286 BOTAKY 01" THE VOYAGE OF U.M.S. HEUALD. 
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from naming, or inducing others to name, these eoUeetions, except \diere several specimens, or a perfectly 
new and reliable character, rendered hesitation unnecessary. Those few that are found elsewhere I have 
carefully pointed out ; many however are perfectly new, and quite unknown, except to Mr. Potts and my- 
self. I have nevertheless limited myself to ranging these plants in their proper places according to the 
elaborate and accurate system established by His Serene Highness Prince Joseph of Salm-Dyck, believing 
that this plan will be found quite sufBcient, with the descriptions added, to allow of every species being 
identified, should we be favoured with another supply from the same localities. The few species that 
have been named, generally with the kind assistance of His Serene Highness, have been so described, that 
all chance of synonymic confusion is obviated. Of those not named, if identified by others, it would be but 
a grateful testimony to the zealouB exertions of the collectors to insert, when finally described and named, 
the numbers here given. 
As connected with the voyage of the ' Herald,' it may be proper to add that ISIr. J. Goodridge, surgeon, 
found a MamilJana on the island of Cerros, east of California, which was by me forwarded to Prince Salm- 
Byck, unfortunately in a very imperfect state. It has been placed by him under his Mamillari(B hetero- 
cMoree, page 10 of his Enumeration, and is described by him as MamiUaria Goodridgii, Scheer, thus:— "M. 
caule erecto cylindraceo basi ramoso, axillis nudis, mamillis confertissimis parvulis viridibus, pulvillis nudis, 
aculeis exterioribus 12 diaphane albis rigidiusculis subtessari-patentissimis intertextis, ccntralibus 4 longiori- 
bus, basi albidis supcme brunneis, infimo validiore uncinato." The Prince seems to think that it approaches 
to M. Benechei, Ehronb., but that, on comparing the actual plants, does not appear to me to be the case. 
About Guaymas a MamiUaria somewhat similar to M. Gooclridgii was found, but more like a MamiUaria 
anguinea, with a central spine strong and hooked; also a very robust species o? Ma?}i ill aria sjyhacelata. 
221. Mamillaria Schelhasii, Pfr., S triuncinaia, Salna-Dyck, Cactese in Hort. Dyck. p. 81. Cult. 
a. 1849. 
Prince Salm-Dyck has named this plant from small seedlings ; but the origlna] plant (soon dead) bore 
no resemblance to M. Schelhasii, the external spines being hard of texture and closely adpressed to the 
body. None of my seedlings grew to any size, and Mr. Potts told me that he had not been able to pre- 
serve this plant long in cultivation, and that he found, in fact, the same difficulty with many other Cadets 
at Chihuahua. 
Hort. Dyck. p. 8. 
222. Mamillaria senilis, Lodd, S, D. p. 82. 
r 
Thia i^laut growa on the to^^s of muuutains near Chihuahua [and in the Sierra Madre, on rocks, See7n,}y 
and during winters is covered with snow- The plants all arrived dead. I have seedlings, hut they do not 
flourish under the influence of an EngHsh climate, 
H. D- p. 8, post Mamillariam Humholdtii- 
223. Mamillaria sawatilis, Scheer. 
This small plant grows in the crevices of rocks near Chihuahua, and is as difficult to see as to extract 
from its site. The Prince, to whom I sent one of two plants, soon dead, thought it to have great affinity 
with M. JlumloIJtii, which however grows in meadows near Guanajuato, and is described with " spinis 
niveis," whereas the present specimen was " M, eylindrica, aculeis eburneis quasi stramineia." Received 
1847. 
224. Mamillaria Leucodasys, S. D. in litem. Species distinctissinaa, sed eheu I eraortua, ut recte 
describi non possit. Planta parvula ovata 1 V'alta, apicc nmbillcato eaduco ruhro-barbato ; mamillis 
aculeisque minutissimis quasi velumino albo plantam occultantibus ; aculeis sub lente diaphaiio-albiSj 
reflexo-radiantibus, biscrialibus j scrie inferiori sub-16, superiori 8 brcvioribus. Received 1850. 
