146 CRETACEOUS GASTROPODA 
XIV. Family,—PURPURIDZ. 
The animals of the Purrurrp# are in general much like those of the Buccrrwx 
except that the foot does not terminate posteriorly in a separate process, and is in 
-general stouter and more truncate; the tentacles are never very long, and the eye- 
pedicles unite with them, terminating at half the length of the former. The oper- 
culum is oblong, with an elongated nucleus at the outer edge. 
The shell of the Pvrevrrpz is usually distinguished by the shortness of the 
‘spire and large size of the last whorl, being anteriorly either notched or produced 
into a canal; the inner lip is smooth, occasionally toothed posteriorly and anteriorly ; 
it isalways somewhat flattened, where the columella terminates, forming inside a more 
or less distinct edge. According to Gray (Guide, 1857, pp. 18—21) two sub-families 
may be easily separated, purpuRINe and RAPANINA. 
I may mention beforehand that the classification of Nisea, Leptoconchus, Mela- 
pium, and Separatista is somewhat uncertain, and still more doubt can be entertained 
regarding Pinaxia; the genera themselves—except perhaps Separatista, which 
may rather belong to the Zrrcxorroprp#—require confirmation in many points, 
before they can be universally accepted and placed accordingly in the system. I 
shall therefore not include these doubtful genera in the present list, although the 
first three named, if otherwise correct, can scarcely be classed in any other family 
than this, the two former in the purpuvrrn 2, the latter in the RaPaniya, 
a, Sub-family— PURPURIN Ai* 
Genera; 1. Jopas, H. and A. Adams, 1858 (Gen. I, p. 128). 
2. Vewxilla, Swainson, 1840 (ibid p. 129). 
3. Purpura, Bruguiere, 1789 (ibid p. 126), with sub-genera, several 
of which may have generic value. 
4. Purpuroidea, Lycett, 1848. 
5. Monoceros, Lamarck, 1809 (Acanthina in H. and A. Adams’, 
Acanthiza in Gray’s Guide, 1857). 
6. Mitrella, Risso, 1826 (?) (vide Adams’ Gen. II, p. 620). 
Sistrum, Montfort, 1810. (ibid Vol. I, p. 130). 
8. Ricimula, Lamarck, 1812, if worthy of distinction from the former ; 
Pentadactylus, Klein, apud H. and A. Adams, loc. cit. I, 
p. 129. 
9. Concholepas, Lamarck, 1801. Conchopatella, apud H. and A. 
Adams, loc. cit. I, p. 132. 
10. Magilus, Montfort, 1810. Campulotus apud H. and A. Adams, 
loc. cit. I, p. 188. 
Except Purpuroidea, a genus established for a jurassic group of shells, un- 
doubtedly allied to Purpura (in parte), there are no secondary species as yet known 
which may not be objected to as belonging to this sub-family. Of Purpuroidea itself 
only two cretaceous species have been reported: one of these occurs in the Alpine 
Gosau deposits, P. Reussi, Hérnes (Denksch. Akad. Wien, X, p. 177), but its 
%* Purpurina, D’Orb., belongs probably to the TRICHOTROPIDH (vide postea). 
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