MAZATLAN UNIVALVES 203 



4-263. ACM.EA MESOLEUCA, Mice* 



A. t. "Acmceis patince et testudinali" simili ; tenui, subdia- 

 phana, rarius solidiore : extus, apicem versus Icevi, postea lirulis 

 tenuibus subdistantibus irregularibus ornatd, scepe minutissime 

 granulatis, interdum crassioribus, appropinqiiantibus ; fusco- 

 olivaced, interdum fused, rarius* nigro-fuscd ; varie tessellatd, 

 lineatd sen maculatd, interdum unicolore : intus, margihe fusco 

 et albido, seu nigro-fusco ; medio plus minusve viridi, seu albido- 

 viridi, interdum Jlavescente seu fiavido-viridi ; spathuld fused, 

 seu fuseo-olivaced, capite subtriangulari, corpore interdum ir- 

 regulariter pectinato. 



Mice, in Zeit.f. Mai. 1851, p. 38, no. 135, (diagn. supra auct.) 

 ? + A. mutabilis, pars, Mke. loc. cit. p. 37, no. 133. 

 = Patella diaphana, Eve. Conch. Ic. pi. 24, sp. 61, f. 61, a, b, 1854. 

 ? = Patella diaphana, Nutt. in Jays Cat. no. 2813, (sine diagn.) 

 ?=Lottia patina? C. B. Ad. Pan. Shells, p. 241, no. 367 (non 



A. patina, Esch.) 

 Pars ? = Patella (Acmsea ?) personoides, Midd. Mai. Ros. pt. ii. 



p. 37, no. 10, pi. 1, f. 2, 1849 : (=A. ancyloides, Mid, olim, 



non Propilidium ancyloide, Forbes.) 

 Var. ? = Patella (Acmsea?) seruginosa, Mid. Bui. Acad. St. Pet. 



vol. vi. no. 20: Mai. Eos. pt, ii. p. 38, no. 11, pi. 1, f. 1. 

 = Lottia pintadina (pars) Gould Exp. Shells, 1846, p. 9. 

 Comp. Patella floccata, Rve. Conch. Ic. 



vesper tina, Rve. loc. cit. pi. 26, f. 67, a, b. 



,, Cumingii, Rve. loc. cit. pi. 16, f. 37, a, b. 



Var. = Patella striata, Rve. loc. 'cit. pi. 33, f. 99, a, b.: (non 



Patelloida striata, Quo?/ fy G-aim. Voy. Astr. Moll. pi. 71, 



f. 811 : Rye. Conch. Ic. sp. 58.) 

 = Acmsea Antillarum, P. P. C. Cat. prim.: non Sow. (=A. 



testudinalis, teste Grould Inv. Mass.) 

 = Acmsea 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, leucophaea and scabra, Rve., with A. mesoleuca and iascicularis, 

 Mke. If one or both of Middendorff's species should prove identical with the 

 Mazatlan species, the name A. personoides shoujd 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. 



