684 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



Addendum 



Accounts of the following two species have appeared since the 

 present revision was prepared. 



Isurus paucus Guitart Manday, 1966, was proposed as a new 

 name for Lamna punctata of De Kay (1842) but was based on 3 adult 

 specimens (female 2,450 mm. t.l.; male 2,030 mm., and female 2,260 

 mm. long from snout tip to precaudal pit) from Cuba. The measure- 

 ments, description, and discussion of the Cuban specimens in Guitart 

 Manday's account leave no doubt that his paucus is conspecific 

 with my ahtus described here on p. 677. In consequence, alatus 

 becomes a junior synonym of paucus. Guitart Manday's proposal, 

 however, that paucus is the same species as De Kay's punctata is 

 open to question although whatever the answer, it wall not affect 

 nomenclature. 



Lamiostoma belyaevi Gliickman, 1964, was described on dental 

 characteristics from material taken in deep water in the Pacific. 

 Gliickman (1964, p. 105) designated belyaevi as type species of a 

 new genus Lamiostoma, which he placed in a new family, Lamio- 

 stomatidae. He diagnosed the Lamiostomatidae as having more 

 than 3 and up to 8 functional teeth in the first series on each side 

 of the symphysis of the jaw, whereas in his family Isuridae there 

 are only 1 to 3 functional teeth. Gliickman's illustrations of belyaevi 

 (fig. 31, a photograph of the anterolateral aspect of a dried, mounted 

 specimen; fig. 32, a photograph of the lower jaw, possibly of the same 

 specimen as in fig. 31; and pi. 31, figs. 13, 14, 18, and 19, photographs 

 of individual teeth) strongly suggest that he had an Isurus and that 

 the high number of apparently functional teeth was due to exposure 

 of the replacement teeth behind those normally functional (this 

 could well be due to removal of the inner labial membrane surrounding 

 the replacement teeth when the specimen was prepared for mounting). 

 Figure 31 also suggests that belyaevi has notably long pectoral fins 

 and is dark colored or dusky under the snout and head— features 

 characteristic of I. paucus. Evaluation of the status of belyaevi, 

 however, cannot proceed until more information is available, par- 

 ticularly on its proportional dimensions, its teeth, and its color. 



