68 THE CONCHOLOGISTS”- EXCHANGE, 
appears to be intermediate between the Gibral- 
tar forms and the type. I, therefore, propose 
to classify the forms of P. Valenciennii as 
follows : 
Parmace‘la Valencienniz, W. and Van B., a. 
typica.—Keddish brown without markings. 
This appears to be identical with P. A/ogaznz, 
Bourg. (Palad.) 
P. Valencienntt, 6. punctulata. — Reddish- 
brown, mantle with small black spots. This 
is Hidalgo’s form, of which he gives an ac- 
curate colored figure. 
P. Valencienniti, c. maculata.—Gyround color, 
inclining more to orange ; mantle, with black 
spots and two black stripes converging to- 
ward its posterior end, Gibraltar and Van- 
gier, | liuhis'is) the 227. Valenctennii, Crosse, 
and the P. calyculata, WKobelt. I have 
shown (‘ Journ. Conch.”’) that Sowerby’s 2. 
calyculata differs from this in the character 
of the shell. 
P. Valenciennii ad. olivacea,—Similar to var. 
maculata, but ground color dark olive, rather 
lighter and somewhat mottled in young indi- 
viduals. Gibraltar and Tangier. 
CORRESPONDENCE. 
Editor THE CONCHOLOGISTS’ EXCHANGE: 
Siv:—Thinking it might be of interest to the 
readers of THE CONCHOLOGISTS’ EXCHANGE, I 
give you herewith the results of one hour and 
fifteen minutes’ collecting at a point on the 
coast of San Luis, Obispo County, six miles 
from Morro. 
Stenoradsia Magdalensis, Rve., 42 specimens 
Lschnochiton Coopert, Cpr., 17 ce 
Tonicella lineata, \Nood, I 
Mopatlia lignosa, Gld., I 66 
Crepidula navacelloides, Nutt., 23 “ 
Crepidula adunca, Sby., 28. aE 
Fissurella volcano, Rve , I c 
flaliotis rufescens, Swains, (young)2 “ 
Chlorostoma brunneum, Phil., numerous“ 
Chlorostoma funehrale, Adams, numerous‘ 
Amphissa corrugata, Rve, 6 specimens 
Drillia mesta, Cpr., 2 fe 
* Scalarta Hindst?, Cpr., 2 es 
Leptonyx bacula, Cpr., 2 oh 
Octnebra lurida, Midd., 2 specimens 
3 inter fossa, Cpr., 4 ee 
Bt circumtexta, Strns., 72 6c 
“e 6 (73 
Calhostoma costatum, Matt., 3 
Acmea asm, Midd., I ot 
They were all live specimens. I could have + 
filled a bushel measure with C. /frae- 
brale and C. brunneum. I collected C. brun- 
neum for the Crepidula adunca on them and 
for their large size I almost invariably find 
Crepidula adunca on Chlorostoma brunneum, 
and Acme@a asmi on Chlorostoma funebrale. 1 
carried the go Chitons home in the gallon 
milk can (mentioned in a former letter) and 
_ only threw away /wo that curled up and could 
not be straightened. 
G. W. MICHAEL, JR. 
Morro, Cal., Oct. 23, 1887. 
Editor THE CONCHOLOGISTS’ EXCHANGE : 
8] 
Strs 
tainly not Muller’s 2b7licatus, 
I therefore propose to call P. wmbrlicatus, 
Taylor (non Mull.) which is allied to 2. 
parvus, Say., by the name Planorbis umbilica- 
tellus. 
T. D. A. COCKERELL. 
West Cliff, Col., Oct. 27, 1887. 
STRIA. 
Herr Palisa, of Vienna, discovered a new 
planet, September 21st. It is Asteroid, No. 
2690. 
G. W. Drum, of San Francisco, a collector 
74 years of age, has just returned from New 
Mr. J. W. Taylor has described and 
figured (‘Journal of Conchology,” 1885, p.351) 
a new species of /Planorbis from Manitoba, 
which he proposed to call P. zbilicdtus, Vay- 
lor, The name has, however, been long pre- 
occupied by Muller fora European species, 
which Jeffreys, and not English authors, have 
erroneously called P. complanatus, Lainn., 
Linne’s complanatus being more probably the 
species in England known as zzz¢2dus, and cer- 
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