1912.] NATURAL SCIENCES OF PHILADELPHIA. 397 



[Polypus membranaceus (Quoy and Gaimard, 1832).] 



Octopus membranaceus Quoy and Gaimard, 1832, p. 89, pi. 6, fig. 5. 

 Octopus tin inbranaeeus d'Orbigny and Ferussac, 1838, p. 43, Poulpes, pis. 



10, 28 (fide d'Orbigny). 



Octopus membranaceus d'Orbigny, 1845, p. 181. 

 Octopus membranaceus Gray, 1849, p. 13. 



Octopus membranaceus Tryon, 1879, p. 124, pi. 28, figs. 20, 21. 

 Amphioctopus membranaceus Fischer, 1882, p. 333. 

 Octopus membranaceus Brock, 1887, pp. 609, 612. 

 Octopus membranaceus Ortmann, 1888, p. 662 (mere note). 

 Octopus areolatus Joubin (pars), -1894, p. 28. 



Reported from Japan by Tryon, who included with this species 

 as synonyms the 0. ocellatus and 0. sinensis of d'Orbigny. The 

 occurrence of undoubted membranaceus in this region needs con- 

 firmation. 



Family AMPHITRETID^J Hoyle, 1886. 



Genus AMPHITRETUS Hoyle, 1885. 

 Amphitretus pelagicus Hoyle, 1885. 



Amphitretus pelagicus Hoyle, 1885, p. 271, fig. 106. 



Amphitretus pelagicus Hoyle, 1885o, p. 235. 



Amphitretus pelagicus Hoyle, 1885c, p. 113, fig. 



Amphitretus pelagicus Hoyle, 1886, pp. 4, 67, etc., pi. 9, figs. 7-9. 



Amphitretus pelagicus Ijinia and Ikeda, 1902, pp. 85-101, text figs. 1-3, pi. 2. 



Distribution. Okinose Bank, near Misaki, Sagami (Ijima and 

 Ikeda). Off the Kermadec Islands (type locality, Hoyle). 



Family ALLOPOSID^B Verrill, 1881. 



Genus ALLOPOSUS Verrill, 1881. 

 Alloposus pacificus Ijima, 1902. 



Alloposus pacificus Ijima in Ijima and Ikeda, 1902, p. 87, note. 

 A species not yet sufficiently characterized. 

 Distribution. Sagami Sea (type locality, Ijima). 



Sub-order DECAPODA Leach, 1818. 

 Division MYOPSIDA d'Orbigny, 1845. 

 Family LOLIG-INID^ Steenstrup, 1861. 



Genus LOLIGO Schneider, 1784. 



Among cephalopods only Polypus and Sepia exceed the wide- 

 spread genus Loligo, in the number of species known from Japanese 

 waters. The following species have been described or identified 

 from this region : 



L. edulis. L. sumatrensis. 



L. chinensis. L. japonica. 



L. kobiensis. L. tetradynamia. 



L. bleekeri. L. aspera. 



