NUCULIDjE. 



49 



bida, sulcata ; liris ad angulum plaiiulatis ; latere antico [i.e. pos- 

 tico) brevi, subacuminato ; marginibus ventrabbus minute crenii- 

 latis. 2i \\n. 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 ferrae superante, crassa, undique ventri- 

 cosa, cute olivaceo-cinereu baud polita induta, sulcisque inclinatis 

 subarctis undique concentricc insculpta. Extremitas postica inferne 

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

 gionum dorsalium subobsoleti ; interstitia striolis divaricatis mi- 

 nutis arete ornata. Lunula valde eminens. Nates s?cpius erosre. 

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

 very strong, evenly ventricose, clothed with an unpobshed 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 strife ; 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 dehcately. 



13. N. PTJLCHRA, Hinds, f. 146. — "T. eUiptica, solida, sulcata; 

 iuterstitiis transversim striatis ; marginibus ventrabbus crenulatis ; 

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

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

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

 to differ by its striated lunule and uninterrupted lamellae. 



14. N. pisuM, Sowerhi/, f. 133. — T. minima, valde insequila- 

 terahs, satis ventricosa, suboblique obovalis, cute pallidc olivaceii, 

 vix uitidu induta, rugis elevatis deusis (quarnm interstitia liris 

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

 dique (nisi ad umbones) concentrice sculpta. Extremitas postica 

 inferne rotundato-excisa. Eegiones dorsales striis divaricatis mi- 

 nutissime ornatse. Margo ventralis multum arcuatus, argute 

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

 moderately ventricose, clothed with a rather glossy yet not pobshed 

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

 surface (the umbonal region excepted) densely wrinkled concen- 

 trically ; the corrugations raised, narrower than tlieir intervals, 

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

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



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