»longiore, utrinque rotundata; dente cardinali unico, den-* 
stibus lateralibus magnis. 
Fra Cragformen synes vor at afvige ved en mere 
regelmæssig rund oval Form. 
Størrelsen er 2” anteriopost. 1.67” umboventr. Diam. 
Forekomst: 
Fayne. 
Dr. Jeffreys og Monterosata har nevnt den fra Korea, 
Biscaybugten og Sicilien, 
Den forekom kun paa St. 192—649 
Lyonciella Jeffreysi, Fr. 
Pl. XII, Fig. 15, 16. 
Lyonciella Jeffreysi, Friele, ,,Cat. Spitzberg. Moll.“ Jahrb. 
Mal. Gesell. 1879, Pag. 269. 
Skallen noget solid, hvid, oval trapezoideformig; po- 
sterior Dorsalrand næsten ret, anterior kort fremspringende 
og i en nær ret Vinkel bøier den ned mod Ventralranden, 
der atter krummer stærkt op mod den svagt afrundede 
posterior Rand. Umbonerne fremtrædende, foranbøiet og 
incurvat; Partiet fra Umbonerne og ned til bageste Ven- 
tralrand er opsvulmet, Dorsalpartiet er derimod nedtrykt 
og paa Skallens indvendige Side viser sig her en Fold. 
Sculpturen bestaar af talrige, svagt hævede Linier, der 
radierer ud fra Umbonerne mod Skallens Periferi, samt 
tætte, men uregelmæssig stærke Veekstlinier. Laaslinien er 
uden Tænder, Muskelindtrykkene tydelig. 
Skallen perlemorglindsende. 
Indvendig er 
Størrelse: 23” anteriopost. 26”” umboventr. Diam. 
Forekomst: St. 295, 312 fra 656 til 1100 Favne. 
I ,Report on the scientific Results of the voy of 
Challenger* Zool. Vol. XITT Lamellibranchiata 1885, Paa. 
73, Pl. XXV, Fig. 1, 1 6 har Mr. Edgar A. Smith ogsaa 
beskrevet en Lyonciella Jeffreyst. Der synes ikke at være 
saa liden Lighed imellem disse to, der tilfældigvis har faaet 
samme Navn, men de er dog neppe nok samme Art. Mr. 
Smiths Jeffreys: er nemlig: foran mere truncat og ikke saa 
fremspringende og posterior mere afrundet. For ikke at faa 
Confusion vil jeg foreslaa Lyoneiella Smidti for Challenger- 
Arten. 
Det er mig en Tilfredsstillelse at se, at ogsaa Mr. Smith. 
(1. c. Pag. 165) under de kritiske Bemærkninger over Slæg- 
ten Verticordia, Wood, kommer til de samme Resultater, 
som jeg allerede i 1879 (,,Cat. Spitzb. Moll.“ Jahrb. Mal. 
,longiore, utrinque rotundata; dente cardinali unico, den-* 
ptibus lateralibus magnis.* 
Ours appears to differ from the Crag-form in having 
a more regular rounded oval form. 
Size. Anterio-posterior diameter, 2””, umbo-ventral 
diameter, 1.67”, 
Habitat: It occurred, only, at station No. 192. Depth 
649 fathoms. 
Dr. Jeffreys and Monterosata have cited it from the 
Corea, Bay of Biscay, and Sicily. 
Lyonciella Jeffreysi, Fr. 
1895 NONE sne) Hud 
Lyonciella Jeffreysi, Friele ,Cat. Spitzberg. Moll.* Jahrb. 
Mal. Gesell. 1879, pag. 269. 
Shell somewhat solid, white, oval-trapezoidal, posterio- 
dorsal margin almost straight, anterio-dorsal margin short 
and projectant, and curving at a nearly right angle, down 
towards the ventral margin, which, again, bends sharply 
upwards towards the slightly rounded posterior margin. 
The umboes prominent, bent forward and incurvate. The 
portion of the shell, from the umboes down to the poster- 
ior ventral margin is dilated. The dorsal portion is, on 
the contrary, flattened, and upon the interior side of the 
shell a fold is, here, visible. The sculpture consists of 
numerous, slightly elevated, lines, which radiate from the 
umboes towards the periphery of the shell, and, also, of 
close but irregular, strong, lines of growth. The hinge 
line is devoid of teeth. The muscular impressions distinct. 
The shell has, interiorly, a mother-of-pearl lustre. 
Size. Anterio-posterior diameter, 23”", umbo-ventral 
diameter, 26", 
Habitat: Stats. Nos. 295, 312. Depth, 656 to 1100 
fathoms. 
In ,Report on the scientific Results of the Voy. of 
Challenger* Zool. Vol. XIII. Lamellibranchiata, 1885, 
pag. 73, Pl. XXV, figs. 1, 1 b. Mr. Edgar A. Smith 
has, also, described a Lyonciella Jeffreysi. There appears 
to be no inconsiderable resemblance between these two, 
which have accidentally obtained the same designation, but 
they pertain, however, barely enough to the same species. 
Mr. Smith's Jeffreyst is, for instance, more truncate anter- 
iorly and not so protuberant, and its posterior is more 
rounded. To prevent confusion, I would suggest Lyonciella 
Smidti as a designation for the Challenger species, 
It is with much satisfaction I observe that Mr. Smith, 
also, (lL c. pag. 165) in his critical remarks upon the 
genus Verticordia, Wood, arrives at the same results as I, 
already in 1879, had expressed (,,Cat. Spitzb. Moll.“ Jahrb. 
