<NOTES ON OEGOl'SID CKPHALOPODS FOUND IN JAPAN. 



Fam. Thysanoteuthidae Keferstein 1866. 

 Genus Thysanoteuthis Troschel 1S57. 

 22. T/tyaa notent his rhombus Troschel 1S57. 



'? Sepioteuthis major, Gray 1828, p. 3, pi. iv, fig. 1. (fide Fér. et d'Orb.) Fer. et d'Orb. 



1835, p. 305, Sepioteuthis pl. vii, fig. 12. Gray 184g, p. 83. 



Thysanoteuthis rhombus, Troschel 1857, p. 70, pl. iv, fig. 12, pl. v, figs. 1-4. Messina (fide 



Pfefrer). Tryon 1879, p. 167. Weiss 1889, p. 91. Neapel. Jatta 1896, p. 56, 



pi. ix, figs. 1-13, textfig. 54. Neapel, Ischia, Pozzuoli Bay. Pfeffer igoo, p. 182. 



Pfeffer 1912, p. 523, pl. xxvii, figs. 24-37. Mediterranean Sea, Atlantic Oc. 

 Berry 1912a, p. 438. 



The present species had been included, by mistake of some authors, 

 in the Japanese fauna. However, the actual existence of the species in the 

 Japanese archipelago is proved by the following three specimens : 



i. One specimen, sex ?, caught by Mr. K. Aoki, off Atami, Sagami 

 Trov. Sept. 23, 1905 (Sci. Coll.). 



ii. One specimen, sex ?, caught by a fix-net on the coast of 



Namerikawa, Etchu Prov., Nov. 1908 (Fish Inst. Namerikawa). 

 iii. One Q specimen obtained at Usetsu, Noto (Agr. Coll.). 

 Principal measurements of the above specimens : 



Sp. No. 



i 



ii 



iii 



Dorsal length of mantle 



180 mm. 



685 mm. 



290 mm. 



Breadth of mantle 



54 » 



240 



90 „ 



Dorsal length of head 



45 » 



156 » 



60 ,. 



Breadth of head 



49 » 



185 



88 „ 



Length of fin 



175 » 



674 „ 



290 „ 



Breadth of fin altogether 



157 » 



637 » 



300 „ 



Length of first arm 



Left 

 62 mrr . 



Right 

 58 mm. 



Left Right 

 — mm. 150mm. 



Left Right 

 100 mm. 100 mm. 



„ „ second arm 



75 » 



77 » 



— 160 „ 



120 ., 120 ., 



„ „ third arm 



123 „ 



127 „ 



— 240 „ 



196 „ 186 „ 



„ „ fourth arm 



70 „ 



71 » 



— . .170 » 



106 „ 108 ,, 



Length of tentacle ... 



160 „ 



157 » 



— 500 „ 



235 „ 230 „ 



