— 417 — 



gularibus, sub lente tantum conspicuis, vestigiisque incrementi 

 sculpta, sub epidermide pallide fusco-lutescente alba; margine 

 dorsali antice fere stricto, postice rotundato, antico extenso 

 cuneiformi, ad extremitatem truncato; umbones in % long. siti, 

 parvi, subprominuli, calyciformes ; lunula distincta, lanceolata, 

 elongata; ligamentum nullum; cartilago obliquus; linea cardi- 

 nalis longa, antice recta, postice leviter curvata ; area cardinalis 

 sat angusta; dentes 4 in utroque latere, externis brevioribus sed 

 fortioribus; latus internum politum, iridescens, ad marginem 

 microscopice crenulatum, impressionibus inconspicuis. — Long. 6, 

 alt. 3 Mm. Jeffreys angl. 



Silicula fragilis Jeffreys Pr. Z. S. 1879 p. 574 T. 45, F. 6 6 a. 

 Hab. in Oceano atlantico (Porcupine Stat. 16, 28). 



5. Genus Limopsis Sassi. 



(Pectunculina d'Orb., Trigonocoelia Nyst). 



T. ovato-rotundata , postice leviter obliqua, epidermide 

 pilosa obtecta, umbonibus crassis prominulis; lunula angusta sed 

 distincta; fovea ligamenti verticalis, subumbonalis ; margo car- 

 dinalis incrassatus, arcuatus, denticulis 4—8 in utroque latere 

 armatus. 



1. Limopsis aurita Brocclii. T. rotundato-ovata, 

 subobliqua, compressa, solida, striis radiantibus et concentricis 

 irregularibus ad intersectionem nodulosis reticulata, postice 

 leviter granulata, porcellaneo-alba , epidermide lutescenti-fusca, 

 ad raarginem late lacerato-producta ; margo dorsalis rectus, 

 utrinque auriforme super umbonem productus, ceteri rotundati ; 

 umbones parvi, acuti, prominuli, regulariter intorti; cartilago 

 parvus sed crassus, foveae triangulari inter apicem et cardinem 

 sitae insertus; cardo dentibus circiter 12 curvatis, oblique dispo- 

 sitis, vix ^l^ ambitus occupans. — Diam. 7—8 Mm. 



Arca aurita Brocchi Couch. foss. subapp. II p. 485 T. 11, F. 9. — 

 (L.) Jeffreys Br. Conch. II p. 161 T. 30, F. 1. — Locard Cat. 

 p. 489. — Jeffreys Pr. Z. S. 1879 p. 585. — Dall Eep. Blake 

 p. 237. 



Hab. in abyssis oceani atlantici et sinus Caribaei. 



2. Limopsis minuta Philippi. T. modice convexa, 

 oblique suborbicularis, vix longior quam altior, postice inferne 

 rotundato-expansa, margine ventralf et antico aequaliter arcuatis, 

 postico oblique ascendente, dorsali utrinque obsolete angulato, 

 umbonibus mediocribus in medio sitis, arca ligamentali anguste 

 rhomboidea; valvulae solidulae, lineis concentricis et radiantibus 

 decussatae, epidermide fusca tectae, pilis longis radiatim dispo- 

 sitis confertim ornatae ; linea cardinalis circa ^l^ long. aequans, 

 denticulis utrinque circiter 6 tubercularibus armata. — Long. 

 12 Mm. Sars. 



Pectunculus minutus Philippi Enum. I p. 63 T. 5, F. 3 (fos.s.). — 



27 



