DALL: MOLLUSCA AND BRACHIOPODA. 391 
gonia, Couthouy; Port Rosario and Wolsey anchorage, 17-30 fathoms, Alert 
Expedition. 
This species seems extremely abundant, and the hundreds of specimens. col- 
lected by the “ Albatross” enable the full range of variation to be traced, from 
which the above synonymy results. The color varies from nearly black to light 
yellowish brown. There is a small angular pallial sinus. There is no chondro- 
phore, and, while a small gap intervenes between the anterior and posterior rows 
of teeth, the resilium, which seems to be obsolete, does not occupy it. ‘The liga- 
ment doubtfully passes in front of the beaks, unless as a mere functionless film. 
I have compared Gould's type, still preserved in the National Museum, with the 
“Albatross” specimens. The species differs from the type of Tindariopsis 
(T. agathida Dall) in possessing a small angular pallial sinus, and might therefore 
be put in a separate section if such fine discriminations be regarded as desirable 
1n so variable a group as this. 
That this species, belonging to a different genus from Risso's shell, was erro- 
neously referred to Leda, does not oblige us to reject the name of Couthouy and 
Gould, 
PHASEOLUS JEFFREYS. 
Phaseolus (Jeffreys MS.) Monterosato, Atti Accad. Scienze, Palermo, 1875, pp. 4, 11 
(nomen nudum); von Martens, Zool. Record for 1876, p. 205; Jeffreys 
(olim) P. Z. S. Lond., 1879, p. 573; Seguenza, Nucul. Terz. Ital, 1877, 
p. 1182; type, P. ovatus Jeffr. 
Silicula Jeffreys, P. Z. S. Lond., 1879, p. 573; type, S. fragilis Jeffreys. l. c., p. 574, 
pl. 45, figs. 6, 6a; Seguenza, Form. Terz. de Reggio, 1879, p. 284; Verrill, 
and Bush, Am. Journ. Sci., 1897, ser. 4, 3, p. 62. 
Jeffreys’ manuscript name Phaseolus, applied to one or two fossil species from 
the Italian tertiaries, was printed by Monterosato and Seguenza before Jeffreys 
himself had given a diagnosis. The sole example of the genus illustrated by 
Seguenza in 1877 was P. ovatus. Apparently without knowing of this publica- 
tion, in describing a recent shell from the Porcupine expedition dredgings, in 
1879, Jeffreys substituted for his original manuseript name another, Silicula, 
With a single species S. fragilis, These shells, though having rather a similar 
Inge, are otherwise quite unlike, so that in 1897 Verrill proposed to retain both 
hames as follows, the characters having been recast from authentic specimens. 
Prasronus (Jeffreys MS.) Seguenza, type P. ovatus Jeffreys. 
Shell short-ovate, the hinge subequal on each side of the beaks, the two series 
Meeting at an obtuse angle under the beaks, valve practically equilateral; no 
Pallial sinus, ligament? teeth lamellar, few, subequally divided. 
Sruicura Jeffreys, type S. fragilis Jeffreys. 
Shell very inequilateral, beaks at the anterior third, calyculate; an oblique 
chondrophore and internal resilium, external ligament obsolete ; hinge line nearly 
