96 AMERICAN JOURNAL 



distinct from the Mediterranean argo and also from the Indo- 

 Pacific A. maxima. The materials at my command have, how- 

 ever, been rather limited, and the press of other work has pre- 

 vented me from giving due attention to the subject. The animal 

 of the Californian species is orange, with a sprinkling of fine 

 purple dots, more crowded and larger on the back. The pro- 

 portions of the arms are different from those of the A. argo. 

 The first pair are a little the longest ; the second next in length, 

 while in A. argo they are the shortest; the third pair are the 

 shortest, and the fourth equal to the third. The web extends 

 along only one-half of the fourth pair, and is proportionately 

 smaller than in A. argo ; the siphon is shorter, with a blunt 

 elbow. The dentition also differs. The central tooth is propor- 

 tionately larger, much broader, and slightly convex in the mid- 

 dle line in front. The first lateral is smaller, and the inner 

 corner is produced into a denticle. The second lateral is pro- 

 portionately larger, and the third narrower and smaller than in 

 A. argo. The shell is more ventricose, and the arrangement of the 

 sculpture and tubercles is different from that of the Mediterra- 

 nean species. 



More material, however, is needed to complete the comparison 

 of the shells. I have no doubt that it will be found, as I have 

 shown in the case of other very distinct species, that each is 

 limited to its own zoological province. 



ONYCHOTEUTHLBvE. 

 ONYCHOTEUTHIS, Licht. 

 ONYCHOTEUTHIS ? LOBIPENNIS,. n. S. 



Body short and inflated, somewhat cup shaped. Ventral pos- 

 terior portion rounded and produced, giving the animal a decid- 

 edly pot-bellied appearance. Anterior portion slightly con- 

 stricted or concave behind the edge, which is oblique, roundly 

 excavated in front, and produced into a sharp point in the 

 median line behind. Back slightly keeled. Fins rounded ovate 

 on each side, not continuous around the posterior extremity, 

 which is produced into a conical point. Nuchal collar prominent, 

 keeled in the median line behind and on each side of the funnel ; 

 margin interrupted by the funnel, otherwise entire. Head 

 rather swollen. Eyes large, blue in life, with a black inner ring. 

 Color yellowish white, with brown ocellated spots on the back 

 and sides, and brown specks on the arms and head. Sessile 

 arms subequal, tentacular arms somewhat longer. Length of 

 pairs: i, # 8 ; ii, *9 ; iii, 1*3; iv, *9 ; v, "8 in. Length of back, 

 along dorsal keel, *7 ; do., on ventral surface, # 5 ; max. diam., 



