抄録
A new locality is found from Japan on the crab, Lithodes aequispina Benedict (1894). This crab has been taken from waters, 450〜740m in depth, off Shioyazaki, Fukushima Prefecture. The crab in question is characterized by the rostrum, which is armed with 9 (Fig. 1B) or 10 spines. Sometimes 3 spines are found on the dorsal surface of the rostrum, when the spines of the rostrum enumerate 10 spines in total number. The carapace furnished with 111〜161 acute short spines (Fig. 1A). This spines have a trend decreasing in number with growth. An individual, 85mm in carapace length, bears 161 spines, that, 112mm long, has 136 spines, and that, 160mm long, has 111 ones. In adult form, the width of the carapace is larger than the length of the carapace. This inclination seems to be a little more salient in male than in female as shown in the Table 1. The egg of this crab is comparatively lager, measuring ca. 1.1mm in longer diameter, ca. 0.9mm in shorter one. Fishery of this crab, in Iwaki city, Fukushima Pref., takes place during the months from December to September. Vigorous season ranges from January to March. Some females taken in March are found bearing eggs beneath abdomen. This crab is fished by using a cage about 45cm and 120cm in diameter of the mouth and the bottom respectively, about 58cm in height. Some fishes, such as scomber, saury, sardine, anchovy, and others are used for the bait.
