312 SPECIES OF THE SYSTEMA. 
pied OF Cal 3 it 6 pray 
Trochus Miloticus. 
The Trochus Niloticus of authors (Chemn. Conch. Cab. 
vol. v. pl. 167, £1605) is marked for this shell in the Linnean 
collection; and “List. 617” is correctly added to the synonymy 
in the revised copy of the ‘Systema,’ where ‘labio interiore 
subbilobo” has been annexed to the diagnosis, and “ Figura 
lateribus convexa”’ concludes the details. The synonyms are 
generally accepted, except the reference to Argenville; the 
figure of Olearius, however, is too rude for certain identification, 
yet exhibits the general aspect of the species. 
Trochus maculatus. 
The synonymy of T. maculatus in the tenth edition of the 
‘Systema,’ when purified by the comparison of the cited figures 
with the “carina dentata” of that publication, leaves only the 
young of Niloticus (Rumph. pl. 21, f. 3, 4) in harmony with the 
description: the majority of the engravings represent mature 
examples of the same shell. In the ‘Museum,’ and in the 
subsequent edition of the ‘Systema,’ different diagnoses were 
substituted, and a very different species was intended. None 
of the four Trochi (Niloticus, virgatus, &c.) indicated by the 
references of the former publication, correspond with the de- 
tails there specified, which, although many in number, are not 
sufficient, without an illustrative figure, to define a member of 
so extensive a genus as T'rochus. From the enumeration of 
the points of difference between this and the preceding, annexed 
to the latter in the twelfth edition of the ‘Systema,’ we inci- 
dentally learn that the base was flat and sculptured, the throat 
grooved, and the pillar toothed (the “ obsolete bilobo” has been 
changed to “obtuse dentato” in the Linnean manuscript). 
