1863. I DR. p. p. CARPENTER ON THE SHELLS OF PANAMA. 343 



cided a Nassa for a Triton ; so that if Lamarck's is a similar Eastern 

 species, the West American may stand as iV. acuta. 



51. Nassa panamensis, C. B. Ad. The Professor rightly marked 

 his duplicates " exilis, Pws." This abundant shell, having a Pisa- 

 noid, not a Nassoid operculum, probably belongs to Phos, Northia, 

 or some genus not yet eliminated. N. obsoleta, Say, has a similar 

 operculum, and appears nearly related. 



52. Nassa proxima. The unique specimen appears to be an ex- 

 treme form of iV. versicolor, P. 55. 



53. Nassa ? scabriuscula, C. B. Ad. (non Pws.) =iN^. complanata, 

 Pws. : V. P. 56. 



54. Nassa striata, C. B. Ad. The two type specimens, one young, 

 the other adult, both belong to a variety of versicolor. The phrase, 

 " last whorl spirally canaliculate on the left side," simply expresses 

 the ordinary character of Nassa. The specimens in Mus. Cuming., 

 however, from another source, differ somewhat in the nucleus from 

 the small form of N. versicolor. These = N. pauper a, Gld., teste 

 Cuming, and should take that name. 



55. Nassa versicolor, C. B. Ad., M. 632. The revolving striae 

 vary so greatly in this species, as well as the size, obesity, and, colour, 

 that it is hard to assign its limits. The specimens marked versicolor 

 by the Professor vary much more among themselves than the ex- 

 treme ones do from his proxima and striata. The apex and early 

 whorls of each are exactly the same under the microscope. It is pos- 

 sible that the unique crebristriata, M. 633, is also an extreme variety. 



56. Nassa wilsoni appears to be only a dwarf form of P. 53, 

 N. complanata. 



57. Buccinum crassum=Phos c. 



58. Buccinum distortum=Clavella d. 



59. Buccinum insi(/ne=Pisania i., M. 659. 



60. Buccinum lugubre, C. B. Ad. The Professor marked this shell 

 on his card " Mwrea; ? ? " ; then " FususX" ; then " Fusus nodu- 

 losus, Ad., n. s."; then "Buccinum (?) lugubre. Ad., n. s."; so that 

 the old genera were sometimes as badly defined as the new ones. It 

 may rank with Pisania. 



61. Buccinum paffodus= Pisania p. 



62. Buccinum pristis= Northia serrata. 



63. Buccinum ringens= Pisania r., M. 663. 



64. Buccinum sanguinolentum=^ Pisania s., M. 662. 



65. Buccinum stimpsonianum= Nassa st. 



66. Dolium ringens=Malea r. 



67. Monoceros brevidentatum. This species, very common at 

 Panama, has been transported over (not through) the Pacific, to San 

 Francisco and Monterey : v. P. page 75. 



