MELVILL : GASTROPODA FROM THE PERSIAN GULF, ETC. 159 



covering the umbilical region, which is excavate, thrice spirally Urate, 

 decussate and crenulate at the points of junction of the longitudinal 

 lirce, beyond these spiral lirations the base is scratched with what may 

 be incremental lines of growth, the rest of the surface is white, 

 smooth, and shining. Allied to C. sulcatum, Watson,^ from Pernambuco, 

 675 fathoms. 



Cyclostrema eupoietum,^ n.sp. PI. X, Fig. 2. 



C. testa parva, compacta, alba, solidula, obtecte umbilicata, parum 

 nitente, anfractibus 4, apicali parvo, simplice, subhyalino, caeteris, 

 praecipue penultimo atque ultimo spiraliter arctissime lirato-sulcatis, 

 penultimi liris sub lente fortiter punctatis, ultimo ad basim circa 

 umbilicum crenellifero, crenellis magnis, paucis, apertura rotunda, 

 peristomate tenui, continuo, umbilicum fere obtegente. Alt. 1, diam. 

 1-2 mm., sp. min. ; alt. I'S, diam. 2mm., sp. max. 



Several examples of a small, narrowly umbilicate shell, four- 

 whorled, the two last being very closely spirally lirately furrowed, the 

 penultimate minutely puncto- striate. The crenellations round the 

 half-covered umbilicus are large in proportion to the size of the shell. 

 Mouth round, peristome continuous, hardly thickened, a tongue- 

 shaped process, lirato-sulcate as is the rest of the surface, extending 

 over the umbilical region. In the absence of the operculum and soft 

 parts this species seems best included in Cyclostrema, Marryat, a genus 

 that badly needs revision, but, speaking on conchological grounds 

 alone, it appears allied to certain Lnptothyrce in several particulars. 



Ethalia jucunda, n.sp. PL X, Figs. 3, ?>a. 



E. testa rainuta, depressa, alba, nitida, imprimis perforata, deinde 

 callifero, callo magnopere umbilicum obtegente, anfractibus 4, apicali 

 parvo, vitreo, ultimo rapide accrescente, ad peripheriam rotundato, 

 omnibus nitidis, laevissimis, apertura ovato-rotunda, peristomate intus 

 maxime incrassato. 



Var. carinulata, n.var. 



Testa ut supra, sed undique spiraliter ante striatula, ad peripheriam 

 ssepius subangulato, basi circa umbilicum paullum excavata. Alt. '75, 

 diam. l*75mm., sp. maj. 



An exceedingly small, but particularly interesting Ethalia, its 

 nearest allies being E. reclusa, Dall, E. diaphana {WOvh.), and perhups 

 E. suppressa, Dall,^ the first and the last of these having been obtained 

 during the "Blake" Expedition. It is not among the common species in 

 the above locality ; I have, indeed, only seen about a dozen examples, 

 and amongst them the var. carinulata predominated. The smooth form, 

 which I have considered most typical, however, is slightly larger, and 

 decidedly adult. Here no striation is perceptible with aid of the very 



1 Cf. Report "Challenger" Expedition, vol. xv, p. 121, pi. viii, figs. Wa-c. 

 - euTTOtrjTOS, well-formed. 



3 Bull. Mus. Comp. Zool. Haivaid Coll., xxix, pt. 2, pp. 361, 3G2, pi. xxviii, 

 figs. 7, 8. 



