ARGONAUTA. 139 



orange-colored animal, finely sprinkled with purplish dots, the 

 arms 1, 2. 4, 3 ; the web extends along only one-half of the 

 fourth pair, and is proportionally shorter than in A. Argo ; 

 there is also a slight difference in the arrangement of the lingual 

 denticles; the shell is stated to be more ventricose with a dif- 

 ferent arrangement of sculpture and tubercles. Finally Reeve's 

 tig. 2 c. (fig. 121) is referred to doubtfully as an illustration. 

 The Museum of the Academy possesses a specimen from Cumaiia, 

 precisely like the above-cited figure (which represents a shell 

 from the same locality), and which is assuredly A. Argo. 



Mr. Dall calls his second species A. expansa, and cites the 

 Gulf of California as locality. II o appears to have seen but a 

 single specimen, which he describes as differing from A. Pacifioa 

 in having ears or lateral expansions, and in sculpture. The 

 Museum of the Academy possesses a specimen collected by 

 \V . M. Gabb at San Pedro, Cal. (tig. 120), which answers well 

 to Mr* Dall's description, but is not separable from usual eared 

 forms of A. Argo. 



The I udo-Pacific A. compresxa, HI. (A. maxima, Gualt.), some- 

 times attains a considerable si/e. 



I figure the Mediterranean or typical A. Argo, the auriculed 

 A. compressa, the agglutinated A. papyria and the A. Argo of 

 Reeve, fig. 2 c.. which may represent A. Pacified. 



A.".FiiA(iiLis. Parkinson. 



Shell with numerous milk-white spots. Sinus large, furnished 

 with a callus, which is attenuated towards the edge of the lip, 

 and is carried across the base of the aperture from one sinus to 

 the opposite, in a flattened arch ; upon this arch rests one side 

 of the nucleus of the shell ; which is not involuted like other 

 species, but rises in a cylindrical form, a half-inch above the 

 arch from which the inner side springs. Around this cylinder 

 are a number of lines of growth; but it is not tubercled, and 

 has the shape of the end of the finger of a glove. 



In other respects this specimen answers to the description of 

 A. Argo. I believe it to be a pathological specimen of that 

 species. Many individuals of A. Argo show the milk-white spots 



given as one of the specific characters. 



No locality. 



