kuculidyE. 153 



bida, sulcata ; liris ad angulum planulatis ; latere antico (i.e. pos- 

 tico) brevi, subacuminato ; marginibus ventralibus minute crenu- 

 latis. 2^ lin. Straits of Malacca." — In default of a specimen, I 

 am compelled to copy this brief description. 



12. N. sulcata, A. Adams, f. 127. — T. obliqua, subovata, 

 longitudine latitudinem ferme superante, erassa, undique ventri- 

 cosa, cute olivaceo-cinerea hand polita induta, sulcisque inclinatis 

 subarctis undique concentrice insculpta. Extremitas postica inferne 

 rotundato-excisa. Margo ventralis crenatus, arcuatus. Sulci re- 

 gionum dorsalium subobsoleti ; interstitia striolis divaricatis rni- 

 nutis arete ornata. Lunula valde eminens. Nates srepius erosse. 

 — Oblique, somewhat ovate, for the most part longer than broad, 

 very strong, evenly ventricose, clothed with an unpolished oliva- 

 ceous ash-coloured epidermis, grooved throughout ; grooves con- 

 centric, shelving, rather close. Ventral margin more or less 

 arcuated, crenated within, rising behind so as to rotundately cut 

 off the posterior corner. Grooves of the dorsal regions somewhat 

 obsolete ; their intervals densely marked with most minute diver- 

 gent strise ; lunular area much projecting. Beaks usually eroded. 

 — The cartilage-support protrudes greatly, and slants but little. 

 The teeth seem to average about sixteen and ten. Even the dorsal 

 edges are crenulated, yet very delicately. 



13. N. ptjlchra, Hinds, f. 146. — "T. elliptica, solida, sulcata; 

 interstitiis transversim striatis ; marginibus ventralibus crenulatis ; 

 cardine antice {i.e. postice) dentibus 9, postice 27-29. 7 lin." 

 — It is said by Mr. Hinds, from whose works both figure and 

 description have been copied, to resemble the fossil Duchastelii, but 

 to differ by its striated lunule and uninterrupted lamella?. 



14. N. PisrjM, Sowerhj, f. 133. — T. minima, valde ineequila- 

 teralis, satis ventricosa, suboblique obovalis, cute pallide olivacea 

 vix nitida induta, rugis elevatis deusis (quarum interstitia liris 

 minutissimis postice, et nonnunquam antice, sunt decussata) un- 

 dique (nisi ad umbones) concentrice sculpta. Extremitas postica 

 inferne rotundato-excisa. Regiones dorsales striis divaricatis mi- 

 nutissime ornatse. Margo ventralis multum arcuatus, argute 

 creuulatus. Lunula satis prominens, baud definita. — Very small, 

 moderately ventricose, clothed with a rather glossy yet not polished 

 pale or cinereous-olive epidermis, rather obliquely oval. General 

 surface (the umbonal region excepted) densely wrinkled concen- 

 trically ; the corrugations raised, narrower than their intervals, 

 which (under a powerful lens) are, on the shorter side at least, 

 obscurely and finely lyrated across : when highly magnified, too, 



vol. hi. s 



