Marwick.—The Struthiolariidae. 169 
n. sp. has rounded whorls throughout, but there are numerous 
fine spirals of secondary and higher orders arranged in groups as obsolete 
cinguli, corresponding to those of related species. It is therefore not so 
primitive a type as at first might appear. 
The наин feature of this group is the presence of spiral cinguli 
which make the spire-whorls bicarinate or even tricarinate ; but the cinguli 
are sometimes obsolete, especially on the body. The spirals are occasionally 
nodular or moniliform, but are generally морон and there are never axia 
ribs. The aperture differs from most of t е losa group in having а 
definitely limited inner lip of regular width, while the callus of the outer 
lip is thick and rounded in cross-section. The sinuation of the outer lip 
is shallow, sometimes obsolete, but the posterior edge of the callus generally 
shows its bisinuate character, which, with the curved columella, indicates 
a relationship closer to Struthiolaria s. str. than to any of the other groups. 
If a sectional or subgeneric name is required it will be Pelicaria Gray, 
1857, with Buccinum vermis Martyn as type (see remarks below under 
Tylospira). 
As already pointed out, the сартар Ass is foreshadowed in the third 
conch- uid of S. subspinosa and 8. c 
The canaliculate suture of such mi as S. canaliculata, S. fossa, and 
S. sui must be considered as a gerontic feature parallelling a similar 
development in Tylospira coronata (Tate 
It is possible that exception may be taken to the specific recognition 
of some of the forms described below. No subspecific, mutational, or 
varietal divisions are used in this paper; but it must be understood that 
the relations between some of the species in a group are much closer than 
those between others. After all, a species is a purely artificial division, 
what is Бави termed a w species." The placing of the pene 
boundary must always be a ыбыз and the better the collection the 
harder it is to decide ; but that two different shells can be connected by a 
series is no reason why the extremes should not be separated specifically, 
especially if the change goes on throughout a aol daréble lapse of time. 
ough the arrangement proposed in this paper is by no means final, 
it will be of much more use to the адар: than the previous one 
4. Genus TvrosPiRA Harris, 1897. 
Genotype : Buccinum scutulatum Martyn. 
Pelicaria was proposed by Gray gel p. 97), who gave as the single 
example, and therefore the genotype, vernis, for shells with a callus 
spreading over the body. The division was recognized sectionally by Tryon 
(1885, p. 134) and subgenerically n Fischer (1887, p. 677), but these authors 
cited B. scutulatum Martyn as an example, and did not mention S. vernis. 
Harris (1897, p. 218) noticed the anomaly, and thought S. vernis to be a 
misprint for S. vermis (Martyn). Consequently Pelicaria became synonymous 
with Struthiolaria, so he proposed Tylospira with genotype B. scutulatum 
Martyn for the calloused species. This proceeding was not approved by 
Cossmann (1904, p. 106), who argued that Gray, “ who knew perfectly well 
S. vermis and В. scutulatum," would not have created a new rae for the 
former, which is nearer to the true Struthiolaria than is the latte 
In support of this he states that “all authors (Tyron, Zittel, d 
have admitted, till now, S. scutulata as the type of Pelicaria." The lat 
