no. 1704. 
EKG, il, 
Fia 1 
A COLLECTION OF SHELLS FROM PHERU—DALL. 
EXPLANATION OF PLATES. 
PuaTE 20. 
Polypus fontaineanus Orbigny, length 25 cm., see.....-..----------- 
PLATE 21. 
PEOUGOROU MOL DIony Len et its0) Cutest. meee a= 2 eens sleln s alolsie 
2. Endostyle of the same. 
Hires il 
2 
3 
4 
Enea 
2,5 
3 
4 
6 
7 
8 
Fie. 1,2 
3,7 
4 
5,6 
Fie 1 
2 
B 
4 
5, 6, 7 
8 
9 
10 
Fig. 
QO or & Nr 
. Acanthopleura echinata Barnes, natural size, from above 
. Acmea viridula Lamarck, natural size 
. Megatebennus cokeri Dall, length 27.5 mm 
. Tegula atra Lesson, aeons BIZ yes Siecle Shak ONO Le ropes 
. Missurella crassa Lamarck, interior and profile; length 50: mm 
. Iphigenia altior Sowerby, natural size 
. Arca (Anadara) grandis Broderip and Sowerby, umbonal view, 
. The same, in profile 
PLATE 22: 
. Concholepas concholepas Bruguiére, natural size_...-..----.---------- 
, Wrens erocoloias IDOCKOS|, Te IRA Ao oo occ tos eseaekdeaesuaeuoceen 
E Sulenosicinanjustonms): blainville natural size;22. 22.02 5.0220) eos 2 
Sehions OSG utOrnes DUCOS MaAlUne ly SIZC se cme ees yee sae els Sao 
PLATE 23. 
. Trochita trochiformis Gmelin, natural size, from above.-.-......---- 
WCrepmiaulaionyesowerby, natunalysize) os ass cease sees aes tees 
. Bulimulus cokerianus Dall; height 27 mm 
. Oliva peruviana Lamarck, showing animal as contracted by alcohol, 
with the ‘‘ pocket’ at the posterior end of the foot turned inside 
svliittorinaperwmand Lamarck, 2 natural size... 02...---52222.-22222- 
. Enoplochiton niger Barnes, natural size, from above 
PLATE 24, 
IPTATE! 25. 
Mails chomismNlolinasrssMatUnalustZe ssi )2) clan ski eiee tae ee 
. Palette of Yylotrya dryas, inside view, ? 
. Palette of Xylotrya dryas, outside view, 2? 
. Mytilus magellanicus Lamarck, % natural size.---.---25.-22.2 2.222: 
. Xylotrya dryas Dall; 6, outside of left valve; 5, interior of the two 
valves conjoined; 7, interior of left valve, natural size 
natural size, of an adolescent specimen 
PLATE 26. 
. Ostrea chilensis Philippi, interior of attached valve, 4 natural size... 
. Ostrea columbiensis Hanley, interior of attached valve, natural size -. 
. Anomalocardia subrugosa Sowerby, natural size 
. Cyrena isocardioides Deshayes, natural size.........----.-.--.-.--- 
. Pecten purpuratus Lamarck, + natural size 
. Pecten purpuratus, part of the external sculpture, much enlarged... 
293 
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