182 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 20 



Subgenus BARBATIA s. s. 



Remarks: The differences between this group and subgenus Cucul- 

 laearca Conrad are discussed under the latter group. 



I have examined two species belonging to this subgenus, B. {Bar- 

 batia) cancellaria (Lamarck) from Florida, and B. (Barbatia) lurida 

 (Sowerby) from Baja California. They were both furnished with 

 pigmented eye-spots along the whole mantle margin, especially abundant 

 in the posterior and extreme anterior part. Patten (1886, p. 550) 

 counted between 400 and 500 eye-spots on B. {Barbatia) barbata 

 (Linne) from the Mediterranean. This arrangement is different from 

 that found in Cucullaearca (see under this subgenus). 



Heath (1941) has studied the anatomy of "Barbatia barbata" from 

 Florida, which is probably B. {Barbatia) cancellaria (Lamarck) 1819 

 (= listeri (Philippi) 1849, not Lamarck, Kobelt 1891). This may ex- 

 plain the difference Heath found in the stomach feature (p. 294) from 

 the B. barbata examined by Matthias (1914), who had specimens from 

 the Mediterranean. B. {Barbatia) barbata (Linne) occurs only in the 

 Mediterranean. Several authors, however, have reported it from the 

 Caribbean, e.g., Sheldon (1916), who gives some illustrations of "Bar- 

 batia barbata" from the West Indies (PI, 2, figs. 5-7). Reinhart (1935, 

 p. 25-26) did not recognize Sheldon's species, but said it must belong to 

 the subgenus Obliquarca Sacco 1898 or at least to a closely related 

 group, because of the arrangement of the ligament in Sheldon's figure 

 7. This may be the same condition found in B. {Cucullaearca) reeveana 

 (Orbigny) (see PI. 11, fig. 5b), small specimens of which have the liga- 

 ment only behind the umbones, although it occupies the whole cardinal 

 area in adult specimens. 



Barbatia (Barbatia) lurida (Sowerby) 1833 

 PI. 11, figs. 3 a-b; text-figs. 81 a-c 



Byssoarca lurida Sowerby, Proc. Zool. Soc. London, 1833, p. 19. 

 Syn.: fByssoarca vespertilio Carpenter 1856. 



fByssoarca fusca Carpenter 1856. 



fBarbatia solidula Dunker 1868. 

 Type loc: Santa Elena, Ecuador; 12 fms; attached to stones, rocky 



ground. {Byssoarca vespertilio: WLazatlan, yiexico) 

 Holotype: British Museum? 



Remarks: Byssoarca vespertilio Carpenter is quite probably a synonym 

 of Barbatia lurida (see discussion by Maury, 1922, pp. 12-13, and 



