NATURAL SCIENCES OP PHILADELPHIA. 61 



Calliostoma (?var.) variegatcm. 



C. t. parva, conica, variegata ; nucleo rosacco ; anfr. vi. planatis, suturis 

 haud iinpressis ; costulis in spira. iii. regularibus, nodulosis ; nodulis albidis, 

 subdistantibus ; interstitiis elegantissinie rosaceis ; lirulis basalibus viii. 

 haud nodulosis, rosaceo maculatis. Long. -24, long. spir. -13, lat. -21, div. 



50. 



Hab. Puget Sd., sp. un. legit Kennerley. 



This may prove to be an extreme variety of Cal. annulatum, Martyn. 



Margarita (?wz?\)tenuisculpta. 



M. t. " M. Vahlii" forma, colore, et operculo simillima; sed striulis spirali- 

 bus, plus minusve obsoletis cincta,, quarum iv.-vi. in spira, monstrantur. 

 Long. -22, long, spir. -11, lat. -13, div. 70. 



Hab. Puget Sd., Kennerley. Neeah Bay, Swan. 



Except in the very faint spiral sculpture, which does not always appear a 

 constant character in Margaritas (v. M. undulata in Fbs. and Hani. Br. Moll.,) 

 these shells might stand for M. Vahlii, a ? variety of which was found spar- 

 ingly by Dr. Kennerley. They are sometimes painted with infrasutural flam- 

 mules of darker ash. Both the smooth and the striated forms have a promi- 

 nent spiral rib on the whorls of the operculum. 



Margarita lirulata, n. s. 



M. t. parva, cineracea, tenui, tumentiore, nacreo rosaceo ; anfr. v. plerumque 

 subdepressis, suturis distinctis : interdum purpureo-fusco pallide maculata ; 

 lirulis acutfs spiralibus haud elevatis, supra valde distantibus, in spira ii., 

 circa basim rotundatum circ. viii. ; apertura subquadratu ; umbilico magno, 

 infundibuliformi,angulato ; interstitiis lirularum laevibus, seu ab incrementi9 

 epidermidis decussatis : operculo tenuissimo, pallido, subplanato, suturis dis- 

 tinctis. Long. -18, long. spir. '07, lat. -2, div. 80. 



Hab. Puget Sd., Kennerley. 



? Var. a. subelevata ; t. elatiore ; colore livido, intensiore ; lirulis vix 



acutis. 



Bab. Puget Sd., Kennerley. Neeah Bay, Swan. 



? Var. p. obsoleta ; t. ut in 1 \&v . subelevata ; lirulis evanescentibus ; oper- 

 culo planato, tenuissimo, suturis indistinctis. 



Hab. Neeah Bay, Swan. 



? Var. y. conica ; t. valde elevata ; lirulis acutis, aliis interdum intercalan- 

 tibus ; umbilico parvo. Long. -33, long. spir. -2, lat. -25, div. 58. 



Hab. Puget Sd., Kennerley, sp. un. 



The shells above described constitute what might be called a Darwinian 

 group of specific forms. With the exception of the typical shells dredged 

 by Dr. Kennerley, they are all in very bad condition. The Pugetian speci- 

 mens are flattened, with open umbilicus, as might be expected from quiet 

 water. Two specimens, however, form an exact transition to the Neeah Bay 

 shells, of which a fair number (var. a) were sent by Mr. Swan, though worn 

 and generally decorticated. They are more elevated, with fainter sculpture ; 

 and pass, by insensible gradations, into M. tenuisculpta, the two principal 

 spiral lines becoming evanescent, and a few others intercalating. In this 

 state (var. /?) the species can only be separated by the operculum, which is 

 pale and thin, and destitute of the strongly expressed rib of the 'Vahlii' 

 group. A third form (var. y) would certainly claim specific rank, but for the 

 intermediate series of a. and /?. The diagnostic characters for the whole se- 

 ries are the smooth operculum, the eight narrow riblets round the base, with 

 angular umbilicus and the sharp, narrow, principal riblets above, with wide 

 interspaces, smooth except from the lines of growth, which are principally 



1865.] 



