MOLLUSCA: 97 
genus are spirally turreted, resembling a Turbo or Turri- 
cula. Several species are figured by Sowerby in his Méne- 
ral Conchology. 
The genus Scarurres, formed by Parkinson, possesses 
very peculiar characters. It commences with a depressed 
volution, the last turn of which, after being enlarged and 
elongated, is diminished and reflected inwards. 
2. Multilocular testacea with the shell produced. It 
must be confessed, that the genera of this section are but 
imperfectly understood. The recent kinds are too small to 
admit of any investigation of the animal, so that we are 
left entirely to conjecture. 
The genus Hirrurirss is of a conical form, and either 
straight or crooked. Within it is transversely chambered, 
and furnished with two lateral, longitudinal, obtuse, con- 
verging ridges. The last chamber is closed by an operculum. 
In the OrtHoceRA the shell is straight or slightly bent, 
and conical. The chambers are distinct, and pierced with 
a tube. We possess on our shores many minute species of 
this genus. 
The genus Bacuuites of Faujas St. Fond possesses a 
structure similar to the ammonites, the inner walls being 
articulated with sinuous sutures, and the partitions perfor- 
ated. The shell is fusiform or bent into two parallel limbs. 
Mr. Parkinson has contributed greatly to our knowledge of 
this genus, and has termed it Hamites. We prefer the name 
of the original discoverer to that of our English naturalist, 
vhich is very faulty. For, according to Pliny, “ Hammites 
yvis piscium similis est.” 
In the Betemnires the shell is straight, conical, pointed, 
iolid at the summit, and furnished with a lateral gutter. 
here is seldom more than one of the cells apparent, of a 
F 
