362 Mr, Broderip and Mr. G. B. Sowerby on some 



The epidermis of this species is very thin. In Mr. Sowerby's collec- 

 tion. 



SOLEN ALTUS. 



S. testd albido-carned, subovatd, altd, antice rotundatd, postich elon- 

 gatd, epidermide fused, extra marginem extensd ; long. 4-f%, lat. 

 -9- alf 2-2- i)nU 

 Hah. in Oceano Arctico. 



Towards the middle of each valve there are some slight radiations, 

 vyhich are visible through the strong epidermis. There are also corruga- 

 tions of the epidermis which appear to be the effect of drying. 



Tellina Burneti. 

 Tab. IX, Fig. 2. 



T. testd trigond, margine inferiore rotundatd, incBquivalvi, lateribus 

 serratis, antico falcato ; umbonibus acutis ; valvis concentrice 

 striatis, alterd planiusculd, alterd subconvexd; long. \\, alt. \^, 

 lat. -i?g, poll. 

 Hab. ad Mazatlan, in ^stuario. 



Shell triangular, with the lower margin rounded, and slightly flexuous 

 towards the posterior margin ; the valves are unequal, one being a little 

 depressed, especially towards the umbo, but so Httle as to be nearly flat, 

 and the other slightly convex, and they are rough with close-set, raised, 

 concentric lines. The margins of both sides are serrated, and, between 

 them, when the valves are shut, there is a deep sinus, the bottom of which 

 is formed by the well-closed edges. The posterior margins are nearly 

 straight ; the anterior margins are sickle-shaped. The colour of the 

 lower half of the shell is of a dead or opaline white, and the upper 

 part is slightly tinged with yellow. The texture is delicate, and the shell 

 is translucent. 



Found in the Estuary of Mazatlan, among the shoals of large Pinnae 

 which are left dry at low water. The Pinnae lie so thick as to form a 

 stratum above the sand, and are very injurious to boats that ground upon 

 them, cutting like a sharp instrument. 



Young specimens of Fusus Morio were found within dead Pinnae at the 

 same place. 



