DALL: MOLLUSCA AND BRACHIOPODA. 221 
This indicates the existence of eight well-defined species of Argonauta, four of 
which are known to have both auriculate and simple forms or varieties. 
The data are yet insufficient to formulate the range of distribution of any of the 
Species, but they show that several of the species are apparently limited in their 
range, two species being known from the Gulf of Panama which are unknown 
from the Caribbean Sea or the Atlantic Ocean, 
NOTES ON THE SUMMARY. 
The granulation of the surface is not a specific character in Argonauta ; all the 
Species show granulation occasionally, though with some it is more conspicuous 
and constant than with others. 
By carefully tracing back the early names, which were nearly all based on still 
earlier figures, I have been able to determine to which phase, auriculate or simple, 
sach name applies, whieh necessitates some changes from the usage current in 
most Argonaut literature. For the convenience of the student I have noted, 
under the letter and number of each name in the summary, the chief synonyms 
in the following paragraphs. It should be noted that young specimens of nearly 
all the larger forms are for a time distinetly auriculate, but may become simple in 
the adult stage, The brown species, like 4. Azazs, are sometimes profusely polka- 
dotted with small round white spots resident in the shell itself and not in the 
periostracum, 
A. A. grandiformis Perry, Conch., 1811, pl. 42, fig. 4. Cape of Good Hope. This 
is A. compressa Blainville, Dict. Sci. Nat., 1826, 43, p. 212, and A. maxima of 
some authors, both based on the Cymbium maximum striatum, etc., of Gualtieri, 
1742, pl.11, fig. A. So far as I have observed, none of the very large speci- 
mens is auriculate. 
. A. papyria Conrad, Journ. Acad. Nat. Sci. Phila., 1854, n. s., 2, p. 831, pl. 34, 
fig. 1; and A. argo agglutinans Martens, Ann. Mag. N. Hist., 1867, 3d ser., 
20, p. 106. The locality is not known, but 1 suspect the closing up of the 
lateral sinuses is really an abnormality. 
B. 2, A. cygnus Monterosato, Journ. de Conchyl., 1889, 37, p. 120. Mediterranean 
and Caribbean seas, This is the forma obtusangula of von Martens. 
. A. argo (Linné, 1758, ex parte) Bolten, Mus. Bolt., 1798, p. 70, no. 905; 4- 
A. sulcata Lamarck, Syst. An. s. Vert.. 1801, p. 99; + A. papyracea Link, 
Beschr. Rostock Samml., 1807, p. 85 ; + A. argo Lamarck, An. s. Vert., 1822, 7, 
p. 652; Blainville, Diet. Sci. Nat., 1826, 43, p. 212 (after Cymbium tenue Gual- 
tieri, 1742); + A. haustrum Dillwyn, Rec. Shells, 1817, 1, p. 335 (testa 
junior); + A. naviformis Conrad, Journ. Acad. Nat. Sci. Phila., 1864, 2d 
ser, 2, p. 994. Mediterranean. 
= 
ES 
B. 
e 
The Mediterranean form was early selected from amongst the heterogeneous 
assembly contained in the Argonauta argo of Linné and the older authors. Mar- 
tini’s figure 157, referred to by Bolten, shows only moderate auriculation, which is 
