from the Persian Gulf, &c. 139 



Alectryon (Phrontis) alchnus*, sp. n. (PI. IV. fig. 2.) 



A. testa ovato-fusiformi, solida, alba, brunneo-liueata et hie illic 

 variegata ; anfractibus 8, quorum tres miuuti, apicales, vitrei, 

 lawes, caeteris ad suturas gradatulis, lougitudinaliter crassi- 

 costatis, et spiraliter sulcatis, sulcis anfractum apud ultimura 

 circa 12, costis infra, juxta suturas, nodulosis, spiraliter brunneo- 

 zonatis, et maculato-lineatis ; apertura ovata, labro incrassato, 

 albo, laevi, paullum effuso, intus multilirato ; coluuiella callosa, 

 alba, nitida, excavata. 



Long. 15, lat. 8 mm. 



Hub. Mekran Coast. 



This very select species may be a local variety of Nassa 

 nodicostata, H. Adams, but differs from specimens in my 

 collection so named by Mr. F. P. Marrat. It evidently 

 comes nearest this species, but appears smoother than the 

 Philippine Island type collected by Mr. H. Cuming and 

 figured by Reeve. There has been some confusion between 

 this shell and the similarly named Nassa nodicincta, Adams. 

 This is an entirely different species, of the Western Hemi- 

 sphere, though equally nodose below the sutures of the 

 various whorls. I have it from the Galapagos Isles. 



Alectryon (Hima) gwatkinianus, sp. n. 

 (PI. IV. fig. 4.) 



A. testa ovata, cinerea, circa aperturam brunneo-tincta ; an- 

 fractibus 8, quorum 3 apicales subhyalini, fusci, ceteris apud 

 suturas impressis, ventricosulis, spiraliter arete noduloso-liratis, 

 et longitudinaliter decussato-costulatis, costulis obliquis, inter- 

 stitiis planatis, quadratis ; apertura fere rotunda, labro effuso, 

 intus multilirato, columella multum excavata, versus basin trun- 

 catula, canali lato brevissimo. 



Long. 20, lat. 11 mm. 



Hab. Persian Gulf. 



This interesting " ]S T assa" is the Eastern analogue of the 

 Californian perpinguis, Hinds, which in most ways it very 

 closely resembles. It is, however, of slightly thicker sub- 

 stance and the columella more strongly excavate. A chestnut 

 spiral band, ornamenting the whorls, likewise exists in the 

 American species, but is absent in ours. Having received 

 this shell from the late Rev. Professor Henry Melvill Gwatkin, 

 as received by him direct from Mr. Townsend, I have pleasure 

 in connecting with it the name of a friend of long standing, and 



* aXici/tos, stoutly-fashioned, strong. 



10* 



