142 THE NAUTILUS. 



misellus Morelet can represent a single species. If Fig. 4, plate 33, 

 is not an abnormal or diseased shell it must be a Solenaia, probably 

 the Solenaia (Mycetopus) ragatus Sowerby. 



The figures 3, and 4, plate 32, are equally impossible. They are 

 supposed to be Trapezoideus foliaceus, Gould, but are really an un- 

 described shell, not far removed from the N. dimotus Lea (figured in 

 the work, on plate 19). I have had for several years, a set of 

 these, purchased, with a label " Trapezoideus foliaceus, Gould, Ex. 

 Berlin Museum, Birma," and possibly a part of the same lot figured 

 by Dr. Haas. Not being able to match them with Gould's species, 

 I submitted them to Dr. Dall, who placed them near to dimotus, I, 

 therefore propose for the species as figured by Haas, (fig. 3, and 4, 

 plate 32) the following name. 



PARRETSIA DALLIANA n. sp. 



Shell small, rather thick, somewhat ovate. Length (of a medium 

 specimen) 4.5 ; htigbt (near end of ligament) 2.7 ; Diameter 2, 

 mm. Rounded before, basal and dorsal lines nearly straight, post 

 basal point rounded. Epidermis olivaceus, greenish in young shells, 

 brownish in old specimens, and frequently bleached. Beaks very 

 small, pointed, low, and incurved, with fine zigzag radial sculpture, 

 which extends a little down the shell, and especially down the post 

 slope ; in dirty, or eroded specimens hardly to be noticed. The 

 shell is a little inflated, the post ridge rounded. Inside the nacre is 

 soft cream or white. The left valve has two cardinals, the anterior 

 blade-like, and the posterior much smaller, and tubercular. The 

 laterals are double (or even inclined to be trifid); in the right valve 

 the cardinals are split or double, and the laterals single. 



The anterior cicatrices are confluent, and also those of the poster- 

 ior. 



Habitat is stated to be " Birma." 



The shell is stouter, shorter and more inflated than /*. foliaceus, 

 and the posterior portion is not as green. The species lacks the 

 sculpturing of P, dimotus, and the direction of the cardinal teeth is 

 different. The shell is a Parreysia according to Simpson's ideas of 

 classification. 



