198 



these four whales were of one species. Certainly the Nybster wliale 

 was not Physalus antiquorum, therefore P. antiąuorum is not alone 

 ia exceeding 60 feet in lengtb, a dimension supposed to be confined 

 to that species. 



The fin-wliales of Orkney and Caithness, every season observed in 

 pursuit of herrings, would seem in all probability to be of the species 

 of which you bave received portions. They are not P. boops, for 

 three out of four specimens captured (and the fourth was not killed) 

 agree with each other, and differ from P. boops in the upper and 

 lower lateral processes of the second cervical vertebra being nnited, 

 lea\-ing a subcentral foramen. 



They will no doubt prove to be of a new species, though unex- 

 amined individuals may have doubtless come ashore in Orkney over 

 and over again. 



3. Descriptions of Shells from the Gulf of California, 

 AND THE Pacific Coasts of Mexico and California. 

 Part II. By a. a. Gotjld, M. D., and Philip P. Car- 



PENTER. 



Dr. Gould, the well-known author of the Rep. Invert. Mass. and 

 the U. S. Exp. Shells, having most obligingly sent over the ■ffhole of 

 his collections from the Pacific shores of N. America, in order to 

 fumish materials for my Report to the British Association, there have 

 appeared among them several shells not to be identified with re- 

 corded species. Of some of these Dr. Gould enclosed names and 

 diagnoses. For the remainder of the follovdng paper I am alone 

 responsible. Most of the new species in this coUection ■were de- 

 scribed by Dr. Gould in the Proceedings of the Boston N. H. So- 

 ciety ; and have been published in a separate form with three platės. 

 I have therefore regarded this communication as a supplement to 

 that paper, and have adopted the šame title. The references apply 

 to it, unless otherwise expressed. 



P. P. C. 



Bristol, June21st, 1856. 



1. Pholadidea ovoidea, Gould. 



Pholas ovoidea, Mex. & Gal. Shells, pt. I. p. 15. pi. 15. f. 1. 

 Hab. San Diego (Lieut. Green). Mus. Gould. 



2. Petricola robusta, Sow. 



Petricola bulbosa, Gould, p. 16. pi. 15. f. 5 ; B. M. Mazatlan 

 Cat. p. 17. no. 24. 



3. Corbula polychroma, n. s. 



V. t. ffibbosa, transversa, solidu; postice angidata, carinulis 

 duabus, altern ad marginėm ventndem, altera juxta cicatr. 

 muse. adeuntibus ; siib superficiem externam concentrice suka- 



