72 PKOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



22. Plectopylis (Sykesia) ' clatheatula, var. compeessa, n.var. 



PL V, Figs. 13, 14. 



Shell narrower and more elevated than the type, spire more convex ; 

 umbilicus narrower, the last whorl being more convex at the base, and 

 the descent into the umbilicus more abrupt ; sculpture much as in the 

 type, but the lower of the two conspicuous keels lies more in the 

 suture ; armature similar to the type, but the palatal denticles are 

 more regular and horizontal. Alt. 2-4, diam. 5 mm. 



Sab. — Ambagamuwa (0. CoUett). 



At first sight the raised ribs appear to be absent, but traces appear 

 under a microscope ; this may be due to the condition of the specimens. 

 A typical specimen measures alt. 2*7, diam. 6'1 mm. A glance at the 

 figure will show the difference in form. I have to thank Mr. Gude 

 for kindly examining this species and the next. 



23. Plectopylis (Sykesia) calighstosa, n.sp. PL V, Figs. 21, 22. 



Testa mediocriter umbilicata, lenticularis, acute carinata, superne 

 costulis obscuris remotis ornata, parum nitens, comeo-brunnea, apice 

 magno, obtuso ; sutura bene impressa, anfr. 5, plano-convexi, lente 

 accrescentes, ultimus basi inflatus, radiato-striatus ; apertura verti- 

 calis, angusta, angulato-lunaris ; peristoma simplex, acutum ; plicae 

 et dentes sicut (?) in P. clathratula, sed dentes palatales pauci. 

 Alt. 2-9, diam. 6 mm. 



Sah. — Ambagamuwa (0. Collett). 



Shell slightly more elevated than P. clathratula, whorls a little 

 flatter, base more inflated, the umbilicus being little more than half 

 the size, colour more brown ; the spiral lirse are absent, save for 

 a faint trace above the suture of a single one, and the costse almost 

 obsolete ; the armature appears to be very similar, savQ that the 

 palatal denticles are only three or four in number. 



24. Thysanota(?) efmita, n.sp. PL Y, Pigs. 17, 18. 



Testa depresso-conica, anguste umbilicata, corneo-virescens, dej)resso- 

 trochiformis, apice obtusulo ; sutura impressa ; anfr. 5-5^, plano- 

 convexi, linea unica spiralis supersuturalis muniti, transversim 

 subtiliter striati, sub lente undique spiraliter striati, ultimus carinatus, 

 carina suturaque pilis elongatis ciliatis ornata, basi subinflatus ; 

 apertura angulato-lunaris ; peristoma simplex, rectum. Alt. 2, 

 diam. 4*2 mm. 



Hah. — Ambagamuwa (0. Collett) ; Badulla (0. Collett), a variety. 



A very interesting little species, of which I have seen a good 

 number of examples. It recalls the young of Tliysanota Guerini, Pfr., 

 but is more trochiform and not so convex. It appeared possible that 

 it might be the young of Plectopylis clathratula, or an allied species ; 



1 Mr. Glide recently proposed the name Aicstenia (Science Gossip, voL iii, 

 pp. 300, 332) for a new section of Flectopylis, having P. clathratula, Pfr., as its 

 type, but finding that name preoccupied, he substituted Sykesia for it. 



