428 A. E. Verrill — North American Cephalopods. 



For a brief synopsis of the previously known genera of this fam- 

 ily,* see pp. 250, 251. 



Owen's family, Teuthidce, included nearly all the Decacera having 

 horny internal shells. As adopted by D'Orbigny, it included our 

 OmmastrephidcB and Teuthidm. 



Enoploteuthis (see pp. 251, 404). 



Enoploteuthis Hartingii Terriu. ([.p. 240, 24i, 404). 



Enoploteuthis Molinas D'Orb. = E. Cookii Owen. (pp. 24l, 404). 



Moroteuthis TerriU. (See p. 393). 

 Moroteuthis robusta (Dall) Ven-ill. (pp. 246, 393). 



GonatUS Gray. (See pp. 290, 387, 390). 



Gonatus amoenus Gray. (pp. 291, 388, 390). 



LestOteuthis Yerrill. (See pp. 250, 387, 390). 

 1. LestOteuthis Fabricii (Lieht.) Yerrill (pp. 291, 293, 387-390). 



Family OMMASTREPHID^. 



Teuthidm {j)ars) D'Orbig.. Ceplial. Acetab., pp. xxxvii, 328. 

 Onychoteuthidoi {2)ars) Gray, Catal. Brit. Mus., Moll., vol. i, p. 45, 1849. 

 OminastreplndK Gill, Classification Mollusca, p. 1, 1871. 

 Trjou, Man. Conch., vol. i, p. 107, 1879. 



Body elongated, often very large (Arehiteuth/s), tapering to a point 

 posteriorly, shorter and less acute in the female. Sessile and tentacu- 

 lar arras without hooks, but provided with suckers, having denticu- 

 lated, horny rings ; tentacular arras with an expanded club, having 

 four rows of suckers on its middle portion, those in the two central 

 rows lai'ger; proximal portion mth or without smooth-rimraed con- 

 nective suckers and tubercles ; tip with a cluster of smooth-rimmed 

 suckers. Siphon in a deep groove, attached by four bridles ; an internal 

 valve. Eye-lids with a distinct anterior sinus. Nuchal and olfactory 

 crests consist of three longitudinal membranes on each side, united 

 by a transverse one in front. Connective cartilages of the mantle 



* The genus Dosidicus Steenst., should not have been there included. It belongs to 

 the OmmastrephidiH, and is very closely related to Stheiioleuthis. The tentacular club 

 bears denticulated sucivers and the terminal cone of the pen is hollow. 



Aiicistroteuthis Krohnii appears to belong to Onychoteuthis. Gonatus and LestoteuUiis 

 have since been restricted and their characters revised. (See pp. 388-394). 



