MUSEUM OF COMPARATIVE ZOOLOGY. 289 
Fine and very large specimens of this species have been dredged by the Fish 
Commission in the Gulf of Mexico. 
An account of the soft parts will be found under the discussion of the generic 
characters. 
Verticordia Woodii Smirx. 
Verticordia Woodii Smith, Chall. Rep. Lam., p. 168, pl. xxv. figs. 7-7 b, 1885. 
A fragment, probably belonging to this species, was dredged in 100 fms. at 
Barbados by the “ Hassler” in 1871. 
Verticordia perversa Dati. 
Shell translucent, thin, small, very much the shape of Arca pectunculoides, 
but with the beaks turned toward the larger end, equivalve, inequilateral, 
waxen white; surface covered with excessively minute shining elongated 
granules radiating from the beaks in single series with equal interspaces; there 
are also between twenty-five and thirty radiating lines, on which extraneous 
matter, especially sand grains, seems to stick, though I can perceive no epi- 
dermis or special formation which should induce the sand to stick on these 
lines and not between them; there are no ribs under them. All these lines 
curve forward with an even sweep; if we consider the hinge-line as horizontal 
the anterior margin will be nearly vertical, and their junction evenly rounded, 
with no trilobate appearance in the general outline; the highest part of the 
shell is anterior; from the rounded anterior basal edge the posterior basal edge 
rises at an angle of 45°, or so, toward the rounded junction with the hinge- 
margin ; the beaks are rather low, the area about them is full but not inflated; 
there are no keels on the shell; the lunule is small but indented, and its inner 
edge in the right valve is convex and fits into a concavity in the opposite valve; 
behind it in the right valve is a short but stout squarish tooth, on the other 
side of which is the ossicle longer than wide, and indented behind; there are 
no teeth in the left valve; the interior is polished, the granules showing 
through the shell. Max. lon. 5.0; max. alt. 5.0; diam. 3.0 mm. 
Habitat. Dredged by the U.S. Fish Commission steamer “ Albatross” at 
Station 2678, off Cape Fear, North Carolina, in 731 fms., bottom temperature 
38°.7 F. 
This little shell is remarkable for having its height and maximum diameter 
thrown forward, as in Lyonsiella gemma Verrill, but even more so, without 
being lobed as are several species in which a similar tendency is indicated but 
not carried out; it is so rounded withal that it looks like a short Modiola with 
the beaks turned the wrong way. I have seen no other species which resembles 
it at all. 
VOL. XII. — no. 6. 19 
