260 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
diella Fischer, 1883; and also includes a large number of Bellardi’s species of 
Homotoma according to Cossmann, who makes the group under the name of 
Bellardiella a subgenus of Daphnella which he thinks has a similar nucleus. It 
is curious that, while the figure of the nucleus given by M. Cossmann (that of 
Murex textilis Brocchi) correctly illustrates the nucleus of Daphnella, the nucleus 
of Bellardiella gracilis is entirely different. It is irregularly coiled and swollen, 
without sculpture, except for the punctations which are a feature of the whole 
surface of this species, and on the last whorl, which assumes a strong peripheral 
carina before the mature sculpture begins to be developed, The nucleus of 
Daphnella, on the other hand, is a typical * Sinusigera.” So it would seem as if 
Bellardiella (gracilis), whether it agrees with the typical form of Defrancia 
(= Clathurella) or not, can at least not be united with Daphnella on account of a 
similarity of its nuclear characters, 
As three of Millet's five species are the victims of a more or less complicated 
and possibly doubtful synonymy, and no type was mentioned in the original 
publication, it is best to take as type one of those which seem free from uncer- 
tainty, and preferably his largest and first species, Defrancia pagoda (pl. 9, 
fig. 1). It should not be forgotten, however, that Millet himself points out that 
the subsutural callus mentioned in his diagnosis is not invariably present. As 
Clathurella takes the type of Defrancia, the species just mentioned will serve the 
substituted generic name in the same capacity. 
GiyrHostoma Gabb, 1872. Shell small, fusiform, elegantly and profusely 
sculptured; aperture varicose, columellar lip lirate or denticulate, the outer lip 
similarly ornamented; sinus deep and conspicuous, canal moderately produced 
and recurved, operculum absent; nucleus conie, of a few polished unicarinate 
whorls. Type G. dentifera Gabb. 
This group is related to Clathurella, from which it differs by the dentate or 
lirate pillar lip in the adult, and the very conspicuous anal sulcus. The species 
assigned to it have a common facies which cannot be mistaken when once recog- 
nized, and having usually a brilliant surface polish, are among the most elegant of 
small gastropods. The suture is less constricted and the whorls less rounded 
than in Clathurella. 
Eusera Dall, 1889. Shell small, thin, glossy, polished, the outer lip sharp, 
simple, arcuate ; pillar and inner lip simple, canal inconspicuous, reduced to a 
mere angle as in Trichotropis, operculum wanting, nucleus of the Sinusigera type; 
anal suleus at the suture, very inconspicuous and shallow. Type Daphnella 
(Eubela) limacina Dall. 
The typical species has a pretty garland of nodules in front of the suture but 
this proves to be merely a specific character. 
SURCULINA Dall, 1908, nov, Shell of moderate or small size, slender, elongate- 
fusiform, the earlier whorls feebly ribbed or axially sculptured, the later ones with 
fine even spiral sculpture ; spire acute, suture appressed, aperture long and nar- 
row; both lips perfectly simple ; pillar straight, outer lip gently arcuate, anal 
