Pterynotus richeri: Except for an empty shell dredged off the Kermadec Islands (NMNZ) all other specimens of P. richeri have been collected alive in 250-500 m, off New Caledonia. The species collected in Fiji and Tonga differs from P. richeri in having shorter shoulder spines (PI) and in having P2-P6 extending as short spines, connected by webbing. In P. richeri the shoulder spine is almost twice the size, and P2-P6 are almost indiscernable, fused in a broad, adapical webbing. The Fiji and Tonga form has also been collected off New Caledonia (MNHN) and till now has been tentati¬vely identified as P. richeri. It is probably more closely related to P. vespertilio (Kuroda, 1959).