A. E. Verrill — N'orth American Ceplmlopods. 429 



three ; tlie 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, with 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, Voy. Am. Merid., 1835; Cephal. Acetab., p. 341. 

 lUex and Todarodes Steenstrup, Oversigt k. Danske Videnske. Selsk. Forliand., 1880, 

 p. 90. 



2. Ommastrephes illecebrostis (Les.) Vemii. (pp. 2G8, 403). 



Sthenoteuthis Von-ill. (See pp. 222, 28(J, 385, 402). 



Ommastrephes (pars) D'Orbigny, Voy. Anier. Merid., Mo)l.. (1835 ?) ; Cephal. Ac^tab., 



1839-'48. 

 Sthenoteuthis Verrill, Trans. Conn. Acad., vol. v, p. 222. l''eb., 1880; Amer. Journ. 



Sci.. vol. xix, p. 289, April, 1880. 

 Omraas/rtf^)/(es Steenstrup, Oversigt k. Danske Vidensk. Selsk. l"\irliandl., 1880, p. 



89 (sep. cop. p. 19, received Aug., 1880). 



3. Sthenoteuthis megaptera Verriu. (pp. 223, 28G). 



Sthenoteuthis pteropUS (Steenst.) Vernll. (pp. 228, 402). 



4. sthenoteuthis Bartramii (Les.) Verriii. (p. 288). 



ArchiteuthiS (Steenst.) Harting, 1881. (See pp. 197, 259, 394, 422). 

 Architeuthus Steenst., 1856, (no description). 



5. ArchiteuthiS Harveyi Verrill. (pp. 177-210, 259, 395, 422). 



6. ArchiteuthiS princeps Verrill. (pp. 1 8 1-1 89, 194, 259). 

 ArchiteuthiS monachus (Steenst.) (pp. 238-245). 



ArchiteuthiS dux (Steenst.) Gervais. (pp. 238-240). 



ArchiteuthiS Hartingii Verrill. (p. 240). 

 Arc'^^iteuthis Bouyeri Verriii. (p. 243). 

 ArchiteuthiS (?) Mouchezi Veiain. (pp. 243, 398). 



ArchiteuthiS grandiS (Owen) Verrill. (p. 400). 



