4 r)R. p. p. CARPENTER ON THE SHELLS OF PANAMA. 



33. Oliva aruneosft = 0. mtichersi, M. 591. Prof. Adams's shanty 

 spGcimeii can scarcely be distiiijiiiished from that wliich he marked 

 " O. literato, Alabama." But the ordinary aspect of the shells O. 

 reticuhnis from the Caribbean Islands, O. literata from the coast of 

 the Southern States, and O. melchersi from the Pacific, is suthcieutly 

 distinct (tor the genus). 



34. OHva inconspicva, C. B. k(\. = 0lireJ1a i., M.*.t9Q. Some of 

 the shells referred to this species from Panama, Mazatlan, and Cape 

 St. Lucas graduate into the Caribbean O. ori/za ; others^iuto dwarf 

 ibrms of O. </racHis. The species either needs revision from fresh 

 specimens, or should be merged into O. gracilis. 



35. Oliva pellucida, C. B. Ad. Dead sj)ecimen ; differs from 

 Olivella p.. Eve. 



36. Oliva porphyria. Stet. 



37. Oliva semistriata^= Olivella s. Closely resembles O. colu- 

 niellaris. 



38. Oliva testacea-= Agaronia t,, M. 602. 



39. Oliva undatella — Olivella «., M. 59.'>. 



^0. Oliva venulata. This shanty specimen is O. angulata, jun. 

 The O. venulata, M. 593, is named by Prof. Adams O jutietta, as 

 also by Mke. (non Duel.). The true O.julietta (Guacomayo, Mus. 

 Smiths.) is the Pacific "analogue" of O.fusifonuis. 



A 1. Olira v olid ell a =^ Olivella v. It is surprising that this species, 

 so immensely common at Panama and up the coast, should not reach 

 the Gulf, and that the equally common O. terginn of Mazatlan and 

 O. gracilis of Cape St. Lucas and Acapulco should be rare elsewhere, 

 while the larger Olives are found from Guaymas to the equator. 

 O. llama {=^lineolata, Gray, C. B. Ad.), abundant at Mazatlan, was 

 bought, not collected, by the Professor at Panama. 



42 Planaxis planicosfata. Stet. Also immensely common at 

 Panama, though absent trom Mazatlan. 



43. A^assa canescens, C. B. Ad. Having compared this unique 

 specimen with P. 50, q. v., I can speak to their complete identity. 

 The "pale grey" of the "interspaces" is due to the shell being 

 dead. 



44, 45. Stent. 



46. Nassa gemm7(losa = M. 631, exactly. 



47. Stet. 



48. Nassa lufeostoma = M. 623. 



49. Nassa nodi/era. Also found at Guaymas. 



50. Nassa pagodus, C. B. Ad. ( + A^. canescens, P. 45) =« y. 

 (? nagodus, var.) acuta, M. 625. It is certainly the N. decussata 

 ol Kien., but probably not of Lam. Whether it is the Triton pago- 

 dus cf Rve. I am still unable to say, the type being apparently lost. 

 "VVe are bound to suppose that Mr. Reeve could not mistake so de- 



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