1 (II A.RGONA1 T.\. 



:'.. Form nf A. nodosa. 

 \. NODOSA, Solander. IM. .Ml. li-. 1 '24. 



Animal, body acuminated behind; arms more webbed below 

 than above. uiu'(|ii:il ; in the following order 1. '2. 4. .'5: the sec- 

 ond :ind third pairs keeled on the out er side ; t he second pair 



depressed. 



Shell compressed, thin: sides with transverse ru^e. broken 

 np into tubercles; tubercles of tin- keels rather sharp, elevated. 

 and sometimes laterally compressed; marir'ni with a spine or 

 " ear " on either side. 



A specimen in Coll. A. N. S. is of the form nhln*iiinju1a. but 

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

 more convex and the back broader than in A. Ar<j<>. 



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



A. (iKNici I.A. (Jould. IM. f)0. fi.ir. \'2:i. 



Described tVom a sin.ii'lc specimen ol>tained with a seine at 

 llio .Janeiro. It was a female of rather lai'LiV si/e. beiim six 

 inches loiio-. but without a shell. It ditl'ers from A. Argo in the 

 web between the upper and lower pairs of arms bein^r more 

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

 with the Surrounding cup llles much less definite and extensive. 

 I-' rom A. fuhrrrntntd (rtodoxa). it ditl'ers in IIM vini;- :i much longer 

 siphon, a greater numbei 1 of cupules and different formed vela. 

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

 flexure (probably accidental ). and the uvneral color is greenish, 

 with chocolate spots surrounded with golden u'reen annuli. 



Brazil 



A. it i r,\. Owen. h:is not been cha ra<-t eri/ed suflicieutly to 

 it a place :imoii'_i admitted s|>ecies. 



6'. Pacific Ocean. 



PUNOTATA, Say, i> described from a single s))eciinen 

 with its shell found in the siomach 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 >]ieciincii \\itli imiiiiaK ali\c. ;iii(l aiiolhcr specimen of 1 lie shell, 

 in perfect condition, Came ashore on the Mew Jersey ( 'oast in ISTfJand 

 LOCK-WOOD, in American Naturalist. 



