370 ZOOLOGY. 



which in his specimen was relied upon by Mr. Redfield as a good means of distinguishing his 

 species from Triton cancellatum of Lamark. Dr. Gould, from the notes of Mr. Couthou_y and 

 Dr. Pickering, has described the animal of each, the one collected at the Straits of Magellan 

 and the other at Puget Sound, considering them entirely distinct. 



Reeve, and Dr. Gould after him, quote Jay as the author of the species, and original 

 describer in the annals of the Lyceum of New York. Middendorff and Carpenter call the 

 author Say. The credit is really due to Mr. J. H. Redfield, as above cited. 



CHRYSODOMUS ANTIQUUS. 



Chrysodomus anliquus, Swainson ? Tarpenter, Eep. p. 343. 

 Marex anliquus, LiNN. Syst. Nat. ed. 12, L Gmel. eci. 13. 

 Fmm antqjiiis. Lam. in. saus vert, ed. 2, IX, p. 447. 

 Tnlonium {Fu.ms) auliquum, MiDD. Malacol. Ross. II, p. 131. 

 Tiit. (Fus ) antiquvm, yax. Behringiana, MiDD. Reise, II, 224, pi. x, f. 3. 

 [l„l) — Straits of Juau de Fuca ; Dr. Suckley. Behring's i-traits ; Middendorff. 



But one specimen of this sj^ecies was obtained, which agrees with the variety from Behring's 

 straits represented by Middendorff in his Reise, though showing still less carination on the 

 penultimate whorl. The figures of his "varietates Behringianaj," in the "Beitrage," rejire- 

 sent a different but allied variety. 



CHRYSODOMUS MIDDENDORFII, n. s. 



Trilonium (Films) decemcoslalum, Midd (nee. Say) Beitrage, II, p. 138, p!. iv, fig. 15, (the sculpture only.) — Carp. 

 Rep. p. 217. Omitted in his Gen. Catalogue, p 343. 



Hab. — Straits of Juan de Fuca ; Dr. J. G. Cooper. Kodialc, Kenai ; Middendorff. 



DESt'KiPTiox. — Shell light horn color, the rihs darker, within wliite, tinged witli violet ; solid, ventricose-fusiform, the 

 whorls convex, planulate on the upper part, encircled with strong well marlied and elevated ribs, three to four on the 

 whorls of the spire, ten to twelve on tlie las-t whorl, soma near the canal less distinct, with intervening stiiae, which are 

 more distinct forward ; canal somewhat curved, equalling in length about two-thirds the breadth of the aperture. Length, 

 2.G inches; breadth, 1.5 ; length of aperture, 1.7 inch. 



This species is strikingly different from Fusiis decemcosfatns, Say, in the convexity of all the 

 whorls, as well as in the angle formed in the outer lip by the termination of the first rib. The 

 upper part of the last whorl is planidate, meeting the whorl above nearly at a right angle, 

 while in the eastern species the same part is broadly excavated, rising steeply towards the 

 suture. In the latter the penultimate and smaller whorls are made concave by the excavation 

 l^etween the two ribs which they generally exhibit, while the new species shows four on the 

 penultimate and three on the smaller whorls. In F. decemcostalus the first rib is stronger and 

 more prominent than those below it, while in the new species it is less so. Philippi's figure 

 of Say's shell represents a variety, and not the normal state of the species. Our specimen of 

 the new species is furnished with twelve more or less distinct ribs. The eastern shell, (from 

 the examination of one hundred and thirty specimens,) appears to have seldom more than 

 seven to eight, rarely nine ribs. 



Fusiis spitzhergensis, Reeve, (in Belcher's Arctic Voyage, II, p. 395, pi. 32, f. 6, a. b.,) is an 

 allied, but, judging from the figure and description of Mr. Reeve, a very different species. 



A single specimen collected by Dr. Cooper on the shore of Whidby's island, in the Straits of 

 Fuca, with that described by Middendorff, are all at present known of this interesting species, 

 first pointed out to me by Dr. Gould as the F. decemcostatus of Middendorff'. 



