A. E. Verrill — North American Cephalopods. 247 



somewhat I'aised. The iinehal collar is well-marked, and slightly 

 above it, on each side, is a raised epidermal ridge, from which three 

 wavy, raised bands or frills, attached at their inner edge, pass ob- 

 liquely backward, on each side. No cranial cartilage was observed. 

 Mantle firm and dense. The neck has one median dorsal and two 

 ventral facets, long, oval shaped, with a median dei^ressed line, but 

 otherwise smooth and white ; the dorsal moves on a smooth part of 

 the inside of the mantle; the ventrals move on similar raised facets 

 of the mantle beneath. The caudal fin was rather broad, lanceolate 

 or spear-shaped, acute at tip. Gills yellowish olive, with obliquely 

 transverse laminn?. Gizzard, yellowish, the muscles laid like a coil of 

 spun-yarn, in layers transverse to one another. 



The pen, (PI. XXIII, figs. 4, 5,) was gone from the first specimen 

 (No. 1) and broken in the others. It was found unattached, in the 

 dorsal cavity. It had a thickened median rib, but becomes very thin 

 at the sides, and is divided by sharp, stiff ribs or folds into three lon- 

 gitudinal areas, on each side (PI. XXIII, fig. 6). The posterior end 

 is one-sided, funnel-shaped close to the tip, which is inserted into a 

 long, round, thick, firm, cartilaginous cone, which tapers to a point 

 posteriorly. The portion of the pen (of No. 2) preserved* and for- 

 warded to me, includes all the cone and a part of the posterior end 

 of the quill-i)ortion, attached within the concavity of the cone (PI. 

 XXIY, fig. 7). The anterior end of the cone is concave and very ob- 

 liquelv terminated, the dorsal side expending forward some distance 

 along the dorsal side of the quill. The whole length of the preserved 

 cone, (doubtless much shrunken by the alcohol) is 44-5'^" (17*5 inches) ; 

 of the oblique anterior termination, 15 •25'='" (6 inches) ; greatest di- 

 ameter, 4'='" (re inches). The cone is nearly round, firm, translucent, 

 brownish, or deep amber-color, and composed of numerous distinct 

 concentric layers. The concavity of the anterior end firmly em- 

 braces the remnant of the funnel of the quill, which has numerous 

 small costoe converging to the apex ; two of the dorsal costal are 

 much stronger than the rest, forming a strong ridge each side of the 

 smaller median costa, which lies in a deep median depression or 

 furrow. 



The tentacular-arms had lost their clubs ; but the part remaining 

 was cylindrical, 2-5 inches in diameter. The other arms were some- 



* Mr. Dall states that he attempted to dry the rest of this pen, and that of No. 3, 

 but they turned brown, and then black, effloresced, and decomposed. He also states 

 that the pen, when fresh, was translucent whitish, and that it changed to brownish 

 yellow in the alcohol. 



