Ob ZONITIDJE. 



striation beneath ; spire low, apex obtuse ; whorls 6, convex, slowly 

 increasing, the last rounded at the periphery, rather flatly convex 

 beneath ; aperture slightly oblique, lunate ; peristome thin, basal 

 margin a little arcuate, columellar slightly expanded, more broadly 

 near the perforation, which is partly covered. 



Major diam. 14 J, min. 13, axis 7 mm. 



Hob. South-western Ceylon ; Khambodde. Matelle East (Nevill, 

 Layard} ; Bolegalle, near Kandy (//. F. B.) ; Katnapura, Gampola, 

 Nuwara Eliya (H. Nevill}. From Arnbagamua (0. Collett). 



[The animal (tig. 30 A, p. 52) has the left dorsal lobe divided into 

 a large anterior and a small elongate narrow posterior portion. 

 The lower main sheath of the male organ is very short from the 

 generative aperture upwards ; it then diminishes in section and is 

 folded into a large loop confined by a strong broad muscle. Near 

 the return portion of the free loop is a short stout portion, the 

 diverticulum or caecum, to which the retractor muscle is attached ; 

 near the same place is the short kale-sac which the vas deferens 

 joins. A very remarkable set of finger-like processes occur here 

 (fig. 30 A), marking the place of formation of the spermatophore 

 of peculiar form (fig. 30 C). The radula formula is 



72 . 1 . 13 . 1 . 13 . 1 . 72 



86 . 1 . 86 



The laterals are long, curved, and bicuspid, the outer cusp 

 considerably below the points of the inner.] 



There has been some confusion between this and E. subopaca, 

 and it is difficult to determine the types, though the original 

 descriptions are perfectly clear. E. partita is a thinner, less 

 globose shell than E. subopaca, with less strong and less regular 

 sculpture, and of a different colour. //. subconoidea was founded 

 on immature specimens of E. partita. 



A variety with the spire almost or quite flat, and the last whorl 

 subangulate above the periphery, occurs amongst specimens from 

 Katnapura and Nuwara Eliya in Mr. H. Nevill's collection. 



100. Euplecta trimeni, Jousseaume (Euplectella), Mem. Soc. ZooL 

 France, vii, 1894, p. 276, pi. 4, fig. 5. 



Shell narrowly perforate, conoidly depressed, thin, fragile, 

 subpellucid, obliquely costulate above, radiately striated beneath, 

 pale olivaceous fulvous ; spire low, conoid, suture impressed ; 

 whorls 5|, slightly convex, the last depressedly rounded, scarcely 

 descending ; aperture oblique, lunate ; peristome simple, straight, 

 thin, sharp, columellar margin slightly thickened, reflected and 

 appressed at the perforation, the margins joined by a thin callus. 



Major diam. 10, min. 9, axis 7 mm. 



Hab. Nuwara Eliya, Ceylon. 



Judging from the above description, translated from the original, 

 the single specimen to which the name was given may have been 

 a small thin shell of E. subopaca, perhaps immature. 



