564 Zoological Society. 



Long. 3'15; lat. ex. var. r05 poll. 



Hab. ad Loay, Ins. Bohol. Mus. Cuming, Sowerby, Stainforth. 



This belongs to the group of which M. Motacilla forms the type. 

 It is an extremely elegant shell ; the caudal canal is gracefully curved 

 and exfoliated. Sandy mud, 7 fathoms. 



MuREx MiNDANAENSis, Couch. Illustr. f. 92. MuT. testd suhcla- 

 vatd, subventricosd, transverse sulcatd, pallide fusco-rufescente ; 

 spird productd, anfractibus octo rotundatis, suturis validis ; caudd 

 elongatd, subrecurvd, exfoliatd : varicibus tribus, validis, rotunda- 

 tis , pone subexcavatis ; ad angulum posticum spind unicd brevi ; 

 deinde spinis quinque brevioribus, parvisque quinque proclivis al- 

 ternantibus : interstitiis tricostatis ; aperturd ovali ; labio externa 

 crenulato, margine dentato ; labio interna Icevi, paulo extante ; ca- 

 nalifere clausa. 

 Long. 3 ; lat. ex. var. '85 ; cauda, \'5. 



Hab. prope Cagayan, provinciae Misamis ad insulam Mindanao 

 Philippinarum. H. Cuming legit. 



This beautiful and very distinct species presents a medium between 

 the groups of which M. Motacilla and M. ternispina may be taken as 

 the types. It was dredged at Cagayan in sandy mud, at a depth of 

 25 fathoms. 



MuREx ELEGANS, Conch. Illustr. f. 84. Mur. testd clavatd, ven- 

 tricosd, rhomboided, Icevi, transverse costatd, albd, costis fusco- 

 lineatis; varicibus tribus, crassis, rarissime subspinosis ; inter- 

 stitiis bituberculatis ; aperturd ovali, labio externa crenulato ; caudd 

 elongatd, recurvd, antice latd, angulatd. 

 Long. 2*15 ; lat. ex. var. 1 poll. 



Hab. ? Mus. H. Cuming. 



A much smoother shell than M, Motacilla, and having two large 

 tubercles between the varices, instead of three. It has been named 

 as above by Dr. Beck in collections, but we believe has never been 

 described. 



MuREx siMiLis, Conch. Illustr. f. 69, 70. Mur. testd subfusifor- 

 mi, subventricosd, transverse interrupta-costatd, pallide fulvd, 

 transverse bifasciatd vel interrupto lineatd : varicibus tribus, cos- 

 tatis ; ad angulum anfractuum und spind brevi, deinde quatuor ad 

 quinque anterioribus minimis, ad caudam und spind brevi ; inter- 

 stitiis trifaridm noduloso-costatis : caudd recurvd longiusculd pos- 

 tice latd, angulatd exfoliatd ; aperturd ovali ; labia extante, intus 

 leviter crenulato; labro crenulato. 



Long. 1-90; lat. '8. 



Hab. } Mus. Saul. 



The spire is much more elongated, the varices more spinose and 

 less thickened, and the caudal canal less elevated than in M. Mota- 

 cilla, which, in general characters, it much resembles. 



MuREX scABROSus, Couch. Illustr, f. 73. Mur. testd subturbinatd, 

 ventricosd, crassd, carrugatd, transverse lineis elevatis, scabrosis, 

 distantibus, costatd, pallide fulvd, fusco -maculatd ; spird brevi, 

 obtusd, anfractibus sex ventricosis, suturis validis ; caudd langi- 



