Dn. p. p. C VIIPENTER ON TtlK SHELLS OF PANAMA. ■> 



ciJcd a Xas\(i tor ci Triton ; so that if I^amiirck's is a similar Easle '\ 

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



al. Xassa panamensis, C. B. Ad. The Professor ri!;htly mar'.v.'.l 

 his dupHcates "exilis, Pws." This al)undaiit sliell, haviiiu a Pisa- 

 noid, not a Nassoid opercnhim, ))robal)ly belongs to P/tos, Xurthio, 

 or some genus not yet ehnifnated. A'. oLsuleta, Say, has a similar 

 operculum, and appears nearly related. 



52. Xassa proximo. The unicjue specimen appears to be an ex- 

 treme form ot A', versicolor, P. .55. 



53. Xassa 1 scabriuscula, C. B. Ad. (non P\vs.) = A^. complauata, 

 Pws. : V. P. 56. 



54. X^'assa 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 Xassa. The specimens in Mus. Cuming., 

 h jwever, from another source, ditlcr somewhat in the nucleus from 

 the small form of X. versicolor. These = A. yjrtw^tfra, Gld., teste 

 Cuming, and should take that name. 



55. Xassa versicolor, C. B. Ad., M. (i.'32. 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 \ary much more among themselves than the ex- 

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

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

 sible that the uuique crebristriata, M. (333, is also an extreme variety. 



56. X'assa wilsoni appears to be only a dwarf form of P. 53, 

 N. complanata. 



57. Buccinttm crassum=Phos c. 



58. Buccimim distortum^=Clavella d. 



59. Buccinum i)isiffne= Pisajiia i., M. 659. 



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

 on his card " J/M/-e.r ? ? " ; then '■' FususV ; then ^' Fusus noUu- 

 losus. Ad., n. s."; then " Buccinum {'.} Iiii/ubre, Ad., n. s."; so that 

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

 may rank with Pisania. 



6 1 . Buccinum pagodns = Pisania p. 



62. Buccinum pristis = Xorthia serrata, 



63. Buccinum rinyens= Pisania r., M. 6G3. 



64. Buccinum san(/uinolentum= Pisania s., M. 662. 



65. Buccinum stimpsonianum=Xassa st. 



66. Dolium ringens=Malea r. 



67. Monoceros brevidentatnm. This species, very common at 

 Prt'iama, has been transported over (nut tiiron^Iij the Pacitic, to Suu 

 Fraucisco and Mo.ueiey . v. P pige 75. 



179 



