DALL: MOLLUSCA AND BRACHIOPODA. 229 
Indo Pacific, Moluccas, New Zealand. This at first sight looks very different 
from the simple zodosa, but there are intermediate phases. 
G.1. A. navicula Solander, Portland Cat., 1786, p. 44, no. 1055; after Rumphius, 
Amboin. Rariteitk., pl. 18, fig. 4; + A. nittda Lamarck, An. s. Vert., 1822, 
7, p. 658 (syn. excl.) ; + A. owent Adams and Reeve, Zool. Voy. Samarang, 
Moll., 1850, p. 4, pl. 3, figs. la-1d; + A. kochiana Dunker, Zeitschr. Mal., 
May, 1852, p. 49; Novit. Conch., Moll. Marina, 1858, p. 29, pl. 9, figs. 7, 8; 
+ A. polita Conrad, Journ. Acad. Nat. Sci. Phila., 1854, 2d ser., 2, p. 333, 
pl. 34, fig. 4. Antilles, South Atlantic, Indo Pacific region. 
Even this polished species will show traces of granulation between the ribs in 
some specimens. Lamarck’s synonyms include the auriculate form, but in his 
diagnosis he mentions that his shell is not auriculate. 
G. 2. A. hians Solander, Portland Cat., 1786, p. 44, no. 1055; after Rumphius, Am- 
boin. Rariteitk., pl. 18, fig. B; + <A. gondola et hians Dillwyn, Rec. Shells, 
1817, 1, pp. 3834, 385; + A. raricostata Leach, Phil. Trans., 1817, p. 296, 
pl. 11, fide Blainville, Dict. Sci. Nat., 1826, 43, p. 218;+ A. hians Adams and 
Reeve, Zool. Voy. Samarang, Moll., 1850, p. 4, pl. 3, figs 2a-2c ; + A. crassv- 
costa Blainville, op. cit. (young shell), p. 218. Antilles, South Atlantic, Indo 
Pacific region. 
H. A. boettgeri Maltzan, Journ. de Conchyl., 1881, 29, p. 163, pl. 9, fig. 7; Smith 
Ann. Mag. N. Hist., 1887, 4th ser., 20, p. 409, pl. 17, figs. 1-6. Indo Pacific 
region, China Seas, Chagos Islands, Mauritius, Australia. 
A small, closely rolled, inauriculate brown species, quite distinct in character. 
I.1. A. fragilis Parkinson, Proc. Boston Soc. N. Hist., Aug., 1856, 5, p. 387. 
Locality unknown. 
After a careful examination of the description of this unfigured species, I am 
inclined to believe it based on an abnormal specimen. 
1.2. <A. geniculata Gould, Wilkes Exploring Expedition, Moll. and shells, 1852, 
p- 470, pl. 45, figs. 585 a-c; Otia Conch., 1862, p. 281. Rio Janeiro. 
This name is based on the animal of an Argonaut taken without the shell and 
fully figured in the report. 
I. 3. A. rufa Owen, name only, Trans. Zool. Soc. Lond., 1836, 2, p. 114; Gray 
Cat. Moll. Brit. Mus., Ceph., 1849, p. 84. South Pacific. 
The only description of this alleged species is comprised in the five words 
“animal and shell thick, red,” in Gray’s catalogue. 
J. 4. A. conradi Parkinson, op. cit., 1856, p. 386. ‘New Nantucket,” Pacific 
Ocean. 
The description of this small and unfigured shell reads as if it might relate to a 
variety or mutation of 4. dispar Conrad. 
