. A manual of zoology. 302 MANUAL OF ZOOLOGY lamellae. In Loligo1 (the squids) the shell (Fig. 187, B) is long, narrow, and completely horny; it corresponds to the pro-ostracum, the phragmocone being entirely Fig. 187. —Loljgo vulgaris. A, entire animal, dorsal view; B, horny internal shell or pen. (From Keferstein.) In Octopus the shell is represented only by a pair of rudiments with which muscles are connected. In Argonauta there is no shell in the male, but the female has an external shell (Fig. 188) of a remarkable character. This is a deli- 1 Our common American species is Loligo
. A manual of zoology. 302 MANUAL OF ZOOLOGY lamellae. In Loligo1 (the squids) the shell (Fig. 187, B) is long, narrow, and completely horny; it corresponds to the pro-ostracum, the phragmocone being entirely Fig. 187. —Loljgo vulgaris. A, entire animal, dorsal view; B, horny internal shell or pen. (From Keferstein.) In Octopus the shell is represented only by a pair of rudiments with which muscles are connected. In Argonauta there is no shell in the male, but the female has an external shell (Fig. 188) of a remarkable character. This is a deli- 1 Our common American species is Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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