JsonConvert.DeserializeObject knowing class name (string)

I've a vb.net class that includes some serializable sub-classes

Public Class Model
    <Serializable>
    Public class foo
        Public Property id as Integer
        Public Property name as String
    End Class

    <Serializable>
    Public Class bar
        Public Property grading as Integer
        Public Property minWage as Decimal
        Public Property maxWage as Decimal
    End Class
End Class

Now I receive from a web service, an object (as json formated string) and its class name (as string) and I'd like to Deserialize it as my object.

I could do, as it is actually working, a

Imports Newtonsoft.Json
    
Public Shared Function Deserialize(ByVal Json As String, ByVal name As String) As Object
   
    Select Case name
        Case "foo"
            Return JsonConvert.DeserializeObject(of Model.foo)(Json)
        Case "bar"
            Return JsonConvert.DeserializeObject(of Model.bar)(Json)
    End Select
End Function

But as you can imagine, I've a ton of classes, not just 2, so I tried to use Reflection

Imports System.Reflection
Imports Newtonsoft.Json

Public Shared Function Deserialize(ByVal Json As String, ByVal name As String) As Object

    Dim assembly As Assembly = Assembly.GetAssembly(GetType(Model))
    Dim type As Type = assembly.[GetType]("Model." & name) ' Why is this always Nothing?
    Dim objInstance As Object = Activator.CreateInstance(type)
    '        objInstance = JsonConvert.DeserializeObject(Of ???)(Json)

    Return objInstance 
End Function

But on one hand the type variable is always Nothing, and on the other hand, I don't know what to put instead of the comment.

Can you please advise ?