Sasaki : On a New Si'kcif.s of Oeuopsids from tuf. Bay of Toyama, Gonatl's SF.rTEMDENrATus. 1 87 



larger hooks, except at the proximal part as well as at the distal, there being 1/3-1/4 

 the length of each arm where only suckers are found (5 or 6 rows of suckers at the 

 extreme base of cacli arm followed by 20-27 hooks, the last row of hooks stopping 

 at the place 1/3 or 1/4 of the arm-length from the extremity). This number of 

 hooks shows some variation among different individuals as well as among the dif- 

 ferent arms of each individual. The distal half of the horny ring of each sucker has 

 about 10 sharp teeth, while the rest of the margin projects a little, showing a sickle- 

 shaped edge, the median part of which sometimes bends forwards. The teeth, trian- 

 gular in shape, laterally flattened are largest in the middle of the row. 



The tentacles show a great variation in length that is caused by the degree of 

 contraction, but seem about as long as the mantle, and the stalk is a little flattened 

 laterally, with a flat but narrow inner surface. The club comprises about 1/3 of the 

 whole length of the tentacle, and is expanded lanceolately, with an elongate terminal 

 portion ; and the web on the outer surface is well developed, becoming wider towards 

 the extremity and bending to the dorsal side distally. 



The tentacular suckers are more simple than those of Goiiatiis fabricii, the hooks 

 being entirely lacking in all the specimens which I examined. They are very 

 numerous, occupying the whole inner surface of the distal half of the tentacle, and 

 are equally minute, but tiiose of the median region are a little larger than the others. 

 In the specimen, of which the mantle-length is 164 mm, the series of the connective 

 suckers, (about 57 suckers alternating with the fixing warts of the same number), 

 begins at the extreme base of the sucker-bearing surface, and it runs along the dorsal 

 margin of the club, towards the extremity, and stops at a distal point leaving 1/3 of 

 the sucker-bearing surface ; the suckers farther distal of the connective ones along the 

 same margin are about 46 in number. The number of the suckers contained in each 

 transverse row in the same specimen is about 12 at the carpal portion, about 24 at 

 the widest hand-portion and about 6 at the slender distal portion. And, there is at 

 the extremity a circular series of 1 1 suckers. All these tentacular suckers are ob- 

 lique in shape like the arm-suckers, and the aperture is large. The horny rings 

 have, along about 4/5 of the circumference of the higher margin, long teeth such 

 as occurred in the arm-suckers, the number of the teeth being about 1 5 in the largest 

 sucker. 



The gladius resembles also that of Gonatns fabricii being provided with an 

 endocone at the posterior; but the wings have much longer extention than G. fabricii., 

 begin at the point of the anterior 1/5 of the whole length from the end. 



The whole outer surface of the mantle and head as well as the entire surface of 



