178 UMBRACULUM. 



epidermis thin, scarcely shining; orange within in adults. (Qor.). 

 Length 1'93, diara. 1'58 inch, (young shell). 



Mouth of the Chiriqui River, Bay of Panama (Bridges). 



Umbrella ovalis CPR., P. Z. S., 1856, p. 161. REEVE, Conch. 

 Icon., vol. xi, pi. 1, f. 3 (1858). 



Concerning this remarkable shell, hitherto only found in the Old 

 World, and, in spite of the bulk of its animal, not observed by either 

 Mr. Cuming, Prof. Adams or Mr. Hinds, Mr. Cuming writes : it was 

 not only brought by Mr. Bridges, but also by a gentlemen in Paris, 

 who collected in exactly the same place. Two specimens are in 

 Mr. Cuming's collection, of which one, very much thickened, ap- 

 pears to have formed part of a much larger shell. (Opr.). 



U. PLICATULUM Martens. PI. 72, figs. 72, 73, 74. 



Shell a little concave, ovate-elliptical, pretty equally rounded in 

 front and behind, with weak wave-like folds, radiating from the apex 

 and especially distinct at the margin, where they are separated by 

 distinctly marked, narrow furrows ; concentrically striated above. 

 Apex projecting wart-like, almost in the middle antero-posteriorly 

 (anterior part to posterior as 7 : 6), but rather excentric laterally 

 (left side to the right as 2 : 3). Under side, as in other species of 

 the genus, with a yellowish colored, radially rib-striated middle 

 field, bounded by a double closed line (corresponding to the pallial 

 line of the bivalves), the yellow color elsewhere not very strongly 

 pronounced, more brownish. Length 62, width 46, alt. 7 mill. 



Matanzas, Cuba (Gundlach). 



Umbrella plicatula MARTENS, Conchologische Mittheilungen, i, p. 

 104, pi. 20, f. 1-3. 



This species is distinguished from U. mediterraneum t as well as 

 from U. indica Lam. principally by the more lengthened contour 

 and plication all around. U. mediterraneum has only in front a few 

 generally stronger folds, U. indica none, U. cumingi Desh. from 

 Bourbon, weaker ones, not continuing to the edge. 



Description and figures from von Martens. It may prove the 

 same as the undescribed Bermudan species. It seems more allied to 

 U. ovalis Cpr. than to other forms. 



U. BERMUDENSE Morch. 



This is a species of nearly the size of U. sinicum. It is known solely 

 by two figures of the living animal drawn by a " young man " for 



