168 



anis, rufescentibus eburneo lineatis ; extremitate postica leviter 

 truneata demum subsinuata ; declivitate umbonali obtuso : cardo satis 

 validus ; dentibus lateralibus duobus. Long. 10 ; alt. 9 ; lat. 6 millim. 

 Inhabits Loo Choo. W. S. 



Very like T. perula Gd, and possibly the same. It is less pouched, 

 and destitute of concentric lamellar strias and the two peculiar 

 white umbonal rays, though there are vermicular opaque markings. 



Tellina (Arcopagia) cratitia. T. tenuis, Uvida, compressa, 

 ovato-triangularis, costis acutis reclivantibus ad 30 (minoribus postice 

 interpositis) radiata, et laminis crebris concentricis reflexis costas equi- 

 tantibus cancellata ; umbonibus medianis ; marginibus dorsaHbus 

 declivibus, subrectis ; extremitate postica acute rotundata, et plica 

 inconspicua, umbonali instruct;! ; margine ventrali arcuata, pectinata ; 

 cavositas nitida, sulculata. Long. 15; alt. 11; lat. 5 millim. In- 

 habits Loo Choo, sandy bottom, 8 fathoms. W. S. 



Analogous to T. scobinata, but no species has been described with 

 similar sculpture, which is much like that of Venus marica. 



Lutraria lucida. T. tenuis, alba, oblongo-ovata, subfalcata, 

 concentrice undulata ; umbonibus ad trientem anteriorem positis, 

 acutis, eminentibus ; extremitate antica acute rotundata, margine 

 dorsali declivi ; marg. postica concava, compressa, extremitate trun- 

 eata ; declivitate umbonali obtusa ; cavositate porcellana ; cardine 

 debili. Long. 40 ; alt. 20 ; lat. 8 millim. Inhabits Kagosima. W. S. 



Remarkable for its thin, lucid, fragile structure. A specimen in 

 Mr. Cuming's Coll. is larger than those collected by the Expedition. 



Saxidomus aratus. T. crassa, exalbida, ovato-quadrata, epider- 

 mide tenui rufa induta, liris profundis recliventibus concentricis arata ; 

 umbonibus ad trientem anteriorem positis ; extremitate postica sub- 

 quadrata, oblique truneata, angulis rotundatis, modice hiante ; delivi- 

 tate umbonali obtuso ; extrem. antica minus elevata, rotundata, absque 

 lunula : cavositas alba, margine simplici : cardo validus, dentibus in 

 utraque valva 4, in v. dextra posteriori, in v. sinistra anteriori multo 

 majori. Long. 4.5 ; alt. 3 ; lat. 2 inches. Inhabits San Francisco. 



Smaller than S. Nuttalli, the posterior dorsal portion more elevated, 

 the valve more regularly convex, the beaks less prominent, which 

 with the furrows and epidermis give it very distinct characters. 

 Venus maxima Phil, cannot be very different from it. 



Tapes vernicosa. T. solida, oblongo-ovata, ventricosa, nitida, 

 superne levis alibi concentrice sulcato-plicata, fulva flavido maculata 

 et radiis hepaticis interruptis 4 ornata ; umbonibus vix antemedianis ; 

 lunula lanceolate ; facie dorsali antica excavata ; extremitate antica 

 acute rotundata ; margine dorsali postica subrecta, extremitate late 

 rotundata, subtruncatii ; marg. ventrali lente arcuata ; margine 

 interna simplici. Long. 3 ; alt. 2 ; lat. 1.5 poll. Inhabits Kagosima 

 Bay and off Hakodadi Cape, in coarse sand, 20 fathoms. W. S. 



