BIFIDAHIA. BOYSIDIA. 293 



specimeDS in the British Museum, recently acquired by purchase, 

 which are from Cape Pedro, and are accompanied by a label in 

 the late Edgar Layard's handwriting ; they are in all probability 

 some of the original lot. There are, besides, three shells in the 

 Hungerford collection and eight in the Theobald collection, so 

 that the species appears fairly common. 



203. Bifidaria serrula, Benson. 



Pupa sernda, Benson, A. M. N. H. ser. 3, xii, 1863, p. 427 ; Pfeiffer, 



Mori. Helic. Viv. vi, 1868, p. 319. 

 Pupa (Vertigo (Alaea)} serrula, Pfeiffer & Clessin, Nomencl. Helic. 



Viv. 1881, p. 358. 



Original description : " P. testa rimata, ovato-couica, oblonga, 

 oblique subcostulato-striata, albida ; spira elongato-conica, apice 

 obtuso ; sutura profunda crenulata ; anfractibus 5, superioribus 

 valde convexis, ultimo antice ascendente ; apertura quadrato- 

 ovata, sexdentata, lamina parietali 1 subduplici, columellari 1 

 superiore denteque minuto inferiore, dente minuto basali ; pala- 

 tali 1 superiore laminaque inferiore profunda munita ; peri- 

 stomate undique expanso, marginibus tenuibus callo lato superne 

 junctis. 



"Long. 2, diam. | mill." (Benson.) 



Hab. India : Central India (Theobald). 



Is stated by Pfeiffer to be similar to P. mimula. I have not 

 seen any specimens ; the type, like so many other of Benson's 

 shells, having apparently gone astray. It appears to be a rare 

 species. 



Genus BOYSIDIA, Ancey. 



JBoysidia, Ancey, Le Naturalists, No. 47, 1881, p. 373 (as section 



of Pupa). 

 Gredleriella, Mollendorff, Jahrb. Deuts. Malak. Ges. xi, 1884, p. 179 



(for Pupa hunana). 

 Bemonella, Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, 1900, p. 591, 



footnote. 



TYPE, Pupa dorsata, Ancey. 



Range. India, Farther India, China, Malaysia. 



Shell minute, rimate, conoid, with closely coiled, convex whorls, 

 last whorl ascending in front, dilated towards the aperture, 

 tumid below. Aperture armed with several plicae or lamellae. 

 Peristome continuous. 



Anatomy unknown. 



Ancey, in describing Pupa dorsata, from China, states that it 

 pertains to the Asiatic group of P.plicidens. He proceeds: 

 u Benson found a certain resemblance or rather established a 

 connection between these forms and the species of a certain 

 group (Boysia), equally peculiar to Asia. These Pupas appear 

 to me to constitute a distinct section, which I propose to name 

 Boy&idia, on account of the resemblance to the genus referred to." 



