MAZATLAN UNIVALVES 205 
263. AcMEA MESOLEUCA, MWke.* 
A. t. “Acmeis patine et testudinali” simili ; tenui, subdia- 
phana, rarius solidiore : extus, apicem versus levi, postea lirulis 
tenuibus subdistantibus irregularibus ornatd, sepe minutissime 
granulatis, interdum crassioribus, appropinquantibus ; fusco- 
olivacea, interdum fuscé, rarius nigro-fuscd ; varie tessellata, 
lineata seu maculata, interdum unicolore : intus, margine fusco 
et albido, seu nigro-fusco ; medio plus minusve viridi, seu albido- 
viridi, interdum flavescente seu flavido-viridi ; spathuld fused, 
seu fusco-olivaced, capite subtriangulari, corpore interduin ir- 
regulariter pectinato. 
Mike. in Zeit. f. Mal. 1851, p. 38, no. 135, (diagn. supra auct.) 
?+A. mutabilis, pars, Whe. loc. cit. p. 37, no. 133. 
= Patella diaphana, Rve. Conch. Ic. pl. 24, sp. 61, f. 61, a, b, 1854. 
?= Patella diaphana, Nutt. in Jay’s Cat. no. 2813, (sine diagn.) 
?=TLottia patina? C. B. Ad. Pan. Shells, p. 241, no. 367 (non 
A. patina, sch.) 
Pars ?= Patella (Acmea?) personoides, Midd. Mal. Ros. pt. ii. 
p. 37, no. 10, pl. 1, f. 2, 1849 :—(=A. ancyloides, Wd, olim, 
non Propilidium ancyloide, Forbes.) 
Var. ?= Patella (Acmea?) eruginosa, Mid. Bul. Acad. St. Pet. 
vol. vi. no. 20:—Mal. Ros. pt, u. p. 38, no. 11, pl. 1, f.1. 
= Lottia pintadina (pars) Gould Exp. Shells, 1846, p. 9. 
Comp. Patella floccata, Rve. Conch. Ic. 
i »  vespertina, Ave. loc. cit. pl. 26, f. 67, a, 8. 
a » Cumingii, Ave. loc. cit. pl. 16, f. 37, a, b. 
Var.= Patella striata, Rve. loc. ‘cit. pl. 33, f. 99, a, 6.: (non 
Patelloida striata, Quoy & Gaim. Voy. Astr. Moll. pl. 71, 
f. 8—11 :—Rve. Conch. Ic. sp. 58.) 
=Acmea Antillarum, P. P. C. Cat. prim.: non Sow. (=A. 
testudinalis, teste Gould Inv. Mass.) 
—Acmea patina, P. P. C. Cat. prov. (non Esch.) 
* It is difficult to say which name should be retained for this species. It is 
figured as P. diaphana by Reeve, the name having been received by Mr. Cuming 
from Jay as of Nuttall. Mr. Nuttall’s own specimens however of the green lim- 
pet are from Mazatlan, nor does he remember taking them in California ; and 
it is probable that he gave the name to the parallel variety of A. patina, to which 
the green shells brought by Hinds, Kellett, &c. were affiliated. At any rate it 
can only claim priority from the date of its appearance in Reeve. Gould’s name 
would have been retained, but that unfortunately his type specimens consist of 
P. verriculata, leucophzea and scabra, Rve., with A. mesoleuca and fascicularis, 
Mzke. If one or both of Middendorff’s species should prove identical with the 
Mazatlan species, the name A. personoides should be retained: but even that 
author’s very copious descriptions do not allow us to speak with confidence, 
without a comparison of types. Under these circumstances, as Menke’s name, 
though given later, certainly represents the Mazatlan species in its usual state, 
it is thought best to retain it, 
