitheca. The costoe are low, equal, and 

 have synapticulse between them. The outer or common wall probably is 

 synapticulate, i. e. probably there is none, strictly speaking. The calices are 

 concentrically arranged. In the centre is a larger calice, outside of it are two 

 concentric rings, and near the edge of the corallum some small calices belong- 

 ing to a third one. From the central calice to the calices of the first ring is 

 5.25 mm. The calices in the first ring are usually 4 mm. apart. There is a 

 sliirht variation above and below this number. The distance between the first 



