A. E. Verrill — North American Cephalopods. 207 



inches of the anterior end, from close to the extreme tip backward ; 

 the second section includes about uine inches, belonging to the ante- 

 rior portion, and extends to about twenty-five inches from the ante- 

 rior end, but lacks the extreme lateral margins, outside the costse 

 (Plate XV, fig. 3) ; the third section consists of about 7 -5 inches 

 belonging to the middle region, but does not include the whole width 

 on either side of the midrib; the fourth section is about 10 inches in 

 length, and comes from close to the posterior end, apparently repre- 

 senting nearly the whole width, on both sides. 



From these fragments we can restore, pretty accurately, the first 

 twenty-five inches, and the last twelve inches or more, though the 

 precise form of the indefinite posterior margin must remain doubtful. 

 The extreme anterior tip is broken off", but it was evidently pointed 

 and pen-shaped, as in Loligo. At the mutilated end the breadth is 

 now about a third of an inch. From this point the lateral edo-es 

 diverge rapidly with a slightly concave outline, for about 1'25 inches 

 where the breadth becomes 1*20 inches; beyond this the maro-ins are 

 nearly straight and diverge gradually to the end of the first section 

 at eleven inches from the tip. At this place the breadth is 3-10 

 inches, the marginal portions, outside of the lateral costfe, beino- 

 about '-to of an inch, and the midrib about "25 of an inch broad. 

 Beyond this point a section about 4-75 inches long is entirely want- 

 ing, and the succeeding section lacks the marginal portions, the late- 

 ral costje forming the margins on both sides. At 19-50 inches from 

 the tip, the breadth, between the lateral costjie, is 3*75 inches; at 25 

 inches it is 5 inches broad. Whether the marginal portions origin- 

 ally extended to this point with a breadth as great as they have at 

 11 inches is uncertain, for their breadth decreases backward to that 

 point from a point about 4 inches from the tip, where their breadth 

 is 60 of an inch. The midrib is strongly marked, being raised into 

 a semi-cylindrical form, and of somewhat thicker material than the 

 lateral portions.; its breadth and height steadily increases throuohout 

 both these sections and the following one, until it becomes nearly 

 half an inch broad, but in the section from near the posterior end it 

 is low and narrow and decreases rapidly toward the end. The 

 lateral costae are well-marked, considerably elevated, and well 

 rounded ; they run, at first, close to and nearly parallel with the mid- 

 rib, but after the first three inches they diverge quite regularly to the 

 point, at 25 inches from the end, beyond which we cannot trace them 

 until they reappear in the first part of the posterior section. Avhere 

 they are quite small and soon fade out entirely, at some distance ft-om 



