94 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



A Twofold Bay specimen furnished a radula similar to that of its 

 ally tasmanica, T. Woods, but base of rhachidian is less arched. 

 Number of rows 57. Number of cusps on rhachidian 9.^ Laterals 

 stouter than those of tasmanica except at the distal end. (Fig. 3.) 



3. PUSIA. 



p. merula, Sowerby. An immature specimen from Durban, 

 kindly provided by Mr. J. E. Le B. Tomlin. Somewhat resembles 

 that of hizenense, Pilsbry, from Japan. Number of rows 64 plus 

 nascent. (Fig. 4.) 



P. tricolor Gmelin. A specimen from Malta, in the Gwatkin 

 Collection (not recorded by Cooke), has about -55 rows. It is very 

 like the radula of ehenus, Lamarck, but laterals are rather broader. 

 (Fig. 5.) 



The species with radulae of this type are placed by Cooke in a 

 " Group 2 " under Vexillum. One of these species is porphyreticum, 

 Eeeve, which has a squat costulate shell having all the characters of 

 that of microzonias, Lamarck, the type species of Pusia, but of 

 which the radula is not known. Of the remainder, though ehenus 

 and tricolor have longer, smooth shells, their varieties, defrancii, 

 Payr., and savignyi, Payr., respectively, are costulate. Hizenense 

 and merula form another group with shells slightly costulate, but it 

 is significant that Sowerby in his description of merula (Journal of 

 Conchology, vi, p. 8) draws attention to the resemblance of the shell 

 to that of ehenus. Australis differs somewhat from the others, 

 having a smooth shell with much higher spire. 



On the evidence of the radula it seems desirable that Pusia be 

 given generic ranlc and the above-mentioned species be included 

 therein. 



4. Cylindra. 



The radula of C. nucea, Meuschen, is figured in Troschel among 

 those of the Marginellidae, no doubt because of the absence of laterals. 

 The rhachidian, however, is very like that of Vexillum, with 9 cusps, 

 but these are smaller and further apart than is usual in that genus. 

 The British Museum Collection contains a specimen of the radula 

 of C. dactylus, L. It is in bad condition, but evidently lacks laterals. 

 The rhachidian appears to be almost rectangular, with slightly 

 incurved base reminiscent of Mitra and Marginella. The number 

 and form of the cusps cannot be determined. 



1 The rhachidians of three other specimens have 8, 9, and 11 cusps respec- 

 tively. 



