SI iiilii'S nil inai'ilir Osli'iicods 



303 



Fig. LI II. — C. (Siphonoalra) spinifera il. S|)., 9- — ■'• -Slu'll. ^^<'''ll from the side; '«() X. 'i. Shell, .seen finm lielow. the 



opening of the siphon reprosenlod by a dolled circle; 31 X. 5. .Vnterior part of the righl valve, seen from the Inner 



side: iri8 X. fi. One of the anterior bristles on the list jnsl behind Ihe rostral incisnr of the shell: 617 X. '. T'pper 



lip. seen fi'om the side: Ififi X. S. Fiirca: Ihe serond:iry li'i'th of Ihe rlaws are not drawr.: Ififi X. 



