A. E. Verrill — North American Cephalopods. 185 



specimen :* one showing tlie entire body, somewhat mutilated anteri- 

 orly ; tbe other showing the head with the ten arms attached (plate 

 XIII). The body or mantle of this specimen was abont seven feet 

 long, and between five and six feet in circumference ; the relatively 

 small caudal fin was arrow-shaped and twenty-two inches broad, but 

 short, thick, and very pointed at the end ; the two long tentacular- 

 arms were twenty-four feet in length, and two and a half inches in 

 circumference, except at the broader part near the end ; the largest 

 suckers, which form two regular alternating rows, of twelve each, 

 were 1"25 inches in diameter, with serrated edges. There is also an 

 outer row of much smaller suckers, alternating with the large ones, on 

 each margin ; the terminal part is thickly covered with small ser- 

 rated suckers; and numerous small suckers and tubercles are crowded 

 on that portion of the arms where the enlargement begins, before the 

 commencement of the rows of large suckers. The arrangement of 

 the suckers is nearly the same as on the long arm of No. 2, but in the 

 latter the terminal portion of the arm, beyond the large suckers, as 

 shown in the photographs, is not so long, tapering, and acute, but 

 this may be due to the different conditions of the two specimens. 

 The eight short arms were each six feet long ; the two largest were 

 ten inches in circumference at base ; the others were 9, 8 and 7 inches. 

 These short arms taper to slender acute tips, and each bears about 

 100 large, oblique suckers, with serrated margins. 



The portions of the pen in my possession belong mostly to the two 

 ends, with fragments from the middle region, so that although 

 neither the actual length nor the greatest breadth can be given, we 

 can yet judge very well what its general form and character must 

 have been. It was a bi'oad and thin structure, of a yellowish brown 

 color, and translucent. Its anterior portion (plate XV, fig. 3) resem- 

 bles that of Loligo, but its posterior termination is entirely different, 

 for instead of having a regular lanceolate form, tapering to a point at 



the figure were restored as in Loligo. Subsequent studies and additional specimens 

 show that this genus is closely allied to Ommasirephes. Therefore, the head would 

 have been more correctly shown had it been restored with reference to that genusi 

 which has been done in this paper. The most obvious difference is in the eyes, which 

 have distinct lids and an anterior sinus. 



* Cuts made from these photographs have been published in several magazines and 

 newspapers, but they have been engraved with too little attention to details to be of 

 much use in the discrimination of specific differences. I have, therefore, prepared 

 new figm-es from these photographs with the greatest care possible. These figures 

 are particularly valuable, as showing the arrangements of the suckers on the short 

 arms. 



Trans. Coxx. Acad., Yol. V. 24 December, 1879, 



