Bay of Bengal and ihe Arahian Sea. 2r)5 



Mod'iola [Ainyyduliun) arborcsccns (Chemnitz). 



Modiola arboreseem, Chemnitz; Reeve, Conch. Icon. vol. x. fifj. 30; 

 Clessin, Conch. -Cab., Mjtilidae, p. 100, pi. xxix. fig. 10. 



Hab. Station 346, Persian Gulf, 47 fath. {' Investigator ') ; 

 Tasmania and oft' Sydney {Brazier). 



Crenella persica, sp. n. 



Testa parva, irregularitcr ovata, globosa, tenuis, sordide pellucido- 

 albida, liris tenuissimis radiantibus aliisque concentrici.s paulo 

 reuiotis caucellata ; umboucs lajves, incmvati, albi, contigui, 

 terminalcs ; pngina interna nitida, structuram cancellatam exter- 

 nam exliibens, ad margiiiera undique denticulata ; dens cardinis 

 uiiicus, plus minus biHdus in utraque valva ; ligamentum gracile, 

 intra marginem situin. 



Longit. 6 mm., alt. 4-5, diam. 4. 



Hab. Persian Gulf, 47 fath. 



The vtry delicate radiating costellse have a tendency to 

 bifurcate at the outer margin. 



Amnssium caducum, Smith. 



Amussiuin caducum. Smith, Ann. & Mag. Nat. Hist. 1894, vol. xiv. 

 p. 173 ; 189.5, vol. xvi. p. 18 ; 1904, vol. xiv. p. 13. 



Hab. Station 269, W. of Cape Comorin, 464 fath., green 

 mud and sand; Stations 289, 297, Gulf of Oman, 667-811 

 fath. ; Station 322, Andaman Islands, 378 fath. ; Station 327, 

 W. of Burmah, 419 fath. 



Amnssium A/cocki, Smith. 



Amusshun Alcocki, Smith, Ann. & Mag. Nat. Hist. 1894, vol. xiv. 

 p. 172, pi. V. tigs. 15, 16. 



Hab. Station 275, S.W. of Cape Comorin, 731-771 fath. 



Amussium investigatoris, sp. n. 



Testa siibcircularis, compressa, fragilis ; valva dextra albido- 

 pellucida, radiis opaco-albis circiter 10 picta, concentrice regu- 

 lariter et tenuiter striata, intus eostis ad 10 albis medioeriter 

 crassis baud ad marginem attingentibus instructa ; valva sinistra 

 convexior, flavoscens, radiis decern aurautiacis ornata, radiatim 

 tenuiter costulata et concentrice delicate lamellata, lamellis 

 supra costulas squamulatis, intus flavescens, eostis albidis 10 

 tenuioribus munita ; auriculae parvge, subajquales ; umbones 

 acuti, lateribus ad augulum circa 113" convergentibus. 



Longit. 26 mm., alt. 26-5, diam. 5*5. 



