140 ARGONAUTA. 



3. Form of A. nodosa. 

 A. NOUOSA. Solander. PI. 50, fig. 124. 



Animal. K>dy acuminated behind; arms more webbed below 

 than above, unequal; in the following order 1, 2, 4, 3; the sec- 

 ond and third pairs keeled on the outer side ; the second pair 

 depressed. 



Shell compressed, thin; sides with transverse 1 ruga?, broken 

 up into tubercles; tubercles of the keels rather sharp, elevated, 

 and sometimes laterally compressed; margin with a spine or 

 " ear " on either side. 



A specimen in Coll. A. N. S. is of the form obtuaangula, but 

 the ear is usually well developed. The sides of this species are 

 more convex and the back broader than in A. Argo. 



Brazil, New Zealand, Indian Ocean, Cape of Good Hope.* 



A. UENICULA, Gould. PI. 50, fig. 125. 



Described from a single specimen obtained with a seine at 

 Rio Janeiro. It was a female of rather large size, being six 

 inches long, but without a shell. It differs from A. Argo in the 

 web between the upper and lower pairs of arms being more 

 distinct, the dotting of the surface finer, the vela more elongated 

 with tiie surrounding cupnles much less definite and extensive. 

 From A. tuber culata (nodosa), it differs in having a much longer 

 siphon, a greater number of cupnles and different formed vela. 

 The first pair of arms are described as having a joint-like 

 llextire (probably accidental), and the general color is greenish, 

 with chocolate spots surrounded with golden green annuli. 



Brazil. 



\. IM FA. Owen, has not been characterized sufficiently to assign 

 it a place among admitted species. 



S. Pacific Ocean. 



<)< YTHOE PUNCTATA, Say, is described from a single specimen 

 wit.li its shell found in the stomach of a dolphin, and said to be 

 preserved in the collection of the Academy at Philadelphia. 

 The specimen is no longer extant, and Mr. Say believing the 



A specimen with animal, alive, and another specimen of the shell, 

 in perfect condition, came ashore on the New Jersey Coast in 1876 and 

 1877. LOCK WOOD, in American Naturalist. 



