On new Species of Mollusca. 233 



common lobster, is probably a thelycum or receptaculum semim's. 



It resembles that of the lobster * in genera] form, but differs a 

 little in the two species. In Th. zaleucus the posterior unpaired 

 lobe (no doubt the " triangular pectoral plate " of Willemoes- 

 Suhm's account) is relatively large and its anterior angle is 

 acute, while the anterior paired lobes are depressed in the 

 middle line ; in Th.japonicus the posterior lobe is smaller, its 

 anterior angle is obtuse, and the anterior lobes are elevated 

 in the middle. It is possible, however, that these differences 

 may not be specific, but may be due to differing decrees of 

 maturity, ° 



XXVIII.— Descriptions of new Species of Mollusca 

 By G. B. Sowerby, F.L.S. 



[Plate III.] 



The eight Japanese species described in this paper, together 

 with the six appearing in my last (Ann. & Mag. Nat. "Hist. 

 June 1913), were collected and sent over by Mr. Y. Hirase' 

 whose diligent researches have added much to our kuowledo-e 

 of the moiluscan fauna of Japan. He has also recentTy 

 built and furnished an excellent conchological museum at 

 Kyoto. 



Qlyphosloma glabriplicatum, sp. n. (PI. III. fig. l.) 



Testa elongata, albida, solidiuscula ; spira elato-turrita ; anfraotua 9 

 convexi, gradati, spiraliter subtilissime striati, iongitudinaliter 

 plieati ; plicis 8, crassiusculi3, rotundatis, glabratis ; anfractus 

 ultimus brevis, infra contractus, luwirostratus; apertura brevi- 

 culaj peristoma ad marginem acutmn, extus crassivaricosura 

 intus phcatum ; sinus posticus arcuatus, mediocritcr profundus' 

 latiusculus; columella rectiuscula, leviter plicata ; canalis brevis' 

 infra expansus. 

 Long. 14, niaj. diam. 4 mm. 



I lab. Osumi, Japan. 



Shell with a short body-whorl and high turrited spire- 

 the outer lip thickened by a strong varix, edge acute, interior 

 of the aperture on both sides closely plicate. 



In its general aspect this shell is very like G. alicice 



* Caiman, "Crustacea," Lankester's' Treatise on Zooloffv.' 1909 n -"ti 

 fig. 169. "■' ' l '- 1 ' 



Ann tD Mag. X. Hist. Ser. 8. Vol. xu. lb 



