4 DR. P. V. CARPENTER ON THE SHELLS OF PANAMA. 



33. Oliva araneosa = 0. melchersi, M. 591. Prof. Adams's shanty- 

 specimen can scarcely be distinguished from that which he marked 

 " 0. literata, Alabama." But the ordinary aspect of the shells O. 

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

 the Southern States, and 0. melchersi from the Pacific, is sufficiently 

 distinct (for the genus). 



34. Oliva inconspicua, C. B. Ad. = Olivella i., M. 599. Some of 

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

 St. Lucas graduate into the Caribbean 0. oryza ; others^into dwarf 

 forms of O. gracilis. The species either needs revision from fresh 

 specimens, or should be merged into O. gracilis. 



35. Oliva pellucida, C. B. Ad. Dead specimen ; differs from 

 Olivella p.. Eve. 



36. Oliva porphyria. Stet. 



37. Oliva semistriaf a = Olivella s. Closely resembles O. colu- 

 mellaris. 



38. Oliva testacea^Agaronia t., M. 602. 



39. Oliva undatella — Olivella u., M. 595. 



40. Oliva venulata. This shanty specimen is 0. angulata, jun. 

 The 0. venulata, M. 593, is named by Prof. Adams O julietta, as 

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

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



41. Oliva volutella=: 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. tergina 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. dama {=lineolata, Gray, C. B. Ad.), abundant at Mazatlan, was 

 bought, not collected, by the Professor at Panama. 



42 Planaxis planicostata. Stet. Also immensely common at 

 Panama, though absent from Mazatlan. 



43. Nassa 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. Stek. 



46. Nassa gemmulosa=M.. 631, exactly. 



47. Stet. 



48. Nassa luteostoma=M. 623. 



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



50. Nassa pagodus, C. B. Ad. {-\-N. canescens, P. ■\^)=-^N. 

 {Ipagodus, var.) acuta, M. 625. It is certainly the N. decussata 

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

 dus of Rve. 1 am still unable to say, the type being apparently lost. 

 We are bound to suppose that iMv. Reeve could not mistake 'so de- 



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