A. E. Verrill — North American Cephalopods. 
429 
three ; the lateral ones are usually T-shaped, formed by a longitudinal 
ridge, with a smaller transverse one across its posterior end ; the 
corresponding cartilages on the siphon are long-triangular, wdth a 
longitudinal and a transverse groove. Two oviducts. Hectocotylized 
arm of the male may be either the right or left ventral. 
Pen usually very narrow along the middle portion, and with three 
ribs ; anterior and posterior portions expanded, the latter with the 
edges involute, and forming a terminal hood or hollow cone. 
Ommastrephes (See pp. 267, 385). 
Ommastrephes (pars) D’Orbigny, Vov. Am. Merid., 1835 ; Cephal. Acetab., p. 341. 
Illex and Todarodes Steenstrup, Oversigt k. Danske Yidenske. Selsk. Forhand., 1880, 
p. 90. 
2. Ommastrephes illecebrosus (Les.) Terrill. (pp. 268, 403). 
Sthenoteuthis Terrill. (See pp. 222, 286, 385, 402). 
Ommastrephes (pars) D’Orbigny, Voy. Amer. Merid., Moll.. (1835 ?) ; Cephal. Acetab., 
1839-48. 
Sthenoteuthis Terrill, Trans. Conn. Acad., vol. v, p. 222, Feb., 1860; Amer. Journ. 
Sci.. vol. xix, p. 289, April, 1880. 
Ommastrephes Steenstrup, Oversigt k. Danske Yidensk. Selsk. Forhandl., 1880, p. 
89 (sep. cop. p. 19, received Aug., 1880). 
3. Sthenoteuthis megaptera Terrill, (pp. 223, 286). 
Sthenoteuthis pteropus (Steenst.) Terrill, (pp. 228, 402). 
4. Sthenoteuthis Bartramii (Les.) Terrill, (p. 288). 
Architeuthis (Steenst.) Harting, 1881. (See pp. 197, 259, 394, 422). 
Architeuthus Steenst., 1856, (no description). 
5. Architeuthis Harveyi Terrill, (pp. 177-210, 259, 395, 422). 
6. Architeuthis princeps Terrill, (pp. 181-1 89, 194, 259). 
Architeuthis monachus (Steenst.) (pp. 2.38-245). 
Architeuthis dux (Steenst.) Gervais. (pp. 238-240). 
Architeuthis Hartingii Terrill, (p. 240). 
Architeuthis Bouyeri Terrill, (p. 243). 
Architeuthis (?) Mouchezi Yelain. (pp. 243, 398). 
Architeuthis grandis (Owen) Verrill. (p. 4<»0). 
