178 SHELLS OF LOWER CALIFORNIA— STEARNS. vol.xvii. 



"genus Mouoceras, Lam.," in his catalogue and placing Leucozonia as 

 a subgenus tliereundeir. He remarks that " it is a Panama species 

 found by me at the southern extremity of Florida." 



The necessity for calling attention to this unfortunate "muddle" 

 again at this late day, is apparent to any student who has observed 

 how persistently errors of this class find a lodgment in the literature, 

 long after they have been pointed out or exposed. It is well known 

 that neither Leucozonia cingidata nor any representative of the group 

 Monoceros have up to this time been detected on the Atlantic side of 

 the continents, and it is particularly remarkable so far as regards the 

 latter genus. 



LATIRUS CERATIIS, Wood. 



Numerous specimens, living. Tres Marias (ISTo. 47125, U. S. N. M.). 



Many fine examples were detected by Mr. Fisher living in the crevices 

 of the ledges and dead on the beaches. The average dimensions of the 

 Fisher shells is, long. 2.09, lat. 1.44 inches. 



FUSUS DTTPETITHOTTARSII, Kieiier. 



Many specimens. 



La Paz and San Lucas Cove; Loreto (No. 32330,11. S. N. M.); Carmen 

 Island (No. 32334, U. S. N. M.). Of this fine species the examples range 

 from 1.76 to 7.50 inches in length. Compared with specimens of F. 

 multicarinatus from Yokohama, a form regarded by the late Mr. Tryon 

 as the same as F. Beevianus Phil., and which he further suggests as the 

 same as F. Nova-Hollandm Rve., I find the sculpture rather finer and 

 the canal (not a fixed character in the spindle shells) proportionally 

 longer in the Japanese species. Though running very close, the two 

 may be regarded as valid species. In some individuals of the Gulf 

 form the longitudinal ribs whicli extend from suture to suture on the 

 upper whorls become reduced to mere tubercles on the periphery of 

 the two last or larger whorls. 



Fl^'^US AMBUSTU8, Gould. 



Six examples. 



San Lucas Cove (No. 32340, U. S. N. M.). 



Since the publication of Mr. Ball's i)aper* "On the Californian spe- 

 cies of Fusus" and Mr. Tryon's ]\Ionograph,t I have carefully examined 

 the various species included therein that inhabit the region referred to 

 in this paper. Mr. Fisher collected eleven specimens of tlie form now 

 regarded as amhustus. In the various related material before me, I 

 found but little difficulty in segregating these. The two largest meas- 



*Proc. Cal. Acad. Sci., March 19, 1877. 

 t Manual of Couch, vol. iii, pp. 58-64, 



