36 



tral surface rugose, the suckers concealed when retracted, and 

 the scales much more roughened with granules. 



The genera Cuvieria and Psolus have been united in one by 

 Duben and Koren, the name Psolus being suppressed. This 

 arrangement, however, seems incorrect, as the two divisions by 

 their zoological characters present quite manifest distinctions, 

 which are apparently of generic value. They differ in the 

 relative situation of the anal and oral apertures, in the extent of 

 naked ventral surface, in the suckers and in the scales. The title 

 Cuvieria will therefore be retained for those species of which 

 Ciiv. Fahricii is the only representative yet discovered on this 

 side of the Atlantic. 



This occurs on the coast of New England, though not abun- 

 dantly. It appears to inhabit shallower water than Psolus Icevi- 

 gatus, as it has not been detected in the stomachs of fishes, 

 which have afforded many of the latter species. All the speci- 

 mens seen have been drawn up with the hook. The largest is a 

 little over three inches in length. When living, they are of a 

 bright brick red, and the readiness and abundance with which 

 this color is yielded to alcohol, or even to water after death, is 

 quite remarkable. 



The whole upper and lateral surface is covered with large, 

 strong scales, imbricated, and roughened on the part exposed, 

 whh numerous granules. These scales are similar in structure 

 to those of Psolus previously described, but contain much less 

 animal matter. 



The calcareous supports of the suckers are a terminal, per- 

 forated plate, like that of Scl. hriareus, and irregular calcareous 

 concretions, scarcely developed into plates, thickly scattered 

 over the sides of the tube. These concretions are also found on 

 all the ventral surface. 



The tentacula are supported on short, soft pedicles, without 

 calcareous support, so far as yet observed. They are frondose- 

 ramose, ten in number, two or three being much less than the 

 others. The whole oral organs and space are of a bright red- 

 dish flesh color, entirely concealed within the oral pouch at the 

 will of the animal. The oral circle is composed of ten slender 

 pieces much like those of Ps. Icevigatus^ the alternate ones (to 

 which the retractor muscles are attached) bifid at the extremity. 

 These muscles are thick and stout, terminating very abruptly. 



