346 WKST AMERICAN MOLM^SKS STKAHNS. 



CouiiiKMiciiiii' witli {\w upper part of tlic \ arices, is \\w iniiicipal 

 tioiul and this is (li\ idcd ov bilid, or wr may say it is coinposcd of 

 two fronds unitinij" and forniiuji' one, tlu' main frond; tluMi conu's a li'ap, 

 followed by throe fronds, then another uap followed by two fronds, and 

 this system of oni', three, and two is exhibited nsnalls in eaeli of the 

 three varices of the body whorl. 



Chicoieus Leeaiuis Dall. 

 Proc. U. S. Nat. Musoiun, vol. xii.. ^k :V29-XW, 1889. 



Two examples of this rare and strikinji* species were brought to my 

 attention when in San l)iej?o, in :\Iay, 1S«)2, by Miss J. N. Cooke. The 

 larger measnred DO, the smaller To millimeters in length. They were 

 both collected by Capt. (J. 1>. INnter. The tirst was found living- be- 

 tween tide marks in sand, one in San Ignacio lagoon, Lower California; 

 the other was a beach shell. Dall's type was dredged olf Cerros Island, 

 Lower California, in 44 fathoms muddy bottom by the U. S. Fish Com- 

 mission steamer Albatross, in ISSS. It measured 70 millinH'ters. 



(ienus OCINEBRA Lca.li. 

 Ocinebra lugubris Shy. 



Mitrex liitjuhris Sby. Proc. Ztxil. Soc. Loiulou, ISSl', ]>. 17r>. Coiu'Ij. Illu.s., Fij;. '26. 



Reeve, loonica, 8|>., 143. 

 Afurex erhiaeeoidcs YakMicieniies. Ki'iiu-il (rohscrvatioiis, etc., ii, 302, 1833. 

 Miirtx valifornicHii Hinds. Proi'. ZocU. S(»c. London, 1813, p. 128. Voyage Snl- 



phur, t. 3, i)i>. i), 10. 

 Murer callfornicit,'} Reeve. Conch. Iconica. Sp.. 144. 

 Mio-cr {Ocitiebra) crhiaccoiden A^al. (= f }f. cari/oniicu^ Hinds) Stearns. Proc. 



Aead. Nat. Sciences, Phila., 1878, ])p. 30;"), 31)6. 



Collected by Mr. W. J. I'^isher at La Pa/, Lower California, in 1S07 

 (Mus. No. 40767). 



In the late Dr. Carpenter's reports to the British association (lS.-)0 

 and 180;>) reference is made to .}fi(rici(U'(t rrhiaceoith's by name oidy. 



In his Mazatlan catalogue, however, he has described a "var. inilcn- 

 iata,^'' of a form which he i>resumes to be Valenciennes's species, and 

 suggests a comparison with Kiener's Mnrex alveatus. In the Smith- 

 sonian checklist, June, 18(iO, he included Kiener's name, but omitted 

 that of Valenciennes. The ^'■nlveatufi^'' of Kiener is a quite distinct 

 form, not at all like 1iif/i(bris. 



The form under review came to my notice many years ago ami its 

 determination sorely puzzled others as well as myself. About the same 

 times numerous examides of the I'^uiopean .1/. «fiiittcci(s were received 

 from various sources an«l from several localities, from the liritish Coast 

 to the Mediterranean shores of southern Europe. The close resem- 

 blance of the West American to certain examples of the European form 

 at once attracted my attention and jylaced nu' on the right track to 

 identitication. 



The propriety of \'alencienn«\s's nanu' was evident from the material 



