LBGOK \ i 



orange-colored animal, finely sprinkled with purplish d<>t^. the 



:inns I. -J. I. :i ; the web extends almi-j >ulv mielnlf of t he 

 fourth i>:iir. and is proportionally shorter than in A. Ar</<>; 

 there is :ilso:i slight dilference in tin- arrangement <>f the lin^n.-il 

 dent ides ; the shell is stated to lie more veiitricose \\ith :i dif- 

 t'erent :i rr.'ininvmcnt of sculpture and tubercles. l-'inallv Re* 

 I'm'. -2 <. (fig. 1 -M ) is referred to doubt .fully a> :m illust rut ion. 

 The' Mu sen in of the Academy possesses :i specimen from ('11111:111:1. 

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

 from tlu- same locality), and which is assuredly A. Argn. 



Mr. Dull calls his second species A. t'.r/xtn*(i. and cites the 

 (Julf of ( 1 alifornia as locality. He appears to have >een but a 

 sino-le specimen, which lie describes as ditferiiiir from A. Pacifioa 

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

 Museum of the Academy possesses a specimen collected by 

 \V. M. Gal>!> tit San Pedro, Cal. (fig. 120), which answers well 

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

 forms of A. Argo. 



The Indo-Pacific A. compresm. HI. (A. maxima, Uualt.), Home- 

 times attains a considerable size. 



I figure the Mediterranean or typical A. Argo. the anricnled 

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

 Reeve, iig. "2 c.. which may represent A. Pacifica. 



A. FiiA<;ius. 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. \ believe it to be a pathological specimen of that 

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



i^iven as one of the specific characters. 



No locality. 



