from the Persian Gulf, &c. 147 



Eissoina, d'Orb., 1840. 



§ Chiliostigma, subgen. nov. 



Rissoina refugium, sp. d. (PI. V. fig. 20.) 



R. testa isosceliformi, supra attenuata, alba, nitida, solidula ; an- 

 fractibus ad 11, apicalibus loevibus, nitentibus, caeteris suturaliter 

 imi)ressis, ventricosulis, uudique arete et minute longitudinaliter 

 striato-liratis, striis paullum obliquis, interstitiis regulariter et 

 arctissime spiraliter puncturatis, punctis minutis, ultimo anfractu 

 infra peripheriam curto, abbreviato ; peristomate albo, incrassato, 

 la3vi, subtriangulari, paullum effuso, fere continuo, ad basin 

 compresso, crassiore ; columella obliqua, apertura subovata. 



Long. 12, lat. 1 mm. 



Uah. Gulf of Oman, lat. 21° 50' N., long. 5G° 54' E. ; 

 156 fathoms. 



A remarkable species, which seems worthy of separate 

 subgeneric rank, corning, it is true, near certain members of 

 subgen. Zebina or Zebinella, but differing in the close longi- 

 tudinal striation and interstitial close spiral pitting, the 

 puncturatrons being very regular and minute. From these 

 circumstances I propose the subgenus Chiliostigma * '. 



The nearest approach I can find in this large genus to our 

 species is E. mottezi, Bavay f, from Jamaica, very recently 

 described. I have only seen figure and description. It is 

 more decidedly costulate, but the deep spiral pitting is 

 represented, and I would consider it to belong to the same 

 new subgenus. 



Amphithalamus psomus J, sp. n. (PI. V. fig. 19.) 



A. testa minuta, oblonga, solidula, fusca ; anfractibus 5, quorum 

 apicalis minutus, cseteris arctissime spiraliter striatis, ultimo 

 paullum elongato ; apertura subrotunda ; peristomate fere con- 

 tinuo, loete fuscescente, nitido, paullum expanso ; columella 

 simplice. 



Long. 3-25, lat. 1*75 mm. 



Hah. Mekran Coast, near Gwadilr. 



A very small, dark brown shell, with slightly expanded and 

 reflected lip, very closely microscopically spirally striate 

 throughout. It has several allies in this region — columen % 



* x^'os, ffTiyna, thousand-pitted. 



t Journ. de Conch. 1917, p. 107, pi. iii. fig. 15. 



| i^wjuos, a morsel or tit- bit. 



